GATEFIELD CORP
8-K, 1997-11-14
ELECTRONIC COMPUTERS
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<PAGE>


                   UNITED STATES SECURITIES AND EXCHANGE COMMISSION
                                WASHINGTON, D.C. 20549


                                       FORM 8-K


                                    CURRENT REPORT

        Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934


                  Date of Report (Date of earliest event reported):
                         November 14, 1997 (October 22, 1997)



                                  GATEFIELD CORPORATION
                                  ---------------------
                 (Exact name of registrant as specified in its charter)


                            Commission file number 0-13244


DELAWARE                                                              41-1404495
(State or other jurisdiction of                               (I. R. S. Employer
incorporation or organization)                               Identification No.)
                                           
                                           
47100 BAYSIDE PARKWAY, FREMONT, CALIFORNIA                                 94538
(Address of principal executive offices)                              (Zip Code)
                                           
                                           
        Registrant's telephone number, including area code:  (510) 623-4400 
                                                       
                                           
                                           
                                           
                                           
                                           
                                           
                                           
                                  ZYCAD CORPORATION
                                  -----------------
          (Former name or former address, if changed since last report)
                                           

<PAGE>
ITEM 5. OTHER EVENTS

Strategic Partnership with Siemens Aktiengesellschaft

In a joint press release on November 3, 1997, GateField Corporation (the 
Company) (OTC: GATE) and Siemens Aktiengesellschaft (Siemens Semiconductor or 
Siemens) announced that they have engaged in a long-term strategic 
partnership that they believe will provide revolutionary solutions to satisfy 
future system level integration and programmable logic device customer needs. 
 In a first step, Siemens has licensed GateField's non-volatile and 
reprogrammable ProASIC-TM- technology to be embedded into their system level 
integration (SLI) products.  Siemens agreed to pay the Company $3,250,000 for 
the technology license, for 500,000 shares of GateField common stock and for 
a five (5) year stock warrant to purchase up to 9.9% of the issued and 
outstanding shares of common stock at an exercise price of 80% of market 
price on the date of exercise with a minimum exercise price of $1.00, subject 
to stockholder approval. Information contained in the November 3, 1997 press 
release further describes the terms of the long-term strategic partnership 
and is incorporated by reference to Exhibit 20.04 of this report.

Stock Purchase Agreement

A two-phase, private placement agreement was signed on November 10, 1997 
between GateField Corporation (the Company) and Idanta Partners, Ltd. 
(Idanta).  Under the terms of the agreement, Idanta will purchase 1,000,000 
shares of the Company's Series B Convertible Preferred Stock, par value 
$0.10, for an aggregate purchase price of $4,582,500.  At Idanta's 
discretion, each share of Preferred Stock is convertible into 4.5825 shares 
of the Company's Common Stock. In addition, Idanta is required under the 
Stock Purchase Agreement to purchase 4,582,500 shares of the Company's Common 
Stock for an aggregate purchase price of $4,582,500, pending stockholder 
approval of management proposals at the Company's 1997 Annual Meeting of 
Stockholders to be held on December 15, 1997. In the event the stockholders 
do not approve the proposals at the 1997 Annual Meeting of Stockholders, 
Idanta will have a warrant to purchase 1,000,000 shares of common stock at 
$1.00 per share.  Information contained in the November 14, 1997 press 
release further describes the terms of this Stock Purchase Agreement and is 
incorporated by reference to Exhibit 20.05 of this report.


                                       1
<PAGE>
ITEM 7. FINANCIAL STATEMENTS, PRO FORMA FINANCIAL INFORMATION AND EXHIBITS

        (a)  Financial Statements of Business Acquired

             Not applicable.

        (b)  Pro Forma Financial Information

             (1)  GateField Corporation pro forma condensed income statement
                  (unaudited) for the nine months ended September 30, 1997
                  (see page 4).

             (2)  GateField Corporation pro forma condensed balance sheet
                  (unaudited) at September 30, 1997 (see page 4).


        (c)  Exhibits

             10.29  License Agreement dated October 22, 1997 between GateField
                    Corporation and Siemens Aktiengesellschaft

             10.30  Stock Purchase Agreement dated November 10, 1997 between
                    GateField Corporation, Idanta Partners, Ltd., The Dunn 
                    Family Trust and The Perscilla Faily Trust incorporated 
                    by reference to Annex B of the Preliminary Proxy 
                    Statement for the 1997 Annual Meeting of Stockholders 
                    filed November 12, 1997.

             20.04  GateField Corporation press release dated November 3, 1997,
                    regarding the long-term strategic partnership with Siemens 
                    Aktiengesellschaft

             20.05  GateField Corporation press release dated November 14, 1997,
                    regarding funding from Idanta Partners, Ltd.

                                       2
<PAGE>

SIGNATURE


Pursuant to the requirements of the Securities Exchange Act of 1934, the 
registrant has duly caused this report to be signed on its behalf by the 
undersigned thereunto duly authorized.

                         GATEFIELD CORPORATION



                         BY  /s/ Stephen A. Flory 
                             --------------------
                             Stephen A. Flory
                             Vice President and Chief Financial Officer

November 14, 1997

                                       3
<PAGE>

           PRO FORMA CONDENSED CONSOLIDATED STATEMENT OF OPERATIONS
                   (in thousands, except per share amounts)
                                 (unaudited)

<TABLE>
<CAPTION>

                                                                          Effects of strategic      Effects of         Pro forma
                                                       9 months ended      partnership formed     agreement with    9 months ended
                                                        Sep 30, 1997          with Siemens            Idanta         Sep 30, 1997
<S>                                                   <C>                  <C>                    <C>               <C>
Revenues                                                 $  12,317             $   1,500            $     -           $  13,817

Cost of Revenues                                            10,962                   -                    -              10,962
                                                         ---------             ---------            ---------         ---------
  Gross profit                                               1,355                 1,500                  -               2,855

Total operating expenses                                    16,192                   -                    -              16,192
                                                         ---------             ---------            ---------         ---------
Operating gain (loss)                                      (14,837)                1,500                  -             (13,337)
                                                         ---------             ---------            ---------         ---------
Other income (expense)

  Interest expense                                            (867)                  -                    -                (867)

  Other income (expense)                                     3,874                   -                    -               3,874
                                                         ---------             ---------            ---------         ---------
    Total other income (expense)                             3,007                   -                    -               3,007
                                                         ---------             ---------            ---------         ---------
Net income (loss)                                        $ (11,830)            $   1,500            $     -           $ (10,330)
                                                         ---------             ---------            ---------         ---------
Net loss per share                                                                                                    $   (0.36)
                                                                                                                      ---------
Weighted average common shares                                                                                           28,460
                                                                                                                      ---------

                PRO FORMA CONDENSED CONSOLIDATED BALANCE SHEET
                                (in thousands)
                                 (unaudited)

ASSETS

Current assets

  Cash and cash equivalents                              $   2,201             $     -              $   4,583         $   6,784

  Accounts receivable, net                                   4,774                 3,250                                  8,024

  Inventories, net                                           1,050                   -                    -               1,050

  Other current assets                                         462                   -                    -                 462
                                                         ---------             ---------            ---------         ---------
    Total current assets                                     8,487                 3,250                4,583            16,320

Property and equipment, net                                  2,945                   -                    -               2,945

Other assets                                                   333                   -                    -                 333
                                                         ---------             ---------            ---------         ---------
    Total assets                                         $  11,765             $   3,250            $   4,583         $  19,598
                                                         ---------             ---------            ---------         ---------
LIABILITIES & STOCKHOLDERS' EQUITY

Current liabilities

  Current portion of long-term obligations               $     475             $     -              $     -           $     475

  Accounts payable                                           4,180                   -                    -               4,180

  Accrued expenses                                           4,551                   -                    -               4,551

  Deferred revenues                                          1,840                 1,750                  -               3,590
                                                         ---------             ---------            ---------         ---------
    Total current liabilities                               11,046                 1,750                  -              12,796

Long-term obligations                                          241                   -                    -                 241

Convertible debenture notes                                      0                   -                    -                 -
                                                         ---------             ---------            ---------         ---------
    Total liabilities                                       11,287                 1,750                  -              13,037

Stockholders' equity                                           478                 1,500                4,583             6,561
                                                         ---------             ---------            ---------         ---------
    Total liabilities and stockholders' equity           $  11,765             $   3,250            $   4,583         $  19,598
                                                         ---------             ---------            ---------         ---------

</TABLE>

                                       4



<PAGE>
                                                        EXHIBIT 10.29


                                  LICENSE AGREEMENT
                                           
                                       BETWEEN
                                           

                   GateField Corporation, Fremont, California, USA

                      - hereinafter referred to as "GATEFIELD" -

                                         AND

               Siemens Aktiengesellschaft, Berlin and Munchen, Germany

                       - hereinafter referred to as "Siemens" -
                                           
    - GateField and Siemens hereinafter referred to as the "Parties" -

PREAMBLE

WHEREAS,  GateField has developed a technology for field programmable
semiconductor products based on flash technology:

WHEREAS, Siemens is engaged in the development, production, commercialization
and worldwide marketing of semiconductor products;

WHEREAS,  Siemens wishes to acquire certain rights and licenses under
GateField's technology:

NOW THEREFORE, the Parties agree as follows:

ARTICLE 1 - DEFINITIONS

For the purpose of this Agreement, the terms set forth in this Article 1 are
defined to mean the following:

1.1  "Documentation":  The Know-how in recorded form (e.g. on paper or other
     data carriers) including but not limited to the documents listed in Annex
     1 hereto.

1.2  "Equipment":  Hardware systems as listed in Annex 1 hereto.

1.3  "GateField Standard ProASIC Products":  Standard programmable ASIC
     (ProASIC) product, defined and developed by GateField, based on
     GateField's proprietary switch and architecture.

1.4  "Improvements":  All improvements and/or modifications of the Know-how
     and the Software Tools, which GateField develops and/or acquires
     ownership of during the term of this Agreement.


License Agreement GateField/Siemens                                         1

<PAGE>

1.5  "Know how":  Methods, techniques, process flows, designs. architectures,
     structures, specifications for Equipment, design methodologies, circuits,
     techniques to prepare masks, design models and test programs related to
     GateField's Field Programmable Gate Array (FPGA) technology and which may
     be transferred by GateField without restriction.

1.6  "Patents":  All patents, patent applications, utility models, mask works
     and design patents related to GateField's FPGA technology and which may
     be transferred by GateField without restriction.

1.7  "Software Tools":  Software programs owned by GateField in source and
     object code form as listed in Annex 1 hereto.

1.8  "Subsidiary":  A corporation, company or other entity
     
     -   where more than fifty percent (50%) of whose outstanding shares or
         securities (representing the right to vote for the election of
         directors or other managing authority) are, now or hereafter, owned or
         controlled, directly or indirectly, by a Party hereto, or

     -   which does not have outstanding shares or securities, as may be the
         case in a partnership, joint venture or unincorporated association,
         but more than fifty percent (50%) of whose ownership interest
         representing the right to make the decisions for such corporation,
         company or other entity is, now or hereafter, owned or controlled,
         directly or indirectly, by a Party hereto.

1.9  "Technology Integration Services":  Technical services to be rendered by
     GateField in order to adapt and integrate (i) its ProASIC technology to
     Siemens' standard 0.25micron CMOS Flash process and process flow (ii) the
     Software Tools to work within Siemens' design environment.

1.10 "Updated Documentation":  The Improvements in recorded form (e.g. on
     paper or other date carriers).

ARTICLE 2 - SUPPLY OF DOCUMENTATION, SOFTWARE AND EQUIPMENT

2. 1 GateField shall supply Siemens with the Documentation and the Software
     Tools within 30 days following the Effective Date.  If the Know-how is
     not entirely documented at Effective Date, GateField shall promptly
     complete the Documentation and deliver such completed Documentation to
     Siemens.

2.2  During the term of this Agreement, GateField shall currently inform
     Siemens on GateField's Improvements and supply Siemens with the Updated
     Documentation without undue delay.

2.3  GateField shall supply Siemens with the Equipment within 30 days
     following the Effective Date.

2.4  GateField is prepared to sell Equipment upon fair and reasonable
     conditions to the customers of Siemens and its Subsidiaries.


License Agreement GateField/Siemens                                         2


<PAGE>

ARTICLE 3 - TECHNOLOGY INTEGRATION SERVICES

3.1  GateField shall perform Technology Integration Services according to the
     contents and time schedule of Annex 1.

3.2  Siemens will without undue delay provide GateField with technical
     information Siemens deems necessary for GateField to develop GateField
     Standard ProASIC Products manufactured at Siemens' fabs and for the
     performance of Technology Integration Services by GateField.  GateField's
     use of such technical information is restricted to the performance of the
     above mentioned purpose.

ARTICLE 4 - RIGHTS AND LICENSES

GateField hereby grants to Siemens and its Subsidiaries the unlimited,
worldwide, non-transferable and non-exclusive right and license to freely use,
but not to sublicense, the Know-how, Improvements, Software, Patents,
Documentation and Updated Documentation in any way they see fit, except for
GateField Standard ProASIC Products.
                                           
ARTICLE 5 - STOCK TRANSFER AND STOCK WARRANT

5.1  In consideration for the payments to be made by Siemens under Article 6
     GateField shall transfer upon Siemens' request and without further
     payment of Siemens 500,000 shares of its common stock to Siemens. 
     Siemens may request this transfer of stock within a term of three years
     from Effective Date upon serving written notice to GateField.

5.2  GateField grants to Siemens a stock warrant for the purchase of 9.9 % of
     its outstanding shares of GateField's common stock at Effective Date for
     an exercise price equal to 80 % of the Market Price of GateField's common
     stock on the trading day immediately prior to the date of exercise,
     subject to a minimum exercise price of 1.00 $ per share.  Market Price is
     defined as the last trade price for common stock as reported by Nasdaq. 
     This stock warrant is subject to approval of GateField's stockholders at
     their May 1998 annual meeting.  In the event that Siemens interest is
     decreased to less than 9.9 % by future equity offerings,  Siemens will
     have the right to increase the stock warrant for additional shares at the
     same conditions as the equity offering such that Siemens would be able to
     maintain its 9.9 % interest in GateField.  Siemens may exercise this
     stock warrant within a term of five years from Effective Date upon
     serving written notice to GateField. The stock warrant may be exercised
     at the earliest as follows: For the first 1/3 of the shares after 6
     months from Effective Date: for an additional 1/3 after 12 months from
     Effective Date; and for the final 1/3 after 18 months from Effective
     Date.

ARTICLE 6 - CONSIDERATION

In consideration for the supply of the Equipment, Documentation and Updated
Documentation under Article 2, the performance of Technology Integration
Services under Article 3.1, the rights and licenses 


License Agreement GateField/Siemens                                         3

<PAGE>

granted under Articles 4, the shares offered to Siemens under Article 5.1, as 
well as the stock warrant granted under Article 5.2 Siemens shall pay to 
GateField an amount of $ 3.250.000 (in words: US dollars three million two 
hundred and fifty thousand) in three installments of:

- -    an amount of 1.500.000 $ (in words: one million five hundred thousand US
     dollars) within 30 days following Effective Date; and

- -    an amount of 1.000.000 $ (in words: one million US dollars) within 30
     days following delivery of the Equipment, Documentation and Software
     Tools to Siemens; and

- -    an amount of 750.000 $ (in words: seven hundred and fifty thousand US
     dollars ) within 30 days following the completion of the Technical
     Integration Services.

The value of the license to use the Software Tools for purposes of this
Agreement is 250.000 $ (in words: two hundred and fifty thousand US dollars)


ARTICLE 7 - TAXES

7.1  Any and all taxes, charges and/or other duties (hereinafter "Taxes")
     imposed on GateField with respect to any payments to be made by Siemens
     to GateField under Article 6 of this Agreement, shall be borne and paid
     by GateField.  If required by the laws of Germany, Siemens may deduct
     Taxes imposed in Germany on GateField with respect to such payments from
     the payments and pay such Taxes, on behalf of GateField.  To the extent
     Siemens has so deducted and paid Taxes on behalf of GateField, Siemens
     shall, if so requested by GateField, submit to GateField official tax
     receipts issued by the German tax authorities and evidencing the payment
     by Siemens of Taxes in Germany on behalf of GateField.

7.2  To the extent the Double Taxation Convention between Germany and the
     United States of America entities GateField to claim a reduction of or an
     exemption from Taxes imposed on and to be paid by GateField according to
     the laws of Germany, Siemens shall use reasonable efforts to support
     GateField in obtaining a tax reduction/exemption certificate (or the
     like) from the German tax authorities, if so required by the
     aforementioned Double Taxation Convention and/or German tax law to
     validate the aforementioned claim for tax reduction/exemption.  As long
     as Siemens has not received copy of such tax reduction/exemption
     certificate from GateField, the regulations of Section 7.1 shall apply.

ARTICLE 8 - FUTURE COOPERATION AND SILICON FOUNDRY AGREEMENT

     The Parties intend to extend their technical cooperation and to conclude
     a silicon foundry agreement as outlined in the Letter of Intent concluded
     at on July 17, 1997.


License Agreement GateField/Siemens                                         4

<PAGE>

ARTICLE 9 - EMERGENCY MANUFACTURING RIGHT

     In case that GateField discontinues the manufacture of GateField Standard
     ProASIC Products and Equipment or does not fulfill its delivery
     obligations within 60 days after receipt of written notice of default. 
     Siemens may claim that GateField (i) makes available free of charge the
     technical information of GateField (including software programs)
     necessary to manufacture and test Equipment, (ii) enables Siemens to
     manufacture and test Equipment in Siemens' own facilities or to have it
     manufactured and/or tested and (iii) grants Siemens the necessary user/
     utilization rights under the technical information and intellectual
     property rights of GateField which are owned by GateField including the
     right to grant sub-licenses to third parties ("Emergency Manufacturing
     Right").

ARTICLE 10 - WARRANTY AND LIABILITY

10.1 GateField shall correct at its own cost all errors of the Software Tools,
     Documentation and Updated Documentation without undue delay after receipt
     of a written notice by Siemens specifying the error and thereafter shall
     supply Siemens with a corrected version of the deficient Software tools, 
     Documentation and/or Updated Documentation within a commercially
     reasonable time consistent with standard release practices.

10.2 GateField represents and warrants:

     -   that it is not aware that the use of the licensed Know-how and
         Software Tools by Siemens does infringe any third party's
         intellectual property rights;

     -   that the Equipment supplied hereunder is free from defects in material
         and workmanship and that it will repair or replace all deficient
         Equipment without undue delay pursuant to GateField Terms and
         Conditions of Sale, a copy of which is attached to this Agreement 
         as Annex 2.

10.3 Neither Party shall be held liable by the other Party for any indirect,
     incidental or consequential damages including loss of profit and/or loss
     of savings, regardless whether the claim is based on breach of contract,
     breach of warranty, tort or any other cause of action.  This shall not
     apply in cases of gross negligence and intent.

ARTICLE 11 - CONFIDENTIALITY

11.1 The Parties undertake to keep secret - even after termination of this
     Agreement - with respect to third Parties except its Subsidiaries any
     information furnished hereunder, which is marked "Confidential" or
     similarly legended (hereinafter all together referred to as "Confidential
     Information") and to use the same degree of care to avoid disclosure to
     any third Party as the Parties use with respect to their own information
     of like importance which is to be kept confidential.  The Parties shall
     limit internal access to such information to its and its Subsidiaries'
     officers or employees who have a need to know such information for the
     purpose of this 



License Agreement GateField/Siemens                                         5


<PAGE>

     Agreement.

11.2 The Parties further agree that they will only use the Confidential
     Information supplied under this Agreement for the purposes set forth in
     this Agreement.

11.3 Prior to disclosure of any Confidential Information to their officers or
     employees, the Parties shall inform them of their duties of
     confidentiality and if there does not exist a written general
     confidentiality agreement (e.g. as part of the employment agreement)
     shall obtain from such persons written confidentiality commitments in
     terms no loss onerous than Sections 11.1 and 11.2 above.

11.4 The obligation as per Section 11.1 above shall not apply to any
     information which:

     a)  is already in the public domain or becomes available to the public
         through no breach of this Agreement by a Party;

     b)  was rightfully in the receiving Party's possession without obligation
         of confidentiality prior to receipt from the disclosing Party as
         proven by the written records of the receiving Party;

     c)  can he proved to have been rightfully received by the receiving Party
         from a third Party without obligation of confidentiality;

     d)  is hereafter independently developed by the receiving Party as proved
         by its written records;

     e)  is required to be disclosed in order to comply with a judicial order
         or degree.

11.5 This Section 11 shall survive any expiration of this Agreement for a
     period of 5 years.

ARTICLE 12 - EFFECTIVE DATE, TERM, TERMINATION

12.1 This Agreement shall enter into force after being signed by both Parties
     hereto (Effective Date).  The Parties agree to review this Agreement by
     June 30th 1999 for the purposes of extending it for a longer period of
     time.

12.2 This Agreement shall continue in effect until December 31, 2000.

12.3 Articles 3, 4, 5, 9, 10, 11, 13, 14 shall survive the expiration of this
     Agreement.

ARTICLE 13 - ARBITRATION

13.1 All disputes arising out of or in connection with this Agreement or from
     agreements regarding its performance including any question regarding
     their existence, validity or termination, shall be settled under the
     Rules of Arbitration of the International Chamber of Commerce, Paris
     (Rules) by 


License Agreement GateField/Siemens                                         6


<PAGE>

     three arbitrators appointed in accordance with the said Rules.

13.2 The place of arbitration shall be Geneva, Switzerland.  The procedural
     law of this place shall apply, where the Rules are silent.

13.3 The language to be used in the arbitration proceeding shall be English.


ARTICLE 14 - APPLICABLE LAW

All disputes shall be settled in accordance with the provisions of this
Agreement and all other agreements regarding its performance, otherwise in
accordance with the substantive law in force in Switzerland, without reference
to its conflict of laws provisions.


ARTICLE 15 - MISCELLANEOUS
      
15.1 This Agreement cannot be modified except by written instrument signed by
     both Parties.  This requirement of written form can only be waived in
     writing.

15.2 Communications between GateField and Siemens shall be given by mail or
     facsimile, to the following addresses of the Parties:


     If to GateField to:               If to Siemens to:
     -------------------               -----------------

     GateField Corporation             Siemens Aktiengesellschaft
     47100 Bayside Parkway             Semiconductor Group
     Fremont, CA 94538                 Dr. Franz Neppl
     USA                               Balanstrasse 73
     Attention: Dr. James R. Fiebiger  I)-81671 Munchen
     Fax 510-623-4575                  fax:  *49-89-63625600


15.3 No right or interest in this Agreement shall be assigned or transferred
     to any third party by either Siemens or GateField without first obtaining
     written consent from the other Party, which consent shall not be
     unreasonably withheld.

15.4 If any provision contained in this Agreement is or becomes ineffective or
     is held to be invalid by a competent authority or court having final
     jurisdiction thereover, all other provisions of this Agreement shall
     remain in full force and effect and there shall be substituted for the
     said invalid provision a valid provision having an economic effect as
     similar as possible to the original provision.


License Agreement GateField/Siemens                                         7

<PAGE>

15.5 This Agreement constitutes the entire understanding and agreement between
     the Parties hereto with respect to the subject matter hereof and shall
     supersede and cancel all previous agreements, negotiations and
     commitments, either oral or written, relating hereto.




IN WITNESS WHEREOF, THE PARTIES HERETO HAVE CAUSED THIS AGREEMENT TO BE EXECUTED
IN DUPLICATE BY THEIR RESPECTIVE DULY AUTHORIZED REPRESENTATIVES:



DATE:                                   DATE:  
     ------------------------------          ----------------------------




- -----------------------------------     ---------------------------------
SIEMENS AKTIENGESELLSCHAFT              GATEFIELD CORPORATION




License Agreement GateField/Siemens                                         8


<PAGE>

ANNEX 1

1.   GATEFIELD DELIVERABLES

- -    Technology information for Siemens C6F-1 Process 

     Layout, netlist, special runsets and simulation results for

     - switch
     - cell
     - architecture
     - circuits/circuit design

     demonstration/examples of the above for existing technologies (0.5micron m)
     Process flow

- -    Libraries

     - Datasheet/books for 0.5micron, 0.6micron drawn (or 0.35micron m version)
       with timing information
     - Available application notes
     - Synopsys 3.5a (or newer version)
     - Vital Library for VSS
     - Verilog Library

- -    ASICMaster

     - Tools (incl. documentation) for netlist optimization
     - Tools (incl. documentation) for placement and routing
     - Tools for timing extraction in conjunction with other logic blocks
     - Tools/methodology for master generation/chip design

- -    ASICmaker

     - 6 consoles (hardware) for device programming for serial ports
     - Tool kit/software for programming

- -    Testing

     - Methodology/Hardware for "low cost" testing
     - Tool/methodology for test pattern generation before and after
       programming

- -    GateField FPGAs


License Agreement GateField/Siemens                                         9


<PAGE>

     - different FPGAs samples (5 each) for all GateField Standard ProASIC
       Products currently released for production in different sizes in a 
       0.5micron m (0.6 micron drawn) (or smaller)

- -    Support

     - Local application support (10 man month technology support;
                                  8 man month circuit implementation support).

2.   TECHNOLOGY INTEGRATION SERVICES

GateField will dedicate key engineers to help accelerate the implementation of
GateField's ProASIC technology into Siemens' 0.25u CMOS Flash process
development.  For this purpose, GateField will

- - make engineers available at Siemens process development site 
- - provide test chip / test structure databases 
- - design and provide a memory 
- - contribute with device analysis and measurement 
- - provide the results of testing the memory chip 
- - provide the results of failure analysis on the memory chip 
- - provide any other useful test results

GateField will make the necessary adaptations to provide a seamless integration
into Siemens process technology as well as Siemens design and development
environment.  The following areas will be addressed:

- - call design
- - architecture
  chip design
- - design and programming software technology
- - test technology and infrastructure
- - compatibility with Siemens system tools

  - common technology files
  - common layer definitions
  - common schematic definitions

- - compatibility with Siemens system design schema

  - compatible layer usage
  - compatible power bussing


License Agreement GateField/Siemens                                         10


<PAGE>

- - compatibility with Siemens system design tool

  - languages
  - simulation libraries
  - EDA tools



License Agreement GateField/Siemens                                         11




<PAGE>
                                                                  EXHIBIT 10.30
 
                            STOCK PURCHASE AGREEMENT
 
    This Stock Purchase Agreement (the "Agreement") dated as of November 10,
1997, is entered into by and among GateField Corporation, a Delaware corporation
with offices at 47100 Bayside Parkway, Fremont, California 94538 (the
"Company"), and the entities listed on Exhibit A hereto (the "Purchasers"), in
connection with the purchase of (i) 1,000,000 shares of the Company's Series B
Convertible Preferred Stock, par value $.10 (the "Preferred Stock"), convertible
into up to 6,110,000 shares of the Company's common stock, $.10 par value (the
"Common Stock"), to be sold to the Purchasers at the First Closing (as defined
below), (ii) Common Stock Purchase Warrants in the form attached hereto as
Exhibit B, to purchase an aggregate of 997,751 shares of Common Stock at a
purchase price of $1.00 per share (collectively, the "Warrants"), to be sold to
the Purchasers at the First Closing (as defined below), and (iii) 4,582,500
shares of Common Stock to be sold to the Purchasers at the Second Closing (as
defined below). The shares of Common Stock issuable upon conversion of the
Preferred Stock, the shares of Common Stock issuable upon exercise of the
Warrants, and the Common Stock sold to the Purchasers at the Second Closing are
collectively referred to herein as the "Shares". The Certificate of Designation
setting forth the rights, restrictions, privileges and preferences of the
Preferred Stock (the "Certificate of Designation") is attached hereto as Exhibit
C. The solicitation of this Agreement and the offer and sale of the Preferred
Stock, the Warrants and the Shares, are being made in reliance upon the
provisions of Regulation D ("Regulation D") promulgated by the Securities and
Exchange Commission ("SEC") under the United States Securities Act of 1933, as
amended (the "Securities Act") or upon the provisions of Section 4(2) of the
Securities Act. The Preferred Stock, the Warrants and the Shares are sometimes
collectively referred to herein as the "Securities." The Common Stock issuable
upon conversion of the Preferred Stock and the Common Stock issuable upon
exercise of the Warrants are sometimes collectively referred to herein as the
"Underlying Stock."
 
    In consideration of the mutual promises, representations, warranties and
conditions set forth herein, and intending to be legally bounded hereby, the
Company and the Purchasers agree as follows:
 
1. PURCHASE AND SALE OF SECURITIES; CLOSING CONDITIONS
 
    1.1  PURCHASE AND SALE OF SECURITIES.
 
        (a)  PURCHASE OF PREFERRED STOCK AND THE WARRANTS.  Each of the
    Purchasers hereby agrees to purchase and the Company agrees to sell to each
    of the Purchasers (i) the number of shares of Preferred Stock set forth
    opposite such Purchaser's name on Exhibit A and (ii) a Warrant to purchase
    the number of shares of Common Stock set forth opposite such Purchaser's
    name on Exhibit A, for the aggregate purchase price set forth opposite such
    Purchaser's name on Exhibit A. The closing of the purchase of such Preferred
    Stock and the Warrants shall take place on the "First Closing," subject to
    the satisfaction (or waiver) of the conditions thereto set forth in Sections
    1.2 and 1.3 below:
 
        (b)  PURCHASE OF COMMON STOCK.  Each of the Purchasers hereby agrees to
    purchase and the Company agrees to sell to each of the Purchasers the number
    of shares of Common Stock set forth opposite such Purchaser's name on
    Exhibit A for the purchase price of $1.00 per share. The closing of the
    purchase of such Common Stock shall take place on the "Second Closing,"
    subject to the satisfaction (or the waiver) of the conditions set forth in
    Sections 1.2 and 1.3 below. Notwithstanding the foregoing, if the
    stockholders of the Company do not approve the proposals to be submitted to
    them at the 1997 Annual Meeting of Stockholders to be held on or prior to
    December 19, 1997, as set forth in Section 1.3(a)(x), each of the Purchasers
    shall be relieved of its obligation to purchase Common Stock at the Second
    Closing.
 
                                       1
<PAGE>
        (c)  PAYMENT AND DELIVERY OF STOCK CERTIFICATES.  On each Closing Date
    (as defined below), (i) each of the Purchasers shall pay the portion of the
    purchase price for the Securities to be issued and sold at the applicable
    Closing to such Purchaser by check or wire transfer to the Company, in
    accordance with the Company's written instructions, against delivery of duly
    executed stock certificates and the warrant which each such Purchaser is
    then purchasing and (ii) the Company shall deliver to each such Purchaser
    such stock certificates and the warrant against delivery of such purchase
    price.
 
        (d)  CLOSING DATES.  Subject to the satisfaction (or waiver) of the
    conditions thereto set forth in Sections 1.2 and 1.3 below, the date and
    time of the issuance and sale of the Preferred Stock, the Warrants and
    Common Stock pursuant to this Agreement (the "Closing Dates") shall be (i)
    in the case of the First Closing, 10:00 a.m. Pacific Standard Time on
    November 10, 1997 (the "First Closing Date"), and (ii) in the case of the
    Second Closing, 10:00 a.m. Pacific Standard Time, three business days
    following notification of the satisfaction (or waiver) of the condition to
    such Closing set forth in Section 1.3(b)(vii) (the "Second Closing Date")
    or, in each case, at such mutually agreed upon time.
 
    1.2  CONDITIONS PRECEDENT TO THE OBLIGATION OF THE COMPANY TO ISSUE AND SELL
THE PREFERRED STOCK, WARRANTS AND COMMON STOCK.  The obligation hereunder of the
Company to issue and sell the Preferred Stock, Warrants and Common Stock to each
of the Purchasers at each respective Closing is subject to the satisfaction, at
or before such Closing, of each of the conditions set forth below. These
conditions are for the Company's sole benefit and may be waived by the Company
at any time in its sole discretion.
 
        (a)  ACCURACY OF THE PURCHASER'S REPRESENTATION AND WARRANTIES.  The
    representations and warranties of the Purchasers contained in this Agreement
    shall be true and correct as of the date when made and as of the applicable
    Closing Date as though made at each such time.
 
        (b)  PERFORMANCE BY THE PURCHASER.  The Purchasers shall have performed,
    satisfied and complied in all respects with all covenants, agreements and
    conditions required by this Agreement to be performed, satisfied or complied
    with by the Company at or prior to the applicable Closing.
 
        (c)  NO INJUNCTION.  No statute, rule, regulation, executive order,
    decree, ruling or injunction shall have been enacted, entered, promulgated
    or endorsed by any court or governmental authority of competent jurisdiction
    which prohibits or adversely affects any of the transactions contemplated by
    this Agreement, and no proceeding shall have been commenced which may have
    the effect of prohibiting or adversely affecting any of the transactions
    contemplated by this Agreement.
 
    1.3  CONDITIONS PRECEDENT TO THE OBLIGATION OF THE PURCHASERS TO ACQUIRE THE
PREFERRED STOCK, WARRANTS AND COMMON STOCK.  The obligation of the Purchasers
hereunder to acquire and pay for the Preferred Stock, Warrants and Common Stock
at each of the First Closing and the Second Closing, as applicable, is subject
to the satisfaction, at or before the Closing Date in respect of such Closing,
of each of the following conditions. Each of these conditions is for each of the
Purchaser's sole benefit and may be waived by a Purchaser at any time in its
sole discretion.
 
        (a) As to the First Closing:
 
            (i)  ACCURACY OF THE COMPANY'S REPRESENTATIONS AND WARRANTIES.  The
       representations and warranties of the Company contained in this Agreement
       shall be true and correct as of the date when made and as of the First
       Closing Date as though made at each such time.
 
            (ii)  PERFORMANCE BY THE COMPANY.  The Company shall have performed,
       satisfied and complied in all respects with all covenants, agreements and
       conditions contained in this Agreement and in all other agreements
       related to this Agreement to be performed, satisfied or complied with by
       the Company at or prior to the First Closing.
 
           (iii)  NO INJUNCTION.  No statute, rule, regulation, executive order,
       decree, ruling or injunction shall have been enacted, entered,
       promulgated or endorsed by any court or governmental authority of
       competent jurisdiction which prohibits or adversely effects any of the
       transactions
 
                                      2
<PAGE>
       contemplated by this Agreement, and no proceeding shall have been
       commenced which may have the effect of prohibiting or adversely affecting
       any of the transactions contemplated by this Agreement.
 
            (iv)  ADVERSE CHANGES.  Since December 31, 1996, no event which had
       or is likely to have a Material Adverse Effect has occurred, except as
       described in the Company's Form 10-Qs filed with the SEC for the
       quarterly periods ended March 31, and June 30, 1997. For purposes of this
       Agreement, "Material Adverse Effect" means any effect on the business,
       operations, properties, prospects, condition, financial or otherwise, net
       worth, or results of operations of the Company and which is material and
       adverse to the Company or to other entities controlled by the Company,
       taken as a whole, and/or any condition or situation which would prohibit
       or otherwise interfere with the ability of the Company or other entity
       controlled by the Company to enter into and perform its obligations under
       this Agreement.
 
            (v)  NO SUSPENSION OF TRADING IN OR DELISTING OF COMMON STOCK.  As
       of the First Closing Date, (A) the trading of the Common Stock shall not
       have been suspended by the SEC, The Nasdaq Stock Market, Inc. ("Nasdaq
       Inc.") or the National Association of Securities Dealers, Inc. (the
       "NASD"), (B) the Common Stock shall not have been delisted from the
       Nasdaq National Market (the "Exchange"), and (C) the Company shall not
       have been advised in writing that the Common Stock will be delisted from
       the Exchange.
 
            (vi)  THE LEGAL OPINION.  The Company shall have delivered to each
       of the Purchasers the opinion of Wilson Sonsini Goodrich & Rosati,
       Professional Corporation, independent counsel to the Company, with
       respect to the matters set forth in Exhibit D attached hereto, dated as
       of the First Closing Date.
 
           (vii)  OFFICER'S CERTIFICATE.  The Company shall have delivered to
       the Purchasers a certificate in such form and substance as shall be
       reasonably satisfactory to the Purchasers, executed by an executive
       officer of the Company as of the First Closing Date, to the effect that
       all of the conditions to the First Closing shall have been satisfied.
 
          (viii)  REGISTRATION RIGHTS AGREEMENT.  The Company and the Purchasers
       shall have executed and delivered the Registration Rights Agreement
       attached hereto as Exhibit E.
 
            (ix)  IRREVOCABLE LETTER OF INSTRUCTION.  The Company shall have
       issued to the transfer agent for the Common Stock (and to any substitute
       or replacement transfer agent for its Common Stock coterminous with the
       Company's appointment of any such substitute or replacement transfer
       agent) irrevocable instructions regarding the issuance of certificates
       representing the Securities in such form and substance as shall be
       reasonably satisfactory to the Purchasers.
 
            (x)  PROXY STATEMENT.  The Company shall have filed with the SEC and
       Nasdaq Inc., a Notice of 1997 Annual Meeting of Stockholders to be held
       on or prior to December 19, 1997, together with a preliminary Proxy
       Statement requesting stockholder approval (A) of an amendment to the
       Company's Certificate of Incorporation providing for the classification
       of the Board of Directors into three classes, with members of each class
       serving staggered three-year terms, (B) of an amendment to the Company's
       Certificate of Incorporation providing for the increase in the number of
       shares of authorized Common Stock from 40,000,000 to 65,000,000 and (C)
       to sell securities of the Company to the Purchasers which prior to such
       sale represent more than 20% of the Company's outstanding voting stock;
       and nominating a four (4) person Board of Directors with Dr. James R.
       Fiebiger being nominated as a Class I Director for an initial term of one
       year, Messrs. Horst G. Sandfort and David J. Dunn being nominated as
       Class II Directors for an initial term of two years, and Mr. Jonathan S.
       Huberman being nominated as a Class III Director for an initial term of
       three years.
 
                                        3
<PAGE>
            (xi)  CERTIFICATE AND DOCUMENTS.  The Company shall have delivered
       to the Purchasers:
 
               (A) the Certificate of Incorporation of the Company, as amended
                   and in effect as of the date of the First Closing, certified
                   by the Secretary of State of the State of Delaware;
 
                (B) certificates, as of the most recent practicable dates, as to
                    the corporate good standing of the Company issued by the
                    Secretary of State of the State of Delaware and the
                    Secretary of State of the State of California;
 
                (C) the By-laws of the Company, as amended and in effect as of
                    the date of the First Closing, certified by the Secretary of
                    the Company; and
 
               (D) resolutions of the Board of Directors of the Company
                   authorizing and approving all matters in connection with this
                   Agreement and the transactions contemplated hereby and
                   authorizing and approving the amendments to the Company's
                   Certificate of Incorporation and the other matters described
                   in Section 1.3(a)(x) of this Agreement, certified by the
                   Secretary of the Company as of the First Closing Date.
 
           (xii)  OTHER MATTERS.  All corporate and other proceedings in
       connection with the transactions contemplated by this Agreement and all
       documents and instruments incident to such transactions shall be
       reasonably satisfactory in substance and form to the Purchasers and their
       counsel, and the Purchasers and their counsel shall have received all
       such counterpart originals or certified or other copies of such documents
       as they may reasonably request.
 
        (b) As to the Second Closing:
 
            (i)  ACCURACY OF THE COMPANY'S REPRESENTATIONS AND WARRANTIES.  The
       representations and warranties of the Company contained in this Agreement
       shall be true and correct as of the date when made and as of the Second
       Closing Date as though made at each such time.
 
            (ii)  PERFORMANCE BY THE COMPANY.  The Company shall have performed,
       satisfied and complied in all respects with all covenants, agreements and
       conditions contained in this Agreement and in all other agreements
       related to this Agreement to be performed, satisfied or complied with by
       the Company at or prior to the Second Closing.
 
           (iii)  ADVERSE CHANGES.  Since December 31, 1996, no event which had
       or is likely to have a Material Adverse Effect has occurred, except as
       described in the Company's Form 10-Qs filed with the SEC for the
       quarterly periods ended March 31, and June 30, 1997.
 
            (iv)  NO SUSPENSION OF TRADING OR DELISTING OF COMMON STOCK.  As of
       the Second Closing Date, (A) the trading of the Common Stock shall not
       have been suspended by the SEC, Nasdaq Inc. or the NASD, (B) the Common
       Stock shall not have been delisted from the Exchange, and (C) the Company
       shall not have been advised in writing that the Common Stock will be
       delisted from the Exchange.
 
            (v)  THE LEGAL OPINION.  The Company shall have delivered to each of
       the Purchasers the opinion of Wilson Sonsini Goodrich & Rosati,
       Professional Corporation, independent counsel to the Company, dated as of
       the Second Closing Date, with respect to the matters set forth in Exhibit
       D attached hereto, dated as of the Second Closing Date.
 
            (vi)  OFFICER'S CERTIFICATE.  The Company shall have delivered to
       the Purchasers a certificate in such form and substance as shall be
       reasonably satisfactory to the Purchasers, executed by an executive
       officer of the Company as of the Second Closing Date, to the effect that
       all the conditions to the Second Closing shall have been satisfied.
 
                                        4
<PAGE>
           (vii)  STOCKHOLDER'S MEETING.  The stockholders of the Company shall
       have approved the amendments to the Company's Certificate of
       Incorporation and other matters specified in Section 1.3(a)(x).
 
          (viii)  HART-SCOTT-RODINO ACT.  All applicable waiting periods (and
       any extensions thereof) under the Hart-Scott-Rodino Act shall have
       expired or otherwise been terminated.
 
            (ix)  AMENDMENT TO BYLAWS.  The Board of Directors of the Company
       shall have amended the Bylaws of the Company to include a provision with
       respect to the matters specified in Section 4.10.
 
            (x)  CERTIFICATE AND DOCUMENTS.  The Company shall have delivered to
       the Purchasers:
 
               (A) the Certificate of Incorporation of the Company, as amended
                   and in effect as of the date of the Second Closing, certified
                   by the Secretary of State of the State of Delaware;
 
                (B) certificates, as of the most recent practicable dates, as to
                    the corporate good standing of the Company issued by the
                    Secretary of State of the State of Delaware and the
                    Secretary of State of the State of California;
 
                (C) the By-laws of the Company, as amended and in effect as of
                    the date of the Second Closing, certified by the Secretary
                    of the Company; and
 
               (D) resolutions of the Board of Directors of the Company
                   authorizing and approving all matters in connection with this
                   Agreement and the transactions contemplated hereby, certified
                   by the Secretary of the Company as of the Second Closing
                   Date.
 
            (xi)  OTHER MATTERS.  All corporate and other proceedings in
       connection with the transactions contemplated by this Agreement and all
       documents and instruments incident to such transactions shall be
       reasonably satisfactory in substance and form to the Purchasers and their
       counsel, and the Purchasers and their counsel shall have received all
       such counterpart originals or certified or other copies of such documents
       as they may reasonably request.
 
    1.4  CONVERSION OF PREFERRED STOCK.  In the event the stockholders of the
Company fail to approve the proposals specified in Section 1.3(a)(x) at the 1997
Annual Meeting of Stockholders to be held on or prior to December 19, 1997, the
Purchasers holding at least 51% of the then outstanding shares of Preferred
Stock shall have the right, upon fifteen (15) days prior written notice to the
Company, to redeem the Preferred Stock, in whole or in part, for a cash payment
from the Company equal to $4.5825 per share plus accrued and unpaid dividends
thereon (subject to adjustment for stock splits, stock dividends, combination or
similar recapitalizations affecting such shares); provided, however, that if the
Purchasers do not elect to redeem the Preferred Stock, as provided above, the
Conversion Price (as defined in the Certificate of Designation of the Preferred
Stock) of all shares of the Preferred Stock shall be reduced from $1.00 to $.75
per share.
 
2. REPRESENTATIONS AND WARRANTIES OF PURCHASER
 
    Each of the Purchasers severally represents and warrants to the Company
that:
 
        2.1  NO GOVERNMENT RECOMMENDATION OR APPROVAL.  Such Purchaser
    understands that no United States federal or state agency, or similar agency
    of any other country, has passed upon or made any recommendation or
    endorsement of the Company or the offering of the Securities.
 
        2.2  INTENT.  Such Purchaser is purchasing the Securities for its own
    account and not with a view towards distribution and such Purchaser has no
    present arrangement (whether or not legally binding) at any time to sell the
    Securities to or through any person or entity; provided, however, that by
    making the representations herein, such Purchaser does not agree to hold the
    Securities for any minimum or
 
                                        5
<PAGE>
    other specific term and reserves the right to dispose of the Securities at
    any time in accordance with Federal and state securities laws applicable to
    such disposition. Such Purchaser understands that the Securities must be
    held indefinitely unless such Securities are subsequently registered under
    the Securities Act or an exemption from registration is available. Such
    Purchaser has been advised or is aware of the provisions of Rule 144
    promulgated under the Securities Act.
 
        2.3  SOPHISTICATED INVESTOR.  Such Purchaser is a sophisticated investor
    (as described in Rule 506(b)(2)(ii) of Regulation D) and, except for the
    Perscilla Faily Trust, an accredited investor (as defined in Rule 501 of
    Regulation D), and such Purchaser has such experience in business and
    financial matters that it is capable of evaluating the merits and risks of
    an investment in the Securities. Such Purchaser acknowledges that the
    Securities are speculative and involve a high degree of risk.
 
        2.4  INDEPENDENT INVESTIGATION.  Such Purchaser, in making its decision
    to purchase the Securities subscribed for hereunder, has relied upon an
    independent investigation made by it and/or its representatives and has not
    relied on any oral or written representations or assurances from the Company
    or any representative or agent of the Company, other than as set forth in
    this Agreement, in the public filings of the Company and in the documents
    described herein. Prior to the date hereof, such Purchaser has been
    furnished with and has reviewed the Company's latest proxy statement and
    Annual Report on Form 10-K sent to the Company's stockholders and all
    documents filed by the Company since December 31, 1996 pursuant to Sections
    13(a), 13(c), 14 or 15(d) of the Securities Exchange Act of 1934, as amended
    (the "Exchange Act"), (such documents are collectively referred to in this
    Agreement as the "Exchange Act Reports"). Such Purchaser has had a
    reasonable opportunity to ask questions of and receive answers from the
    Company concerning the Company and the offering of securities and has
    received satisfactory answers to all inquiries it has made with respect to
    the Company and the Securities. Such Purchaser acknowledges the price and
    terms of the Securities offered hereby have been determined by negotiation
    based, in part, on the market price for the Common Stock, and does not
    necessarily bear any relationship to the assets, book value or potential
    performance of the Company or any other recognized criteria of value.
 
        2.5  AUTHORITY.  This Agreement has been duly authorized and validly
    executed, and delivered by such Purchaser and is a valid and binding
    agreement enforceable in accordance with its terms, subject to general
    principles of equity and to bankruptcy or other laws affecting the
    enforcement of creditors' rights generally.
 
        2.6  NO LEGAL ADVICE FROM COMPANY.  Such Purchaser acknowledges that it
    has had the opportunity to review this Agreement and the transactions
    contemplated by this Agreement with his or its own legal counsel and tax
    advisors. Except for any statements or representations of the Company made
    in this Agreement and in the Exchange Act Reports, the Purchaser is relying
    solely on such counsel and advisors and not on any statements or
    representations of the Company or any of its representative or agents for
    legal, tax or investment advice with respect to this investment, the
    transactions contemplated by this Agreement or the securities laws of any
    jurisdiction.
 
        2.7  NO BROKERS.  Such Purchaser has taken no action which would give
    rise to any claim by any person for brokerage commission, finder's fees or
    similar payments by the Company relating to this Agreement or the
    transactions contemplated hereby.
 
        2.8  NOT AN AFFILIATE.  Prior to the First Closing, such Purchaser has
    not been an officer, director or "affiliate" (as that term is defined in
    Rule 405 of the Securities Act) of the Company.
 
        2.9  RELIANCE ON REPRESENTATIONS AND WARRANTIES.  Such Purchaser
    understands that the Securities are being offered and sold to it in reliance
    on specific provisions of United States federal and state securities laws
    and that the Company is relying upon the truth and accuracy of the
    representations, warranties, agreements, acknowledgements and understandings
    of such Purchaser set forth in this Agreement in order to determine the
    applicability of such provisions.
 
                                        6
<PAGE>
3.  REPRESENTATIONS AND WARRANTIES OF THE COMPANY
 
    Subject to and except as disclosed by the Company in APPENDIX A annexed
hereto (the "Disclosure Schedule"), the Company represents and warrants to each
of the Purchasers that:
 
        3.1  COMPANY STATUS.  The Company has registered the Common Stock
    pursuant to Section 12(b) or 12(g) of the Exchange Act, is in full
    compliance with all reporting requirements of the Exchange Act, and the
    Company has maintained all requirements for the continued listing of the
    Common Stock, and the Common Stock is currently listed on the Exchange. The
    Company has not been advised that the Common Stock will be delisted from the
    Exchange.
 
        3.2  CURRENT PUBLIC INFORMATION.  The Exchange Act Reports are the only
    filings made by the Company since December 31, 1996 pursuant to Sections
    13(a), 13(c), 14 and 15(d) of the Exchange Act.
 
        3.3  NO DIRECTED SELLING EFFORTS OR GENERAL SOLICITATION IN REGARD TO
    THIS TRANSACTION.  Neither the Company nor any of its affiliates nor any
    distributor or any person acting on its or their behalf has conducted any
    "directed selling efforts" with respect to the Preferred Stock, the Warrants
    or the Common Stock nor has the Company conducted any general solicitation
    (as that term is used in Regulation D) with respect to any of the
    Securities, nor have they made any offers or sales of any security or
    solicited any offers to buy any security, under circumstances that would
    require registration of the Securities under the Securities Act.
 
        3.4  CAPITALIZATION; ISSUANCE OF SECURITIES.
 
        (a) As of the date of this Agreement, the authorized capital stock of
    the Company consists of 40,000,000 shares of Common Stock, of which
    35,538,756 shares are issued and outstanding, and 2,000,000 shares of series
    preferred stock, of which 1,000,000 shares have been designated Preferred
    Stock, none of which shares are issued or outstanding. The Company has
    adopted and filed the Certificate of Designation with the Secretary of State
    of the State of Delaware. As of the date of the Second Closing, the
    authorized capital stock of the Company consists of 65,000,000 shares of
    Common Stock and 2,000,000 shares of series preferred stock, of which
    1,000,000 shares have been designated Preferred Stock, all of which are
    issued and outstanding. All of the issued and outstanding shares of Common
    Stock have been duly and validly issued and are fully paid and
    non-assessable. Except as set forth in Section 3.4 of the Disclosure
    Schedule (i) no subscription, warrant, option, convertible security or other
    right (contingent or otherwise) to purchase or acquire any shares of capital
    stock of the Company is authorized or outstanding, (ii) the Company has no
    obligation (contingent or otherwise) to issue any subscription, warrant,
    option, convertible security or other such right or to issue or distribute
    to holders of any shares of its capital stock any evidences of indebtedness
    or assets of the Company, and (iii) the Company has no obligation
    (contingent or otherwise) to purchase, redeem or otherwise acquire any
    shares of its capital stock or any interest therein or to pay any dividend
    or make any other distribution in respect thereof. All of the issued and
    outstanding shares of capital stock of the Company have been offered, issued
    and sold by the Company in compliance with applicable Federal and state
    securities laws.
 
        (b) The issuance, sale and delivery of the Securities in accordance with
    this Agreement, the issuance and delivery of the shares of Common Stock
    issuable upon conversion of the Preferred Stock and the issuance and
    delivery of the shares of Common Stock upon exercise of the Warrants, have
    been duly authorized by all necessary corporate action on the part of the
    Company, and after the approval by the Company's stockholders of an
    amendment to the Company's Certificate of Incorporation increasing the
    number of authorized shares of Common Stock, all such shares shall be duly
    reserved for issuance. Upon issuance of the Securities (other than the
    Underlying Stock), the Securities (other than the Underlying Stock) will be
    duly and validly issued, fully paid and non-assessable; after the approval
    by the Company's stockholders of an amendment to the Company's
 
                                        7
<PAGE>
    Certificate of Incorporation increasing the number of authorized shares of
    Common Stock, the shares of Common Stock issuable upon conversion of the
    Preferred Stock shall be duly reserved by the Company for issuance, and when
    issued and delivered in accordance with the terms of the Preferred Stock,
    will be duly and validly issued, fully paid and non-assessable; and after
    the approval by the Company's stockholders of an amendment to the Company's
    Certificate of Incorporation increasing the number of authorized shares of
    Common Stock, the shares of Common Stock issuable upon exercise of the
    Warrants have been duly reserved by the Company for issuance, and when
    issued and delivered in accordance with the terms of the Warrants, will be
    duly and validly issued, fully paid and non-assessable.
 
        (c) There are no agreements, written or oral, between the Company and
    any holder of its capital stock or any security convertible into its capital
    stock, or to the best of the Company's knowledge, among any such holders,
    relating to the acquisition (including, without limitation, rights of first
    refusal or pre-emptive rights), disposition, registration under the
    Securities Act, or voting of the capital stock of the Company.
 
        3.5  ORGANIZATION AND QUALIFICATION.  The Company is a corporation duly
    incorporated and existing in good standing under the laws of the State of
    Delaware and has the requisite corporate power to own its properties and to
    carry on its business as now being conducted. The Company does not have any
    subsidiaries, except for those listed on its Form 10-K filed with the SEC
    for the year ended December 31, 1996. The Company and each such subsidiary
    is duly qualified as a foreign corporation to do business and is in good
    standing in every jurisdiction in which the nature of the business conducted
    or property owned by it makes such qualification necessary other than those
    in which the failure so to qualify would not have a Material Adverse Effect.
    References to the "Company" in this Agreement shall also include each
    subsidiary of the Company, except where the context otherwise requires.
 
        3.6  AUTHORIZATION; ENFORCEMENT.  (i) The Company has the requisite
    corporate power and authority to enter into and perform this Agreement and
    to issue the Securities in accordance with the terms hereof and thereof,
    (ii) the execution, issuance and delivery of this Agreement, the Preferred
    Stock, the Warrants and the Common Stock by the Company and all other
    agreements, including without limitation, the Registration Rights Agreement,
    required to be executed by the Company as provided herein (collectively, the
    "Ancillary Agreements"), and the consummation by the Company of the
    transactions contemplated hereby and thereby, including without limitation,
    the issuance of Common Stock upon the conversion or exercise thereof, have
    been duly authorized by all necessary corporate action, and no further
    consent or authorization of the Company or its Board of Directors or
    stockholders is required, (iii) this Agreement and the Ancillary Agreements
    have been duly executed and delivered by the Company, and (iv) this
    Agreement, the Ancillary Agreements, the Preferred Stock and the Warrants
    constitute, and upon execution, issuance and delivery thereof the Preferred
    Stock and the Warrants shall be, valid and binding obligations of the
    Company enforceable against the Company in accordance with their terms,
    except as such enforceability may be limited by applicable bankruptcy,
    insolvency, or similar laws relating to, or affecting generally the
    enforcement of, creditors' rights and remedies or by other equitable
    principles of general application.
 
        3.7  CORPORATE DOCUMENTS.  The Company has furnished or made available
    to the Purchaser true and correct copies of the Company's Certificate of
    Incorporation, as in effect on the date hereof (the "Certificate"), and the
    Company's By-Laws, as in effect on the date hereof (the "By-Laws").
 
        3.8  NO CONFLICTS.  The execution, delivery and performance of this
    Agreement and the Preferred Stock, the Warrants and Common Stock by the
    Company and the consummation by the Company of the transactions contemplated
    hereby and thereby, including without limitation the issuance of common
    stock upon the conversion or exercise thereof, do not and will not (i)
    result in a violation of or conflict with the Certificate or By-Laws or (ii)
    violate, conflict with, or constitute a
 
                                        8
<PAGE>
    breach of or default (or an event which with notice or lapse of time or both
    would become a default) under, or give to others any rights of termination,
    amendment, acceleration or cancellation of, any material agreement,
    indenture or instrument to which the Company or any of its subsidiaries is a
    party, or result in a violation of any Federal, state, local or foreign law,
    rule, regulation, order, judgment or decree (including federal and state
    securities laws and regulations) applicable to the Company or any of its
    subsidiaries or by which any property or asset of the Company or any of its
    subsidiaries is bound or affected, except for such conflicts, defaults,
    terminations, amendments, accelerations, cancellations and violations as
    would not, individually or in the aggregate, have a Material Adverse Effect.
    The business of the Company is not being conducted in violation of any law,
    ordinance or regulations of any governmental entity, except for possible
    violations which either singly or in the aggregate do not and will not have
    a Material Adverse Effect. The Company is not required under Federal, state
    or local law, rule or regulation in the United States to obtain any consent,
    authorization or order of, or make any filing or registration with, any
    court or governmental agency in order for it to execute, deliver or perform
    any of its obligations under this Agreement or issue and sell the Securities
    in accordance with the terms hereof and thereof (other than (i) compliance
    with the applicable requirements of the Hart-Scott-Rodino Antitrust
    Improvements Act of 1976, as amended (the "Hart-Scott-Rodino Act") and (ii)
    any SEC, NASD, Nasdaq Inc. or state securities filings which may be required
    to be made by the Company subsequent to either the First Closing or the
    Second Closing, and any registration statement which may be filed pursuant
    hereto); provided that, for purposes of the representation made in this
    sentence, the Company is assuming and relying upon the accuracy of the
    relevant representations and agreements of the Purchasers herein.
 
        3.9  EXCHANGE ACT REPORTS; FINANCIAL STATEMENTS.  The Company has
    delivered or made available to the Purchasers true and complete copies of
    the Exchange Act Reports (including, without limitation, proxy information
    and solicitation materials). As of their respective dates, the Exchange Act
    Reports complied in all material respects with the requirements of the
    Exchange Act and rules and regulations of the SEC promulgated thereunder and
    other Federal, state and local laws, rules and regulations applicable to
    such Exchange Act Reports, and none of the Exchange Act Reports contained
    any untrue statement of a material fact or omitted to state a material fact
    required to be stated therein or necessary in order to make the statements
    therein, in light of the circumstances under which they were made, not
    misleading. The financial statements of the Company included in the Exchange
    Act Reports comply as to form in all material respects with applicable
    accounting requirements and the published rules and regulations of the SEC
    or other applicable rules and regulations with respect thereto. Such
    financial statements have been prepared in accordance with generally
    accepted accounting principles applied on a consistent basis during the
    periods involved (except (i) as may be otherwise indicated in such financial
    statements or the notes thereto or (ii) in the case of unaudited interim
    statements, to the extent they may not include footnotes or may be condensed
    or summary statements) and fairly present the financial condition of the
    Company as of the dates thereof and the results of operations and cash flows
    for the periods then ended (subject, in the case of unaudited statements, to
    normal year-end audit adjustments which in the aggregate will not be
    material).
 
        3.10  NO MATERIAL ADVERSE CHANGE.  Since December 31, 1996, the date
    through which the most recent annual report of the Company on Form 10-K
    which has been prepared and filed with the SEC, a copy of which is included
    in the Exchange Act Reports, there has been no material adverse change in
    the business, operations, properties, prospects, condition, financial or
    otherwise, net worth, or results of operations of the Company or its
    subsidiaries, except as described in the Company's Form 10-Qs filed with the
    SEC for the quarterly periods ended March 31, and June 30, 1997, and the
    Disclosure Schedule.
 
        3.11  NO UNDISCLOSED LIABILITIES.  The Company and its subsidiaries have
    no liabilities or obligations of any type, which in the aggregate exceed
    $100,000, that are not fully reflected or disclosed in
 
                                        9
<PAGE>
    the Exchange Act Reports, other than those incurred in the ordinary course
    of the Company's or its subsidiaries' respective businesses since June 30,
    1997.
 
        3.12  NO UNDISCLOSED EVENTS OR CIRCUMSTANCES.  No event or circumstance
    has occurred or exists with respect to the Company or its subsidiaries or
    their respective businesses, properties, prospects, operations or condition,
    financial or otherwise, which, under applicable law, rule or regulation,
    requires disclosure in the Exchange Act Reports or public disclosure prior
    to the date hereof by the Company and which has not been so disclosed.
 
        3.13  NO INTEGRATED OFFERING.  Neither the Company, nor any of its
    affiliates, nor any person acting on its or their behalf has, directly or
    indirectly, made any offers or sales of any security or solicited any offers
    to buy any security, under circumstances that would require registration
    under the Securities Act of the offer, issuance and sale of the Securities
    to the Purchasers.
 
        3.14  NO BROKERS.  The Company has taken no action which would give rise
    to any claim by any person for brokerage commissions, finder's fees or
    similar payments by the Purchasers relating to this Agreement or the
    transactions contemplated hereby.
 
        3.15  PROFORMA SEPTEMBER 30, 1997 FINANCIAL STATEMENTS.  The proforma
    balance sheet and financial statements of the Company as of September 30,
    1997 (the "Pro Forma Financials") which have been furnished to the
    Purchasers are true and correct in all material respects. The Pro Forma
    Financials have been prepared in accordance with generally accepted
    accounting principles applied on a consistent basis during the periods
    involved (except to the extent they may not include footnotes or may be
    condensed or summary statements) and fairly present the financial condition
    of the Company as of the dates thereof and the results of operations and
    cash flows for the periods then ended (subject to normal year-end audit
    adjustments which in the aggregate will not be material).
 
        3.16  GOVERNMENTAL CONSENTS.  No consent, approval, order or
    authorization of, or registration, qualification, designation, declaration
    or filing with, any governmental authority is required on the part of the
    Company in connection with the execution and delivery of this Agreement, the
    offer, issuance, sale and delivery of the Securities, or the other
    transactions to be consummated at the First and Second Closings (other than
    the stockholder approval with respect to the Second Closing in accordance
    with Section 1.3(b)(vii)), as contemplated by this Agreement, except such
    filings as shall have been made prior to and shall be effective on and as of
    such Closing. Based on the representations made by the Purchasers in Section
    2 of this Agreement, the offer and sale of the Securities to the Purchasers
    will be in compliance with applicable Federal and state securities laws.
 
        3.17  LITIGATION.  There is no action, suit or proceeding, or
    governmental inquiry or investigation, pending, or, to the best of the
    Company's knowledge, any basis therefor or threat thereof, against the
    Company, which questions the validity of this Agreement or the right of the
    Company to enter into it, or which might result, either individually or in
    the aggregate, in a Material Adverse Effect.
 
        3.18  INTELLECTUAL PROPERTY.  Set forth in the Disclosure Schedule is a
    true and complete list of all patents, patent applications, trademarks,
    service marks, trademark and service mark applications, trade names,
    copyright registrations and licenses presently used by the Company or
    necessary for the conduct of the Company's business as conducted and as
    proposed to be conducted, as well as any agreement under which the Company
    has access to any confidential information used by the Company in its
    business (collectively, the "Intellectual Property Rights"). The Company
    owns, or has the right to use under the agreements or upon the terms
    described in the Disclosure Schedule, all of the Intellectual Property
    Rights, and has taken all actions reasonably necessary to protect the
    Intellectual Property Rights. The business conducted or proposed by the
    Company does not and will not cause the Company to infringe or violate any
    of the patents, trademarks, service marks, trade names, copyrights,
    licenses, trade secrets or other intellectual property rights of any other
    person or entity. The Company is not aware that any employee is obligated
    under any contract (including any license, covenant or
 
                                        10
<PAGE>
    commitment of any nature), or subject to any judgment, decree or order of
    any court or administrative agency, that would conflict or interfere with
    (i) the performance of employee's duties as an officer, employee or director
    of the Company, (ii) the use of such employee's best efforts to promote the
    interests of the Company or (iii) the Company's business as conducted or
    proposed to be conducted. No other person or entity (including without
    limitation any prior employer of any employee of the Company) has any right
    to or interest in any inventions, improvements, discoveries or other
    confidential information utilized by the Company in its business.
 
        3.19  MATERIAL CONTRACTS AND OBLIGATIONS.  Section 3.19 of the
    Disclosure Schedule lists each material agreement to which the Company is a
    party or subject, including without limitation all material employment and
    consulting agreements, employee benefit, bonus, pension, profit-sharing,
    stock option, stock purchase and similar plans and arrangements, and
    distributor and sales representative agreements. The Disclosure Schedule
    lists each agreement with any stockholder, officer or director of the
    Company, or any "affiliate" or "associate" of such persons (as such terms
    are defined in the rules and regulations promulgated under the Securities
    Act), including without limitation any agreement or other arrangement
    providing for the furnishing of services by, rental of real or personal
    property from, or otherwise requiring payments to, any such person or entity
    and any agreement relating to the Intellectual Property Rights. The Company
    has delivered to counsel to the Purchasers copies of all of the foregoing
    agreements. All of such agreements and contracts are valid, binding and in
    full force and effect.
 
        3.20  EMPLOYEES.  All employees of the Company whose employment
    responsibility requires access to confidential or proprietary information of
    the Company have executed and delivered nondisclosure and assignment of
    invention agreements in the form attached hereto as Exhibit F, and all of
    such agreements are in full force and effect.
 
        3.21  ERISA.  The Company does not have or otherwise contribute to or
    participate in any employee benefit plan subject to the Employee Retirement
    Income Security Act of 1974.
 
        3.22  BOOKS AND RECORDS.  The minute books of the Company contain
    complete and accurate records of all meetings and other corporate actions of
    its stockholders and its Board of Directors and committees thereof. The
    Company has delivered to counsel to the Purchasers copies of all of the
    minutes of all meetings and other corporate actions of its stockholders and
    its Board of Directors and committees thereof held or taken since October 1,
    1995.
 
        3.23  SECTION 203 OF THE DELAWARE GENERAL CORPORATION LAW.  The
    transactions contemplated by this Agreement have been approved by the Board
    of Directors of the Company for purposes of Section 203 of the Delaware
    General Corporation Law.
 
        3.24  DISCLOSURES.  Neither this Agreement nor any Attachment or Exhibit
    hereto, nor any report, certificate or instrument furnished to any Purchaser
    or its counsel in connection with the transactions contemplated by this
    Agreement, when read together, contains or will contain any untrue statement
    of a material fact or omits or will omit to state a material fact necessary
    in order to make the statements contained herein or therein, in light of the
    circumstances under which they were made, not misleading. The Company knows
    of no information or fact which has or would have a Material Adverse Effect
    which has not been disclosed in the Disclosure Schedule.
 
4. COVENANTS
 
    4.1  REGISTRATION RIGHTS.  The Company agrees that, at the First Closing, it
will enter into a Registration Rights Agreement with the Purchasers, in the form
and substance of Exhibit E attached hereto.
 
                                        11
<PAGE>
    4.2  RESERVATION OF COMMON STOCK.
 
    (a) As of the date hereof, the Company has reserved and the Company shall
continue to reserve and keep available at all times, free of preemptive rights,
250,000 shares of Common Stock for the purpose of enabling the Company to
satisfy any obligation to issue shares of its Common Stock upon conversion of
the Preferred Stock and exercise of the Warrants, and to sell to each of the
Purchasers shares of its Common Stock at the Second Closing. The number of
shares so reserved shall be increased to reflect stock splits and stock
dividends and distributions.
 
    (b) From and after the date of stockholder approval of an amendment to the
Company's Certificate of Incorporation to increase the number of authorized
shares of Common Stock, the Company shall reserve and keep available at all
times, free of preemptive rights, shares of Common Stock for the purpose of
enabling the Company to satisfy any obligation to issue shares of its Common
Stock upon conversion of the Preferred Stock and exercise of the Warrants, and
to sell to each of the Purchasers shares of its Common Stock at the Second
Closing. The number of shares so reserved shall be increased to reflect stock
splits and stock dividends and distributions.
 
    4.3  LISTING OF SHARES.  The Company hereby agrees, promptly following the
First Closing, to take such action to cause the Shares to be listed on the
Exchange as promptly as possible but no later than 90 days following the First
Closing Date. The Company further agrees, if the Company applies to have its
Common Stock traded on any principal stock exchange or market, it will include
the Shares in such application and will take such other action as is necessary
or desirable to cause the Shares to be listed on such other exchange or market
as promptly as possible.
 
    4.4  EXCHANGE ACT REGISTRATION.  The Company will cause its Common Stock to
continue to be registered under Section 12(g) or 12(b) of the Exchange Act, will
comply in all respects with its reporting and filing obligations under the
Exchange Act, and will not take any action or file any document (whether or not
permitted by the Exchange Act or the rules thereunder) to terminate or suspend
such registration or to terminate or suspend its reporting and filing
obligations under the Exchange Act. The Company will take all action under its
control to continue the listing and trading of its Common Stock on the Exchange
and will comply in all respects with the Company's reporting, filing and other
obligations under the bylaws or rules of the NASD, the Nasdaq Inc. and the
Exchange.
 
    4.5  LEGENDS.  The Shares, and certificates evidencing the same shall, upon
the effectiveness of the Registration Statement to be filed pursuant to the
Registration Rights Agreement described in Section 4.1 (the "Registration
Statement") be free of legends (except as provided in Section 5.1 below), "stop
transfers," so-called, "stock transfer restrictions," or other restrictions.
 
    4.6  CORPORATE EXISTENCE.  The Company will take all steps necessary to
preserve and continue the corporate existence of the Company.
 
    4.7  BOARD OF DIRECTORS NOMINATIONS.  The Company will cause David J. Dunn
and Jonathan S. Huberman, or their successors as designated by the Purchasers
(by action of the holders of at least 51% of the then outstanding Shares on
as-converted basis), to be nominated on the Company's management slate of
Directors for election to the Company's Board of Directors at the 1997 Annual
Meeting of Stockholders to be held on or prior to December 19, 1997, and for
re-election to the Company's Board of Directors on each Proxy Statement filed
for each subsequent Annual Meeting of Stockholders (or Special Meeting of
Stockholders where directors are elected) as their respective board seats come
up for re-election until the earlier of (a) the date that the Company first
reports Annual Net Income of at least Fifteen Million Dollars ($15,000,000) and
(b) the date that the Purchasers (including for this purpose each of the
Purchaser's general partners and members of their respective immediate families
to whom shares may have been distributed by a Purchaser) collectively own less
than the Minimum Holdings (as defined below). The "Minimum Holdings" shall be
the number of shares of Common Stock equal to 50% of the sum of (i) 4,582,500
(subject to appropriate adjustment for any stock dividend, stock split,
combination or other
 
                                        12
<PAGE>
similar recapitalization) (such number being the total number of shares of
Common Stock issuable, as of the First Closing, upon conversion of the Preferred
Stock issued to the Purchasers at the First Closing) and (ii) the total number
of shares of Common Stock, if any, issued to the Purchasers at the Second
Closing. For purposes of determining the total number of shares of Common Stock
owned by the Purchasers, each of the Purchaser's general partners and members of
their respective immediate families to whom shares may have been distributed by
a Purchaser, such holders shall be deemed to own the total number of shares of
Common Stock issuable upon conversion of the Preferred Stock. "Annual Net
Income", as used herein, means the net income of the Company for a full fiscal
year as reported in the Company's audited financial statements for such year,
adjusted, however, by excluding from revenue for such fiscal year any
extraordinary or non-recurring revenue and any up-front license fees which
entitle the licensee-payor to license rights for a period in excess of one year.
 
    4.8  RIGHT OF FIRST REFUSAL.
 
    (a) Until such time as the earlier of (i) the date that the Company first
reports Annual Net Income of Fifteen Million Dollars ($15,000,000) and (ii) the
date that the Purchasers and their respective affiliates described in Section
4.7 collectively own less than the Minimum Holdings, each of the Purchasers
shall have the right of first refusal to purchase all or part of its pro rata
share of any New Securities (as defined below) which the Company may, from time
to time, propose to sell and issue, subject to the terms and conditions set
forth below. Each Purchaser's pro rata share, for purposes of this Section 4.8,
shall equal a fraction, the numerator of which is the number of shares of Common
Stock then held by such Purchaser or issuable upon conversion or exercise of any
shares of Preferred Stock, the Warrants or other convertible securities,
options, rights or warrants then held by such Purchaser, and the denominator of
which is the total number of shares of Common Stock then outstanding plus the
number of shares of Common Stock issuable upon conversion or exercise of then
outstanding Preferred Stock or the Warrants or other convertible securities,
option, rights or warrants held by the Purchasers.
 
    (b) "New Securities" shall mean any shares of capital stock of the Company
whether now authorized or not, and rights, options or warrants to purchase
capital stock, and securities of any type whatsoever which are, or may become,
convertible into capital stock; provided, however, that the term "New
Securities" does not include
 
        (i) the shares of Preferred Stock and the Warrants issued or issuable to
    the Purchasers pursuant to the terms of this Agreement or the shares of
    Common Stock issued or issuable to the Purchasers upon conversion of such
    securities;
 
        (ii) securities issued for the acquisition of another corporation by the
    Company by merger, purchase of substantially all the assets of such
    corporation or another reorganization resulting in the ownership by the
    Company of not less than a majority of the voting power of such corporation;
 
       (iii) not more than 4,037,618 shares of Common Stock (such number being
    subject to adjustment for any stock dividend, stock split, subdivision,
    combination or other recapitalization of the Common Stock of the Company)
    issued to directors or employees of or consultants to the Company pursuant
    to the Company's stock option plans and such additional shares of Common
    Stock that may be issued to employees of or consultants to the Company
    pursuant to stock option plans approved by a majority of the members of the
    Company's Board of Directors then in office;
 
        (iv) not more than 117,433 shares of Common Stock (such number being
    subject to adjustment for any stock dividend, stock split, subdivision,
    combination or other recapitalization of the Common Stock of the Company)
    issued to employees of the Company pursuant to the Company's employee stock
    purchase plan;
 
        (v) not more than 304,500 shares of Common Stock (such number being
    subject to adjustment for any stock dividend, stock split, subdivision,
    combination or other recapitalization of the Common
 
                                        13
<PAGE>
    Stock of the Company) issued to Halifax Fund L.P. or Capital Ventures
    International or their permitted transferees, pursuant to warrants issued to
    such holders and outstanding on the date hereof;
 
        (vi) not more than 202,595 shares of Common Stock (such number being
    subject to adjustment for any stock dividend, stock split, subdivision,
    combination or other recapitalization of the Common Stock of the Company)
    issued to Benjamin Huberman, James Fiebiger, Ton Tanke and Horst Sandfort or
    their permitted transferees, pursuant to warrants issued to such holders and
    outstanding on the date hereof;
 
       (vii) not more than 500,000 shares of Common Stock (such number being
    subject to adjustment for any stock dividend, stock split, subdivision,
    combination or other recapitalization of the Common Stock of the Company)
    issued to Siemens Aktiengesellschaft ("Siemens"), pursuant to Section 5.1 of
    that certain License Agreement between the Company and Siemens dated October
    22, 1997; or
 
      (viii) securities issued as a result of any stock split, stock dividend or
    reclassification of Common Stock, distributable on a pro rata basis to all
    holders of Common Stock.
 
    (c) In the event the Company intends to issue New Securities, it shall give
each Purchaser written notice of such intention, describing the type of New
Securities to be issued, the price thereof and the general terms upon which the
Company proposes to effect such issuance. Each of the Purchasers shall have 20
days from the date of its receipt of any such notice to agree to purchase all or
part of its pro rata share of New Securities, and any additional New Securities
not purchased by the other Purchasers, for the price and upon the general terms
and conditions specified in the Company's notice by giving written notice to the
Company stating the quantity of New Securities to be so purchased. In the event
a Purchaser elects not to purchase all of its pro rata share of New Securities,
and if each of the other Purchasers has given written notice to the Company that
it does not desire to purchase the New Securities not being purchased, the
Company may issue the New Securities described in the Company's notice within 30
days after the expiration of such 20-day period, for the price and upon the
general terms and conditions specified in the Company's notice to the
Purchasers.
 
    (d) For purposes of this Section 4.8, "Purchaser" shall include the general
partners, officers or other affiliates of the Purchaser and members of their
families, and the Purchasers may apportion, to the extent such apportionment
would not prevent the Company from issuing New Securities in satisfaction of its
obligations under this Section 4.8 pursuant to an exemption from registration
under the Securities Act, its pro rata share among itself and such general
partners, officers, affiliates and family members in such proportion as it deems
appropriate.
 
    4.9  ABSENCE OF STOCKHOLDER APPROVAL.  In the event the stockholders of the
Company do not approve the proposals described in Section 1.3(a)(x) of this
Agreement at the Company's 1997 Annual Meeting of Stockholders to be held on or
prior to December 19, 1997, the Company shall promptly reimburse each of the
Purchasers for the reasonable costs and expenses, including reasonable
attorneys' fees, incurred by such Purchaser in connection with this Agreement
and the transactions contemplated hereby; and the condition to exercise
contained in the second paragraph of the Warrants shall cease to apply with the
effect that such Warrants shall be irrevocably exercisable in accordance with
their terms.
 
    4.10  BOARD OF DIRECTORS EXPANSION, ETC.  The Company and the Purchasers
agree that the election of the Chairman of the Board of the Company, if any, and
the nomination of additional Directors to serve as members of the Board beyond
the number specified in Section 1.3(a)(x) of this Agreement shall require the
affirmative vote of three-fourths of the members of the Board of Directors then
in office, and the Company shall use its best efforts to cause its Board of
Directors to amend by the By-laws of the Company to include therein such a
provision. Any amendments to such bylaw provision shall require the affirmative
vote of three-fourths of the members of the Board of Directors then in office.
 
    4.11  HART-SCOTT-RODINO ACT.  The Company and the Purchasers shall each
promptly file any Notification and Report Forms and related material that it may
be required to file with the Federal Trade
 
                                        14
<PAGE>
Commission and the Antitrust Division of the United States Department of Justice
under the Hart-Scott-Rodino Act, shall use its best efforts to obtain an early
termination of the applicable waiting period, and shall make any further filings
or information submissions pursuant thereto that may be necessary, proper or
advisable.
 
    4.12  SALE OF SHARES UNDER RULE 144.  From and after the First Closing, at
the request of any holder of Shares (or other Registrable Securities (as defined
in the Registration Rights Agreement) who proposes to sell the same in
compliance with Rule 144 under the Securities Act, the Company shall (a)
promptly furnish to such holder a written statement as to its compliance with
the filing requirements of the SEC as set forth in Rule 144, as the same may be
amended from time to time, and (b) make such additional filings of reports with
the SEC as will enable the holders of Registrable Securities to make sales
thereof pursuant to such Rule. The Company shall provide its transfer agent with
appropriate instructions and/or opinions of counsel in order for any restrictive
legend contained on the certificates for the Shares (or other Registrable
Securities) to be removed when appropriate and for such holders to sell,
transfer and/or dispose of the Registrable Securities in accordance with Rule
144.
 
    4.13  EXERCISE OF THE WARRANTS.  Each of the Purchasers agrees that it shall
not exercise the Warrants, in whole or in part, on or prior to December 19,
1997, PROVIDED, HOWEVER, each of the Purchasers may elect to exercise Warrants,
in whole or in part, prior to such date in the event of any proposed (a) merger
or consolidation of the Company into or with another corporation or other
entity, (b) sale or other transfer in one or more transactions of 50% or more of
the assets or earning power of the Company, (c) tender or exchange offer for
securities of the Company, (d) sale or other transfer in one or more
transactions of 20% or more of the securities of the Company, or (e)
liquidation, dissolution or winding up of the Company.
 
    4.14  ABSENCE OF MATERIAL CHANGES.  In addition to any other rights provided
by law or in the Certificate of Designations, prior to January 31, 1998, without
the prior written consent of the Purchasers holding at least 51% of the Shares
then outstanding, the Company shall not: (a) issue any stock, bonds or other
corporate securities or grant any option or issue any warrant to purchase or
subscribe for any of such securities or issue any securities convertible into
such securities, EXCLUDING, HOWEVER, options to purchase Common Stock issued to
employees of the Company in the ordinary course of business pursuant to the
Company's existing stock option plans; (b) declare or make any payment or
distribution to its stockholders with respect to its stock, including without
limitation a stock split or stock dividend, or purchase or redeem any shares of
its capital stock; (c) reclassify any shares of its capital stock; (d) merge or
consolidate with or into any corporation or other entity, or sell all or
substantially all of its assets; or (e) commit or agree to do any of the
foregoing in the future.
 
5. LEGENDS
 
    5.1  LEGENDS.  The certificates evidencing the Preferred Stock, the
certificates evidencing the Common Stock purchased by the Purchaser at the
Second Closing and certificates evidencing any shares of Common Stock issued
upon conversion of the Preferred Stock prior to the effectiveness of the
Registration Statement and, except as hereinafter provided in this Section 5.1,
after effectiveness of the Registration Statement, will bear the following
legend (the "Legend"):
 
    THESE SECURITIES HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933
    OR ANY STATE SECURITIES LAWS. THEY MAY NOT BE SOLD OR OFFERED FOR SALE
    EXCEPT PURSUANT TO AN EFFECTIVE REGISTRATION STATEMENT AS TO THE SECURITIES
    UNDER SAID ACT AND ANY APPLICABLE STATE SECURITIES LAWS OR AN APPLICABLE
    EXEMPTION FROM SUCH REGISTRATION REQUIREMENTS.
 
    At the First Closing, the Company will issue to the transfer agent for its
Common Stock (and to any substitute or replacement transfer agent for its Common
Stock coterminous with the Company's appointment of any such substitute or
replacement transfer agent) irrevocable instructions in form and substance
reasonably satisfactory to the Purchasers. It is the intent and purpose of such
instructions to require the
 
                                        15
<PAGE>
transfer agent for the Common Stock from time to time to issue certificates
evidencing the Shares free of the Legend during the following periods and under
the following circumstances and without consultation by the transfer agent with
Company or its counsel and without the need for any further advice or
instruction to the transfer agent by or from the Company or its counsel:
 
        (a) At any time from and after the effectiveness of the Registration
    Statement, except during periods when use of the Registration Statement is
    suspended (as described in Section 7 of the Registration Rights Agreement):
 
            (i) Upon any surrender of one or more Preferred Stock certificates
       for conversion into Underlying Stock, to the extent such surrender is
       accompanied by a conversion notice requesting the issuance of
       certificates evidencing Common Stock free of the Legend and either
       containing or also accompanied by representations to the effect that the
       holder of the surrendered securities intends to effect one or more sales
       of such Shares pursuant to and in accordance with the Registration
       Statement, including the prospectus delivery requirements applicable
       thereto; and
 
            (ii) upon any surrender of one or more certificates evidencing
       Shares and which bear the Legend, to the extent accompanied by a notice
       requesting the issuance of new certificates free of the Legend to replace
       those surrendered and containing or also accompanied by representations
       by the holder of the surrendered securities to the effect of those
       described in Section 5.1(a)(i) above.
 
        (b) At any time from and after the First Closing Date, upon any
    surrender of one or more certificates evidencing Shares and which bear the
    Legend, to the extent accompanied by a notice requesting the issuance of new
    certificates free of the Legend to replace those surrendered and containing
    or also accompanied by representations that (i) the holder thereof is
    permitted to dispose thereof pursuant to Rule 144 promulgated under the
    Securities Act or (ii) the holder intends to effect the sale or other
    disposition of such securities, whether or not pursuant to the Registration
    Statement, to a purchaser or purchasers who will not be subject to the
    registration requirements of the Securities Act, or (iii) such holder is not
    then subject to such requirements.
 
    In addition, and if applicable, the Company shall reissue the Preferred
Stock, the Common Stock and the Underlying Stock without the Legend at such time
as (i) the holder thereof is permitted to dispose thereof pursuant to Rule 144
under the Securities Act or (ii) the holder intends to effect a sale thereof to
a purchaser or purchasers who will not be subject to the registration
requirements of the Securities Act, or (iii) the holder is not then subject to
such requirements.
 
    5.2  NO OTHER LEGEND OR STOCK TRANSFER RESTRICTIONS.  No legend has been or
shall be placed on the share certificates representing the Securities and no
instructions or "stop transfers," so called, "stock transfer restrictions," so
called, or other restrictions have been or shall be given to the Company's
transfer agent with respect thereto, other than as set forth in this Section 5.
 
    5.3  PURCHASER'S COMPLIANCE.  Nothing in this section shall affect in any
way the Purchasers' obligations under and agreement to comply with all
applicable securities laws upon resale of the Securities.
 
6. CHOICE OF LAW AND VENUE
 
    THIS AGREEMENT SHALL BE CONSTRUED UNDER THE LAWS OF THE STATE OF CALIFORNIA,
WITHOUT REGARD TO PRINCIPLES OF CONFLICTS OF LAW OR CHOICE OF LAW, EXCEPT TO THE
EXTENT THAT THE LAW OF THE STATE OF DELAWARE REGULATES THE COMPANY'S ISSUANCE OF
SECURITIES.
 
                                        16
<PAGE>
7. ASSIGNMENT; ENTIRE AGREEMENT; AMENDMENT
 
    7.1  ASSIGNMENT.  This Agreement may not be assigned by the Purchasers or
the Company to any other person. Notwithstanding the foregoing, the provisions
of this Agreement shall inure to the benefit of, and be enforceable by, any
assignee of a Purchaser which is a general partner of such Purchaser and by any
transferee of any of the Securities purchased or acquired by such Purchaser
hereunder with respect to the Securities held by such person or entity.
 
    7.2  ENTIRE AGREEMENT; AMENDMENT.  This Agreement, the Preferred Stock, the
Warrants, the Common Stock, the Registration Rights Agreement, the Ancillary
Agreements and the other agreements and documents delivered pursuant hereto
constitute the full and entire understanding and agreement between the parties
with regard to the subjects hereof and thereof and supersede all prior
agreements and understandings relating to such subject matter, and no party
shall be liable or bound to any other party in any manner by any warranties,
representations or covenants except as specifically set forth in this Agreement
or therein. Except as expressly provided in this Agreement, neither this
Agreement nor any term hereof may be amended, waived, discharged or terminated
other than by a written instrument signed by the party against whom enforcement
of any such amendment, waiver, discharge or termination is sought.
 
8. PUBLICITY
 
    The Company agrees that it will not disclose, and will not include in any
public announcement, the name of a Purchaser without its consent, unless and
until such disclosure is required by law or applicable regulation, and then only
to the extent of such requirement and subject to the prior review of the content
of such disclosure by each of the Purchasers.
 
9. NOTICES, ETC.; EXPENSES; INDEMNITY
 
    9.1  NOTICES.  Any notice, demand, request or other communication required
or permitted to be given by either the Company or a Purchaser pursuant to the
terms of this Agreement shall be in writing and shall be deemed to have been
duly given when delivered personally or by facsimile, with a hard copy to follow
by overnight delivery by a reputable courier:
 
        If to the Company, at 47100 Bayside Parkway, Fremont, California 94538,
    Attention: President, Facsimile No: (510) 623-4405, or at such other address
    or addresses as may have been furnished in writing by the Company to the
    Purchasers, with a copy to Andrew J. Hirsch, Esq., Wilson Sonsini Goodrich &
    Rosati, Professional Corporation, 650 Page Mill Road, Palo Alto, California
    94304, Facsimile No. (650) 493-6811; or
 
        If to a Purchaser, at its address set forth in Exhibit A, or at such
    other address or addresses as may have been furnished to the Company in
    writing by such Purchaser, with a copy to Paul P. Brountas, Esq., Hale and
    Dorr LLP, 60 State Street, Boston, Massachusetts 02109, Facsimile No: (617)
    526-5000.
 
    9.2  INDEMNIFICATION.  Each party ("Indemnifying Party") shall indemnify the
other party against any loss, liabilities, expenses, cost or damages (including
reasonable attorney's fees) incurred as a result of the Indemnifying Party's
breach of any representation, warranty, covenant or agreement in this Agreement.
In addition, if the Company fails for any reason to sell the Preferred Stock to
the Purchasers at the First Closing, the Company shall promptly pay the
Purchaser an amount equal to the Purchasers' reasonable expenses and costs
(including without limitation, reasonable attorneys' fees) incurred in
connection with this Agreement and the transactions contemplated hereby.
 
                                        17
<PAGE>
10.COUNTERPARTS
 
    This Agreement may be executed in any number of counterparts, each of which
shall be enforceable against the parties actually executing such counterparts,
and all of which together shall constitute one instrument.
 
11.SURVIVAL; SEVERABILITY
 
    The representations, warranties, covenants and agreements of the parties
hereto shall survive both the First Closing and the Second Closing. In the event
that any provision of this Agreement becomes or is declared by a court of
competent jurisdiction to be illegal, unenforceable or void, this Agreement
shall continue in full force and effect without said provision; provided that
the absence of such provision does not materially change the economic benefit of
this Agreement to any party.
 
12.TITLE AND SUBTITLES
 
    The titles and subtitles used in this Agreement are used for convenience
only and are not to be considered in construing or interpreting this Agreement.
 
    IN WITNESS WHEREOF, the parties have signed this Agreement the day and year
first written above.
 
<TABLE>
<S>                                             <C>
 
ATTEST                                          GATEFIELD CORPORATION
/s/ DOUGLAS E. KLINT                            By: /s/ JAMES R. FIEBIGER
- ---------------------------------------------
Douglas E. Klint                                --------------------------------------------
VICE PRESIDENT, GENERAL COUNSEL                    James R. Fiebiger
AND CORPORATE SECRETARY                            ITS PRESIDENT AND CHIEF EXECUTIVE OFFICER
 
                                                PURCHASERS:
                                                IDANTA PARTNERS LTD.
                                                By: /s/ DAVID J. DUNN
                                                --------------------------------------------
                                                   David J. Dunn, TRUSTEE
                                                   DUNN FAMILY TRUST
                                                   GENERAL PARTNER
 
                                                DUNN FAMILY TRUST
                                                By: /s/ DAVID J. DUNN
                                                --------------------------------------------
                                                   David J. Dunn, TRUSTEE
 
                                                PERSCILLA FAILY TRUST
                                                By: /s/ PERSCILLA FAILY
                                                --------------------------------------------
                                                   Perscilla Faily, TRUSTEE
</TABLE>
 
                                        18




<PAGE>
                                                                       EXHIBIT A
 
                               LIST OF PURCHASERS
 
<TABLE>
<CAPTION>
                                        NO. OF SHARES      NO. OF SHARES                          NO. OF SHARES
                                        OF PREFERRED      OF COMMON STOCK                        OF COMMON STOCK
                                            STOCK          ISSUABLE UPON     AGGREGATE PURCHASE  TO BE PURCHASED
                                       TO BE PURCHASED      EXERCISE OF       PRICE TO BE PAID      AT SECOND
NAME AND ADDRESS OF PURCHASER         AT FIRST CLOSING        WARRANT         AT FIRST CLOSING       CLOSING
- ------------------------------------  -----------------  ------------------  ------------------  ----------------
<S>                                   <C>                <C>                 <C>                 <C>
Idanta Partners Ltd. ...............         790,000             788,223        $  3,620,175          3,620,175
  4660 La Jolla Village Drive, Suite
  850
  San Diego, California 91222
  Attn: David J. Dunn
  Facsimile No.: (619) 452-2013
Dunn Family Trust ..................         200,000             199,550        $    916,500            916,500
  4660 La Jolla Village Drive, Suite
  850
  San Diego, California 91222
  Attn: David J. Dunn, Trustee
  Facsimile No.: (619) 452-2013
Perscilla Faily Trust ..............          10,000               9,978        $     45,825             45,825
  4660 La Jolla Village Drive, Suite
  850
  San Diego, California 91222
  Attn: Perscilla Faily, Trustee
  Facsimile No.: (619) 452-2013
                                      -----------------       ----------     ------------------  ----------------
    TOTAL...........................       1,000,000             997,751        $  4,582,500          4,582,500
                                      -----------------       ----------     ------------------  ----------------
                                      -----------------       ----------     ------------------  ----------------
</TABLE>
 
                                       A-1


<PAGE>
                                                                       EXHIBIT B
 
          THIS WARRANT AND THE SHARES OF COMMON STOCK ISSUED UPON ITS
                  EXERCISE ARE SUBJECT TO THE RESTRICTIONS ON
                TRANSFER SET FORTH IN SECTION 4 OF THIS WARRANT
 
Warrant No. ______                        Number of Shares: ____________________
                                                         (subject to adjustment)
 
Date of Issuance: November 10, 1997
 
                             GATEFIELD CORPORATION
                         COMMON STOCK PURCHASE WARRANT
                         (Void after November 10, 1999)
 
    GateField Corporation, a Delaware corporation (the "Company"), for value
received, hereby certifies that ______, or its registered assigns (the
"Registered Holder"), is entitled, subject to the terms set forth below, to
purchase from the Company, at any time or from time to time on or after the date
of issuance and on or before November 10, 1999 at not later than 5:00 p.m.
(California time), ______ shares of Common Stock, $.10 par value per share, of
the Company, at a purchase price of $1.00 per share. The shares purchasable upon
exercise of this Warrant, and the purchase price per share, each as adjusted
from time to time pursuant to the provisions of this Warrant, are hereinafter
referred to as the "Warrant Shares" and the "Purchase Price," respectively.
 
    Notwithstanding the foregoing, if (A) the stockholders of the Company
approve the proposals to be submitted to them at the 1997 Annual Meeting of
Stockholders to be held or or prior to December 19, 1997, as set forth in
Section 1.3(a)(x) of the Stock Purchase Agreement among the Company, the
Registered Holder, the Dunn Family Trust and the Perscilla Faily Trust
(collectively, the "Purchasers"), dated November 10, 1997 (the "Stock Purchase
Agreement"), and (B) the Company issues 4,582,500 shares of its Common Stock to
the Purchasers at the Second Closing (as defined the Stock Purchase Agreement),
then, and only in such event, this Warrant shall be cancelled and all of the
rights of the Registered Holder and the obligations of the Company hereunder
shall be of no further force or effect and shall terminate effective at the
later of, (i) the time such stockholder approval is so obtained and certified by
the Secretary of the Company and the amendment to the Certificate of
Incorporation of the Company so approved by the stockholders is duly filed and
recorded under the laws of the State of Delaware and (ii) the effective time of
the transactions consummated at the Second Closing (as defined in the Stock
Purchase Agreement).
 
    1.  EXERCISE.
 
    (a) This Warrant may be exercised by the Registered Holder, in whole or in
part, by surrendering this Warrant, with the purchase form appended hereto as
EXHIBIT I duly executed by such Registered Holder or by such Registered Holder's
duly authorized attorney, at the principal office of the Company, or at such
other office or agency as the Company may designate, accompanied by payment in
full, in lawful money of the United States, of the Purchase Price payable in
respect of the number of Warrant Shares purchased upon such exercise.
 
    (b) The Registered Holder may, at its option, elect to pay some or all of
the Purchase Price payable upon an exercise of this Warrant by cancelling a
portion of this Warrant exercisable for such number of Warrant Shares as is
determined by dividing (i) the total Purchase Price payable in respect of the
number of Warrant Shares being purchased upon such exercise by (ii) the excess
of the Fair Market Value per share of Common Stock as of the effective date of
exercise, as determined pursuant to subsection 1(c) below (the
 
                                       B-1
<PAGE>
"Exercise Date") over the Purchase Price per share. If the Registered Holder
wishes to exercise this Warrant pursuant to this method of payment with respect
to the maximum number of Warrant Shares purchasable pursuant to this method,
then the number of Warrant Shares so purchasable shall be equal to the total
number of Warrant Shares, minus the product obtained by multiplying (x) the
total number of Warrant Shares by (y) a fraction, the numerator of which shall
be the Purchase Price per share and the denominator of which shall be the Fair
Market Value per share of Common Stock as of the Exercise Date. The Fair Market
Value per share of Common Stock shall be determined as follows:
 
        (i) If the Common Stock is listed on a national securities exchange, the
    Nasdaq National Market, or another nationally recognized exchange or trading
    system as of the Exercise Date, the Fair Market Value per share of Common
    Stock shall be deemed to be the last reported sale price per share of Common
    Stock thereon on the Exercise Date; or, if no such price is reported on such
    date, such price on the next preceding business day (provided that if no
    such price is reported on the next preceding business day, the Fair Market
    Value per share of Common Stock shall be determined pursuant to clause
    (ii)).
 
        (ii) If the Common Stock is not listed on a national securities
    exchange, the Nasdaq National Market, or another nationally recognized
    exchange or trading system as of the Exercise Date, the Fair Market Value
    per share of Common Stock shall be deemed to be the amount most recently
    determined by the Board of Directors to represent the fair market value per
    share of the Common Stock (including without limitation a determination for
    purposes of granting Common Stock options or issuing Common Stock under an
    employee benefit plan of the Company); and, upon request of the Registered
    Holder, the Board of Directors (or a representative thereof) shall promptly
    notify the Registered Holder of the Fair Market Value per share of Common
    Stock. Notwithstanding the foregoing, if the Board of Directors has not made
    such a determination within the three-month period prior to the Exercise
    Date, then (A) the Fair Market Value per share of Common Stock shall be the
    amount next determined by the Board of Directors to represent the fair
    market value per share of the Common Stock (including without limitation a
    determination for purposes of granting Common Stock options or issuing
    Common Stock under an employee benefit plan of the Company), (B) the Board
    of Directors shall make such a determination within 15 days of a request by
    the Registered Holder that it do so, and (C) the exercise of this Warrant
    pursuant to this subsection 1(b) shall be delayed until such determination
    is made.
 
    (c) Each exercise of this Warrant shall be deemed to have been effected
immediately prior to the close of business on the day on which this Warrant
shall have been surrendered to the Company as provided in subsection 1(a) above.
At such time, the person or persons in whose name or names any certificates for
Warrant Shares shall be issuable upon such exercise as provided in subsection
1(d) below shall be deemed to have become the holder or holders of record of the
Warrant Shares represented by such certificates.
 
    (d) As soon as practicable after the exercise of this Warrant in full or in
part, and in any event within 10 days thereafter, the Company, at its expense,
will cause to be issued in the name of, and delivered to, the Registered Holder,
or as such Holder (upon payment by such Holder of any applicable transfer taxes)
may direct:
 
        (i) a certificate or certificates for the number of full Warrant Shares
    to which such Registered Holder shall be entitled upon such exercise plus,
    in lieu of any fractional share to which such Registered Holder would
    otherwise be entitled, cash in an amount determined pursuant to Section 3
    hereof; and
 
        (ii) in case such exercise is in part only, a new warrant or warrants
    (dated the date hereof) of like tenor, calling in the aggregate on the face
    or faces thereof for the number of Warrant Shares equal (without giving
    effect to any adjustment therein) to the number of such shares called for on
    the face of this Warrant minus the sum of (a) the number of such shares
    purchased by the Registered Holder
 
                                       B-2
<PAGE>
    upon such exercise plus (b) the number of Warrant Shares (if any) covered by
    the portion of this Warrant cancelled in payment of the Purchase Price
    payable upon such exercise pursuant to subsection 1(b) above.
 
    2.  ADJUSTMENTS.
 
    (a) If outstanding shares of the Company's Common Stock shall be subdivided
into a greater number of shares or a dividend in Common Stock shall be paid in
respect of Common Stock, the Purchase Price in effect immediately prior to such
subdivision or at the record date of such dividend shall simultaneously with the
effectiveness of such subdivision or immediately after the record date of such
dividend be proportionately reduced. If outstanding shares of Common Stock shall
be combined into a smaller number of shares, the Purchase Price in effect
immediately prior to such combination shall, simultaneously with the
effectiveness of such combination, be proportionately increased. When any
adjustment is required to be made in the Purchase Price, the number of Warrant
Shares purchasable upon the exercise of this Warrant shall be changed to the
number determined by dividing (i) an amount equal to the number of shares
issuable upon the exercise of this Warrant immediately prior to such adjustment,
multiplied by the Purchase Price in effect immediately prior to such adjustment,
by (ii) the Purchase Price in effect immediately after such adjustment.
 
    (b) If there shall occur any capital reorganization or reclassification of
the Company's Common Stock (other than a change in par value or a subdivision or
combination as provided for in subsection 2(a) above), or any consolidation or
merger of the Company with or into another corporation, or a transfer of all or
substantially all of the assets of the Company, then, as part of any such
reorganization, reclassification, consolidation, merger or sale, as the case may
be, lawful provision shall be made so that the Registered Holder of this Warrant
shall have the right thereafter to receive upon the exercise hereof the kind and
amount of shares of stock or other securities or property which such Registered
Holder would have been entitled to receive if, immediately prior to any such
reorganization, reclassification, consolidation, merger or sale, as the case may
be, such Registered Holder had held the number of shares of Common Stock which
were then purchasable upon the exercise of this Warrant. In any such case,
appropriate adjustment (as reasonably determined in good faith by the Board of
Directors of the Company) shall be made in the application of the provisions set
forth herein with respect to the rights and interests thereafter of the
Registered Holder of this Warrant, such that the provisions set forth in this
Section 2 (including provisions with respect to adjustment of the Purchase
Price) shall thereafter be applicable, as nearly as is reasonably practicable,
in relation to any shares of stock or other securities or property thereafter
deliverable upon the exercise of this Warrant.
 
    (c) When any adjustment is required to be made in the Purchase Price, the
Company shall promptly mail to the Registered Holder a certificate setting forth
the Purchase Price after such adjustment and setting forth a brief statement of
the facts requiring such adjustment. Such certificate shall also set forth the
kind and amount of stock or other securities or property into which this Warrant
shall be exercisable following the occurrence of any of the events specified in
subsection 2(a) or (b) above.
 
    3.  FRACTIONAL SHARES.  The Company shall not be required upon the exercise
of this Warrant to issue any fractional shares, but shall make an adjustment
therefor in cash on the basis of the Fair Market Value per share of Common
Stock, as determined pursuant to subsection 1(b) above.
 
    4.  REQUIREMENTS FOR TRANSFER.
 
    (a) This Warrant and the Warrant Shares shall not be sold or transferred
unless either (i) they first shall have been registered under the Securities Act
of 1933, as amended (the "Act"), or (ii) the Company first shall have been
furnished with an opinion of legal counsel, reasonably satisfactory to the
Company, to the effect that such sale or transfer is exempt from the
registration requirements of the Act.
 
    (b) Notwithstanding the foregoing, no registration or opinion of counsel
shall be required for (i) a transfer by a Registered Holder which is a
partnership to a partner of such partnership or a retired partner
 
                                       B-3
<PAGE>
of such partnership who retires after the date hereof, or to the estate of any
such partner or retired partner, if the transferee agrees in writing to be
subject to the terms of this Section 4, or (ii) a transfer made in accordance
with Rule 144 under the Act.
 
    (c) Each certificate representing Warrant Shares shall bear a legend
substantially in the following form:
 
       "The securities represented by this certificate have not been registered
       under the Securities Act of 1933, as amended, and may not be offered,
       sold or otherwise transferred, pledged or hypothecated unless and until
       such securities are registered under such Act or an opinion of counsel
       satisfactory to the Company is obtained to the effect that such
       registration is not required."
 
The foregoing legend shall be removed from the certificates representing any
Warrant Shares, at the request of the holder thereof, at such time as they
become eligible for resale pursuant to Rule 144(k) under the Act.
 
    5.  NO IMPAIRMENT.  The Company will not, by amendment of its charter or
through reorganization, consolidation, merger, dissolution, sale of assets or
any other voluntary action, avoid or seek to avoid the observance or performance
of any of the terms of this Warrant, but will at all times in good faith assist
in the carrying out of all such terms and in the taking of all such action as
may be necessary or appropriate in order to protect the rights of the holder of
this Warrant against impairment.
 
    6.  LIQUIDATING DIVIDENDS.  If the Company pays a dividend or makes a
distribution on the Common Stock payable otherwise than in cash out of earnings
or earned surplus (determined in accordance with generally accepted accounting
principles) except for a stock dividend payable in shares of Common Stock (a
"Liquidating Dividend"), then the Company will pay or distribute to the
Registered Holder of this Warrant, upon the exercise hereof, in addition to the
Warrant Shares purchased upon such exercise, the Liquidating Dividend which
would have been paid to such Registered Holder if he had been the owner of
record of such Warrant Shares immediately prior to the date on which a record is
taken for such Liquidating Dividend or, if no record is taken, the date as of
which the record holders of Common Stock entitled to such dividends or
distribution are to be determined.
 
    7.  NOTICES OF RECORD DATE, ETC.  In case:
 
        (a) the Company shall take a record of the holders of its Common Stock
    (or other stock or securities at the time deliverable upon the exercise of
    this Warrant) for the purpose of entitling or enabling them to receive any
    dividend or other distribution, or to receive any right to subscribe for or
    purchase any shares of stock of any class or any other securities, or to
    receive any other right; or
 
        (b) of any capital reorganization of the Company, any reclassification
    of the capital stock of the Company, any consolidation or merger of the
    Company with or into another corporation (other than a consolidation or
    merger in which the Company is the surviving entity), or any transfer of all
    or substantially all of the assets of the Company; or
 
        (c) of the voluntary or involuntary dissolution, liquidation or
    winding-up of the Company, then, and in each such case, the Company will
    mail or cause to be mailed to the Registered Holder of this Warrant a notice
    specifying, as the case may be, (i) the date on which a record is to be
    taken for the purpose of such dividend, distribution or right, and stating
    the amount and character of such dividend, distribution or right, or (ii)
    the effective date on which such reorganization, reclassification,
    consolidation, merger, transfer, dissolution, liquidation or winding-up is
    to take place, and the time, if any is to be fixed, as of which the holders
    of record of Common Stock (or such other stock or securities at the time
    deliverable upon the exercise of this Warrant) shall be entitled to exchange
    their shares of Common Stock (or such other stock or securities) for
    securities or other property deliverable upon
 
                                       B-4
<PAGE>
    such reorganization, reclassification, consolidation, merger, transfer,
    dissolution, liquidation or winding-up. Such notice shall be mailed at least
    ten (10) days prior to the record date or effective date for the event
    specified in such notice.
 
    8.  RESERVATION OF STOCK.  The Company will at all times reserve and keep
available, solely for issuance and delivery upon the exercise of this Warrant,
such number of Warrant Shares and other stock, securities and property, as from
time to time shall be issuable upon the exercise of this Warrant.
 
    9.  EXCHANGE OF WARRANTS.  Upon the surrender by the Registered Holder of
any Warrant or Warrants, properly endorsed, to the Company at the principal
office of the Company, the Company will, subject to the provisions of Section 4
hereof, issue and deliver to or upon the order of such Holder, at the Company's
expense, a new Warrant or Warrants of like tenor, in the name of such Registered
Holder or as such Registered Holder (upon payment by such Registered Holder of
any applicable transfer taxes) may direct, calling in the aggregate on the face
or faces thereof for the number of shares of Common Stock called for on the face
or faces of the Warrant or Warrants so surrendered.
 
    10.  REPLACEMENT OF WARRANTS.  Upon receipt of evidence reasonably
satisfactory to the Company of the loss, theft, destruction or mutilation of
this Warrant and (in the case of loss, theft or destruction) upon delivery of an
indemnity agreement (with surety if reasonably required) in an amount reasonably
satisfactory to the Company, or (in the case of mutilation) upon surrender and
cancellation of this Warrant, the Company will issue, in lieu thereof, a new
Warrant of like tenor.
 
    11.  TRANSFERS, ETC.
 
    (a) The Company will maintain a register containing the names and addresses
of the Registered Holders of this Warrant. Any Registered Holder may change its
or his address as shown on the warrant register by written notice to the Company
requesting such change.
 
    (b) Subject to the provisions of Section 4 hereof, this Warrant and all
rights hereunder are transferable, in whole or in part, upon surrender of this
Warrant with a properly executed assignment (in the form of EXHIBIT II hereto)
at the principal office of the Company.
 
    (c) Until any transfer of this Warrant is made in the warrant register, the
Company may treat the Registered Holder of this Warrant as the absolute owner
hereof for all purposes; PROVIDED, HOWEVER, that if and when this Warrant is
properly assigned in blank, the Company may (but shall not be obligated to)
treat the bearer hereof as the absolute owner hereof for all purposes,
notwithstanding any notice to the contrary.
 
    12.  MAILING OF NOTICES, ETC.  All notices and other communications from the
Company to the Registered Holder of this Warrant shall be mailed by first-class
certified or registered mail, postage prepaid, to the address furnished to the
Company in writing by the last Registered Holder of this Warrant who shall have
furnished an address to the Company in writing. All notices and other
communications from the Registered Holder of this Warrant or in connection
herewith to the Company shall be mailed by first-class certified or registered
mail, postage prepaid, to the Company at its principal office set forth below.
If the Company should at any time change the location of its principal office to
a place other than as set forth below, it shall give prompt written notice to
the Registered Holder of this Warrant and thereafter all references in this
Warrant to the location of its principal office at the particular time shall be
as so specified in such notice.
 
    13.  NO RIGHTS AS STOCKHOLDER.  Until the exercise of this Warrant, the
Registered Holder of this Warrant shall not have or exercise any rights by
virtue hereof as a stockholder of the Company.
 
    14.  CHANGE OR WAIVER.  Any term of this Warrant may be changed or waived
only by an instrument in writing signed by the party against which enforcement
of the change or waiver is sought.
 
    15.  HEADINGS.  The headings in this Warrant are for purposes of reference
only and shall not limit or otherwise affect the meaning of any provision of
this Warrant.
 
                                       B-5
<PAGE>
    16.  GOVERNING LAW.  This Warrant will be governed by and construed in
accordance with the laws of the State of California.
 
                                          GATEFIELD CORPORATION
 
                                          By:
 
                                            ------------------------------------
 
                                              James R. Fiebiger
                                            ITS PRESIDENT AND CHIEF EXECUTIVE
                                              OFFICER
 
ATTEST
 
- ---------------------------------------------
 
Douglas E. Klint
VICE PRESIDENT, GENERAL COUNSEL
AND CORPORATE SECRETARY
 
                                       B-6


<PAGE>
                                                                       EXHIBIT C
 
                                    TERMS OF
                         CERTIFICATE OF DESIGNATION OF
                      SERIES B CONVERTIBLE PREFERRED STOCK
                                       OF
                             GATEFIELD CORPORATION
 
    One million (1,000,000) shares of the authorized and unissued Preferred
Stock of the Corporation are hereby designated "Series B Convertible Preferred
Stock" (the "Series B Preferred Stock") with the following rights, preferences,
powers, privileges and restrictions, qualifications and limitations.
 
    1.  DIVIDENDS.
 
    (a) The holders of shares of Series B Preferred Stock shall be entitled to
receive dividends of $0.137475 per share per annum (subject to appropriate
adjustment in the event of any stock dividend, stock split, combination or other
similar recapitalization affecting such shares), payable when and as declared by
the Board of Directors of the Corporation. The right to receive dividends on
Series B Preferred Stock shall accrue and shall be cumulative from the date of
issuance of each share of Series B Preferred Stock, whether or not declared.
 
    (b) The Corporation shall not declare or pay any distributions (as defined
below) on shares of Common Stock until the holders of the Series B Preferred
Stock then outstanding shall have first received a distribution at the rate
specified in paragraph (a) of this Section 1.
 
    (c) For purposes of this Section 1, unless the context requires otherwise,
"distribution" shall mean the transfer of cash or property without
consideration, whether by way of dividend or otherwise, payable other than in
Common Stock or other securities of the Corporation, or the purchase or
redemption of shares of the Corporation (other than repurchases of Common Stock
held by employees or directors of, or consultants to, the Corporation upon
termination of their employment or services pursuant to agreements providing for
such repurchase at a price equal to the original issue price of such shares and
other than redemptions in liquidation or dissolution of the Corporation) for
cash or property, including any such transfer, purchase or redemption by a
subsidiary of this Corporation.
 
    2.  LIQUIDATION, DISSOLUTION OR WINDING UP; CERTAIN MERGERS, CONSOLIDATIONS
AND ASSET SALES.
 
    (a) In the event of any voluntary or involuntary liquidation, dissolution or
winding up of the Corporation, including any insolvency or bankruptcy proceeding
affecting the Company which is not dismissed within sixty (60) days of the
filing thereof, the holders of shares of Series B Preferred Stock then
outstanding shall be entitled to be paid out of the assets of the Corporation
available for distribution to its stockholders, before any payment shall be made
to the holders of Common Stock or any other class or series of stock ranking on
liquidation junior to the Series B Preferred Stock (such Common Stock and other
stock being collectively referred to as "Junior Stock") by reason of their
ownership thereof, an amount equal to the greater of (i) $9.165 per share
(subject to appropriate adjustment in the event of any stock dividend, stock
split, combination or other similar recapitalization affecting such shares),
plus any accrued and unpaid dividends, whether declared or not, or (ii) such
amount per share as would have been payable had each such share been converted
into Common Stock pursuant to Section 4 immediately prior to such liquidation,
dissolution or winding up. If upon any such liquidation, dissolution or winding
up of the Corporation the remaining assets of the Corporation available for
distribution to its stockholders shall be insufficient to pay the holders of
shares of Series B Preferred Stock the full amount to which they shall be
entitled, the holders of shares of Series B Preferred Stock and any class or
series of stock ranking on liquidation on a parity with the Series B Preferred
Stock shall share ratably in any distribution of the remaining assets and funds
of the Corporation in proportion to the respective amounts which would
 
                                       C-1
<PAGE>
otherwise be payable in respect of the shares held by them upon such
distribution if all amounts payable on or with respect to such shares were paid
in full.
 
    (b) After the payment of all preferential amounts required to be paid to the
holders of Series B Preferred Stock and any other class or series of stock of
the Corporation ranking on liquidation on a parity with the Series B Preferred
Stock, upon the dissolution, liquidation or winding up of the Corporation, the
holders of shares of Junior Stock then outstanding shall be entitled to receive
the remaining assets and funds of the Corporation available for distribution to
its stockholders.
 
    (c) In the event of any merger or consolidation of the Corporation into or
with another corporation (except one in which the holders of capital stock of
the Corporation immediately prior to such merger or consolidation continue to
hold at least 80% by voting power of the capital stock of the surviving
corporation), or the sale of all or substantially all the assets of the
Corporation, if the holders of at least 51% of the then outstanding shares of
Series B Preferred Stock so elect by giving written notice thereof to the
Corporation at least three days before the effective date of such event, then
such merger, consolidation or asset sale shall be deemed to be a liquidation of
the Corporation, and all consideration payable to the stockholders of the
Corporation (in the case of a merger or consolidation), or all consideration
payable to the Corporation, together with all other available assets of the
Corporation (in the case of an asset sale), shall be distributed to the holders
of capital stock of the Corporation in accordance with Subsections 2(a) and 2(b)
above. The Corporation shall promptly provide to the holders of shares of Series
B Preferred Stock such information concerning the terms of such merger,
consolidation or asset sale and the value of the assets of the Corporation as
may reasonably be requested by the holders of Series B Preferred Stock in order
to assist them in determining whether to make such an election. If the holders
of the Series B Preferred Stock make such an election, the Corporation shall use
its best efforts to amend the agreement or plan of merger or consolidation to
adjust the rate at which the shares of capital stock of the Corporation are
converted into or exchanged for cash, new securities or other property to give
effect to such election. The amount deemed distributed to the holders of Series
B Preferred Stock upon any such merger or consolidation shall be the cash or the
value of the property, rights or securities distributed to such holders by the
acquiring person, firm or other entity. The value of such property, rights or
other securities shall be determined in good faith by the Board of Directors of
the Corporation. If no notice of the election permitted by this Subsection (c)
is given, the provisions of Subsection 4(h) shall apply.
 
    3.  VOTING.
 
    (a) Each holder of outstanding shares of Series B Preferred Stock shall be
entitled to the number of votes equal to the number of whole shares of Common
Stock into which the shares of Series B Preferred Stock held by such holder are
then convertible (as adjusted from time to time pursuant to Section 4 hereof),
at each meeting of stockholders of the Corporation (and written actions of
stockholders in lieu of meetings) with respect to any and all matters presented
to the stockholders of the Corporation for their action or consideration. Except
as provided by law, by the provisions of Subsection 3(b) or Subsection 3(c)
below or by the provisions establishing any other series of Preferred Stock,
holders of Series B Preferred Stock and of any other outstanding series of
Preferred Stock shall vote together with the holders of Common Stock as a single
class.
 
    (b) The Corporation shall not amend, alter or repeal the preferences,
special rights or other powers of the Series B Preferred Stock so as to affect
adversely the Series B Preferred Stock, without the written consent or
affirmative vote of the holders of a majority of the then outstanding shares of
Series B Preferred Stock, given in writing or by vote at a meeting, consenting
or voting (as the case may be) separately as a class. For this purpose, without
limiting the generality of the foregoing, the authorization of any shares of
capital stock on a parity with, or with priority or preference over, the Series
B Preferred Stock as to the right to receive either dividends or amounts
distributable upon liquidation, dissolution or winding up of the Corporation
shall be deemed to affect adversely the Series B Preferred Stock.
 
                                       C-2
<PAGE>
    (c) In addition to any other rights provided by law, so long as at least
500,000 shares of Series B Preferred Stock shall be outstanding (subject to
appropriate adjustment in the event of any stock dividend, stock split,
combination or other similar recapitalization affecting such shares), the
Corporation shall not, without first obtaining the affirmative vote or written
consent of the holders of not less than 50% of the then outstanding shares of
Series B Preferred Stock:
 
        (i) Amend or repeal any provision of, or add any provision to, the
    Corporation's Certificate of Incorporation or By-laws, if such action would
    adversely affect the preferences, rights, privileges or powers of, or the
    restrictions provided for the benefit of, Series B Preferred Stock;
 
        (ii) Authorize or issue any new or existing class or classes or series
    of capital stock, excluding, however, shares of Common Stock issued (A) for
    a per share consideration greater than the Conversion Price (as defined in
    Section 4(a)), or (B) upon the exercise of options and warrants to acquire
    Common Stock which were outstanding prior to the Original Issue Date (as
    defined in Section 4(d)), other than the stock warrant to acquire Common
    Stock granted to Siemens Aktiengesellschaft ("Siemens") pursuant to Section
    5.2 of that certain License Agreement, dated as of October 22, 1997, between
    the Company and Siemens;
 
       (iii) Authorize or issue shares of stock of any class or any bonds,
    debentures, notes or other obligations convertible into or exchangeable for,
    or having rights to purchase, any shares of stock of the Corporation;
 
        (iv) Reclassify any Common Stock or any new or existing class or classes
    or series of capital stock;
 
        (v) Pay or declare any dividend or distribution on any shares of its
    capital stock (except dividends payable solely in shares of Common Stock),
    or apply any of its assets to the redemption, retirement, purchase or
    acquisition, directly or indirectly, through subsidiaries or otherwise, of
    any shares or its capital stock; or
 
        (vi) Issue any options, warrants or other securities exercisable or
    exchangeable for or convertible into shares of stock of the Corporation,
    EXCLUDING, HOWEVER, options and warrants to purchase Common Stock for a per
    share consideration (including for this purpose the consideration paid for
    any such warrants plus the consideration, if any, paid upon the acquisition
    of such shares of Common Stock) of greater than the Conversion Price (as
    defined in Section 4(a)).
 
    4.  OPTIONAL CONVERSION.  The holders of the Series B Preferred Stock shall
have conversion rights as follows (the "Conversion Rights"):
 
        (a)  RIGHT TO CONVERT.  Each share of Series B Preferred Stock shall be
    convertible, at the option of the holder thereof, at any time and from time
    to time, and without the payment of additional consideration by the holder
    thereof, into such number of fully paid and nonassessable shares of Common
    Stock as is determined by dividing $4.5825 by the Conversion Price (as
    defined below) in effect at the time of conversion. The "Conversion Price"
    shall initially be $1.00 per share or if the election is made to reduce the
    Conversion Price pursuant to the provisions of Section 5(a) hereof, $.75 per
    share. Such initial Conversion Price, and the rate at which shares of Series
    B Preferred Stock may be converted into shares of Common Stock, shall be
    subject to adjustment as provided below. In addition, any accrued and unpaid
    dividends in respect of shares of Series B Preferred Stock surrendered for
    conversion shall be convertible into such number of fully paid and
    nonassessable shares of Common Stock as is determined by dividing the
    aggregate dollar amount of such accrued and unpaid dividends by the
    Conversion Price.
 
        In the event of a notice of redemption of any shares of Series B
    Preferred Stock pursuant to Section 5 hereof, the Conversion Rights of the
    shares designated for redemption shall terminate at the close of business on
    the fifth business day preceding the date fixed for redemption, unless the
 
                                       C-3
<PAGE>
    redemption price is not paid when due, in which case the Conversion Rights
    for such shares shall continue until such price is paid in full. In the
    event of a liquidation of the Corporation, the Conversion Rights shall
    terminate at the close of business on the first full day preceding the date
    fixed for the payment of any amounts distributable on liquidation to the
    holders of Series B Preferred Stock.
 
        (b)  FRACTIONAL SHARES.  No fractional shares of Common Stock shall be
    issued upon conversion of the Series B Preferred Stock. In lieu of any
    fractional shares to which the holder would otherwise be entitled, the
    Corporation shall pay cash equal to such fraction multiplied by the then
    effective Conversion Price.
 
        (c)  MECHANICS OF CONVERSION.
 
        (i) In order for a holder of Series B Preferred Stock to convert shares
    of Series B Preferred Stock into shares of Common Stock, such holder shall
    surrender the certificate or certificates for such shares of Series B
    Preferred Stock, at the office of the transfer agent for the Series B
    Preferred Stock (or at the principal office of the Corporation if the
    Corporation serves as its own transfer agent), together with written notice
    that such holder elects to convert all or any number of the shares of the
    Series B Preferred Stock represented by such certificate or certificates.
    Such notice shall state such holder's name or the names of the nominees in
    which such holder wishes the certificate or certificates for shares of
    Common Stock to be issued. If required by the Corporation, certificates
    surrendered for conversion shall be endorsed or accompanied by a written
    instrument or instruments of transfer, in form satisfactory to the
    Corporation, duly executed by the registered holder or his or its attorney
    duly authorized in writing. The date of receipt of such certificates and
    notice by the transfer agent (or by the Corporation if the Corporation
    serves as its own transfer agent) shall be the conversion date ("Conversion
    Date"). The Corporation shall, as soon as practicable after the Conversion
    Date, issue and deliver at such office to such holder of Series B Preferred
    Stock, or to his or its nominees, a certificate or certificates for the
    number of shares of Common Stock to which such holder shall be entitled,
    together with cash in lieu of any fraction of a share.
 
        (ii) The Corporation shall at all times when the Series B Preferred
    Stock shall be outstanding, reserve and keep available out of its authorized
    but unissued stock, for the purpose of effecting the conversion of the
    Series B Preferred Stock, such number of its duly authorized shares of
    Common Stock as shall from time to time be sufficient to effect the
    conversion of all outstanding Series B Preferred Stock. Before taking any
    action which would cause an adjustment reducing the Conversion Price below
    the then par value of the shares of Common Stock issuable upon conversion of
    the Series B Preferred Stock, the Corporation will take any corporate action
    which may, in the opinion of its counsel, be necessary in order that the
    Corporation may validly and legally issue fully paid and nonassessable
    shares of Common Stock at such adjusted Conversion Price.
 
       (iii) Upon any such conversion, all accrued and unpaid dividends on the
    shares of Series B Preferred Stock surrendered for conversion shall be paid
    to the holders thereof.
 
        (iv) All shares of Series B Preferred Stock which shall have been
    surrendered for conversion as herein provided shall no longer be deemed to
    be outstanding and all rights with respect to such shares, including the
    rights, if any, to receive notices and to vote, shall immediately cease and
    terminate on the Conversion Date, except only the right of the holders
    thereof to receive shares of Common Stock in exchange therefor and payment
    of any dividends declared but unpaid thereon. Any shares of Series B
    Preferred Stock so converted shall be retired and cancelled and shall not be
    reissued, and the Corporation (without the need for stockholder action) may
    from time to time take such appropriate action as may be necessary to reduce
    the authorized Series B Preferred Stock accordingly.
 
        (v) The Corporation shall pay any and all issue and other taxes that may
    be payable in respect of any issuance or delivery of shares of Common Stock
    upon conversion of shares of Series B Preferred
 
                                       C-4
<PAGE>
    Stock pursuant to this Section 4. The Corporation shall not, however, be
    required to pay any tax which may be payable in respect of any transfer
    involved in the issuance and delivery of shares of Common Stock in a name
    other than that in which the shares of Series B Preferred Stock so converted
    were registered, and no such issuance or delivery shall be made unless and
    until the person or entity requesting such issuance has paid to the
    Corporation the amount of any such tax or has established, to the
    satisfaction of the Corporation, that such tax has been paid.
 
        (d)  ADJUSTMENT FOR STOCK SPLITS AND COMBINATIONS.  If the Corporation
    shall at any time or from time to time after the date on which a share of
    Series B Preferred Stock was first issued ("Original Issue Date") effect a
    subdivision of the outstanding Common Stock, the Conversion Price then in
    effect immediately before that subdivision shall be proportionately
    decreased. If the Corporation shall at any time or from time to time after
    the Original Issue Date combine the outstanding shares of Common Stock, the
    Conversion Price then in effect immediately before the combination shall be
    proportionately increased. Any adjustment under this paragraph shall become
    effective at the close of business on the date the subdivision or
    combination becomes effective.
 
        (e)  ADJUSTMENT FOR CERTAIN DIVIDENDS AND DISTRIBUTIONS.  In the event
    the Corporation at any time, or from time to time after the Original Issue
    Date shall make or issue, or fix a record date for the determination of
    holders of Common Stock entitled to receive, a dividend or other
    distribution payable in additional shares of Common Stock, then and in each
    such event the Conversion Price for the Series B Preferred Stock then in
    effect shall be decreased as of the time of such issuance or, in the event
    such a record date shall have been fixed, as of the close of business on
    such record date, by multiplying the Conversion Price for the Series B
    Preferred Stock then in effect by a fraction:
 
           (1) the numerator of which shall be the total number of shares of
       Common Stock issued and outstanding immediately prior to the time of such
       issuance or the close of business on such record date, and
 
           (2) the denominator of which shall be the total number of shares of
       Common Stock issued and outstanding immediately prior to the time of such
       issuance or the close of business on such record date plus the number of
       shares of Common Stock issuable in payment of such dividend or
       distribution;
 
    provided, however, if such record date shall have been fixed and such
    dividend is not fully paid or if such distribution is not fully made on the
    date fixed therefor, the Conversion Price for the Series B Preferred Stock
    shall be recomputed accordingly as of the close of business on such record
    date and thereafter the Conversion Price for the Series B Preferred Stock
    shall be adjusted pursuant to this paragraph as of the time of actual
    payment of such dividends or distributions; and provided further, however,
    that no such adjustment shall be made if the holders of Series B Preferred
    Stock simultaneously receive a dividend or other distribution of shares of
    Common Stock in a number equal to the number of shares of Common Stock as
    they would have received if all outstanding shares of Series B Preferred
    Stock had been converted into Common Stock on the date of such event.
 
        (f)  ADJUSTMENTS FOR OTHER DIVIDENDS AND DISTRIBUTIONS.  In the event
    the Corporation at any time or from time to time after the Original Issue
    Date for the Series B Preferred Stock shall make or issue, or fix a record
    date for the determination of holders of Common Stock entitled to receive, a
    dividend or other distribution payable in securities of the Corporation
    other than shares of Common Stock, then and in each such event provision
    shall be made so that the holders of the Series B Preferred Stock shall
    receive upon conversion thereof in addition to the number of shares of
    Common Stock receivable thereupon, the amount of securities of the
    Corporation that they would have received had the Series B Preferred Stock
    been converted into Common Stock on the date of such event and had they
    thereafter, during the period from the date of such event to and including
    the conversion date, retained such securities receivable by them as
    aforesaid during such period, giving application to all adjustments called
    for during such period under this paragraph with respect to the rights of
    the
 
                                       C-5
<PAGE>
    holders of the Series B Preferred Stock; and provided further, however, that
    no such adjustment shall be made if the holders of Series B Preferred Stock
    simultaneously receive a dividend or other distribution of such securities
    in an amount equal to the amount of such securities as they would have
    received if all outstanding shares of Series B Preferred Stock had been
    converted into Common Stock on the date of such event.
 
        (g)  ADJUSTMENT FOR RECLASSIFICATION, EXCHANGE, OR SUBSTITUTION.  If the
    Common Stock issuable upon the conversion of the Series B Preferred Stock
    shall be changed into the same or a different number of shares of any class
    or classes of stock, whether by capital reorganization, reclassification, or
    otherwise (other than a subdivision or combination of shares or stock
    dividend provided for above, or a reorganization, merger, consolidation, or
    sale of assets provided for below), then and in each such event the holder
    of each such share of Series B Preferred Stock shall have the right
    thereafter to convert such share into the kind and amount of shares of stock
    and other securities and property receivable upon such reorganization,
    reclassification, or other change, by holders of the number of shares of
    Common Stock into which such shares of Series B Preferred Stock might have
    been converted immediately prior to such reorganization, reclassification,
    or change, all subject to further adjustment as provided herein.
 
        (h)  ADJUSTMENT FOR MERGER OR REORGANIZATION, ETC.  In case of any
    consolidation or merger of the Corporation with or into another corporation
    or the sale of all or substantially all of the assets of the Corporation to
    another corporation (other than a consolidation, merger or sale which is
    covered by Subsection 2(c)), each share of Series B Preferred Stock shall
    thereafter be convertible (or shall be converted into a security which shall
    be convertible) into the kind and amount of shares of stock or other
    securities or property to which a holder of the number of shares of Common
    Stock of the Corporation deliverable upon conversion of such Series B
    Preferred Stock would have been entitled upon such consolidation, merger or
    sale; and, in such case, appropriate adjustment (as determined in good faith
    by the Board of Directors) shall be made in the application of the
    provisions in this Section 4 set forth with respect to the rights and
    interest thereafter of the holders of the Series B Preferred Stock, to the
    end that the provisions set forth in this Section 4 (including provisions
    with respect to changes in and other adjustments of the Conversion Price)
    shall thereafter be applicable, as nearly as reasonably may be, in relation
    to any shares of stock or other property thereafter deliverable upon the
    conversion of the Series B Preferred Stock.
 
        (i)  NO IMPAIRMENT.  The Corporation will not, by amendment of its
    Certificate of Incorporation or through any reorganization, transfer of
    assets, consolidation, merger, dissolution, issue or sale of securities or
    any other voluntary action, avoid or seek to avoid the observance or
    performance of any of the terms to be observed or performed hereunder by the
    Corporation, but will at all times in good faith assist in the carrying out
    of all the provisions of this Section 4 and in the taking of all such action
    as may be necessary or appropriate in order to protect the Conversion Rights
    of the holders of the Series B Preferred Stock against impairment.
 
        (j)  CERTIFICATE AS TO ADJUSTMENTS.  Upon the occurrence of each
    adjustment or readjustment of the Conversion Price pursuant to this Section
    4, the Corporation at its expense shall promptly compute such adjustment or
    readjustment in accordance with the terms hereof and furnish to each holder
    of Series B Preferred Stock a certificate setting forth such adjustment or
    readjustment and showing in detail the facts upon which such adjustment or
    readjustment is based. The Corporation shall, upon the written request at
    any time of any holder of Series B Preferred Stock, furnish or cause to be
    furnished to such holder a similar certificate setting forth (i) such
    adjustments and readjustments, (ii) the Conversion Price then in effect, and
    (iii) the number of shares of Common Stock and the amount, if any, of other
    property which then would be received upon the conversion of Series B
    Preferred Stock.
 
                                       C-6
<PAGE>
        (k)  NOTICE OF RECORD DATE.  In the event:
 
                (i) that the Corporation declares a dividend (or any other
           distribution) on its Common Stock payable in Common Stock or other
           securities of the Corporation;
 
                (ii) that the Corporation subdivides or combines its outstanding
           shares of Common Stock;
 
               (iii) of any reclassification of the Common Stock of the
           Corporation (other than a subdivision or combination of its
           outstanding shares of Common Stock or a stock dividend or stock
           distribution thereon), or of any consolidation or merger of the
           Corporation into or with another corporation, or of the sale of all
           or substantially all of the assets of the Corporation; or
 
                (iv) of the involuntary or voluntary dissolution, liquidation or
           winding up of the Corporation;
 
    then the Corporation shall cause to be filed at its principal office or at
    the office of the transfer agent of the Series B Preferred Stock, and shall
    cause to be mailed to the holders of the Series B Preferred Stock at their
    last addresses as shown on the records of the Corporation or such transfer
    agent, at least ten days prior to the date specified in (A) below or twenty
    days before the date specified in (B) below, a notice stating
 
       (A) the record date of such dividend, distribution, subdivision or
           combination, or, if a record is not to be taken, the date as of which
           the holders of Common Stock of record to be entitled to such
           dividend, distribution, subdivision or combination are to be
           determined, or
 
       (B) the date on which such reclassification, consolidation, merger, sale,
           dissolution, liquidation or winding up is expected to become
           effective, and the date as of which it is expected that holders of
           Common Stock of record shall be entitled to exchange their shares of
           Common Stock for securities or other property deliverable upon such
           reclassification, consolidation, merger, sale, dissolution or winding
           up.
 
    5.  REDEMPTION FOR FAILURE TO OBTAIN STOCKHOLDER APPROVAL AND EVENT OF
NONCOMPLIANCE.
 
        (a) In the event that:
 
                (i) the Corporation's stockholders do not, prior to December 19,
           1997, approve (x) an amendment to the Corporation's Certificate of
           Incorporation providing for the classification of the Board of
           Directors of the Corporation into three classes, with members of each
           class serving staggered three-year terms, and the election of one
           Director designated by the holders of Series B Preferred Stock as a
           Class II Director with an initial term of two years and one Director
           designated by the holders of Series B Preferred Stock as a Class III
           Director with an initial term of three years, (y) an amendment to the
           Company's Certificate of Incorporation providing for the increase in
           the number of shares of authorized Common Stock from 40,000,000 to
           65,000,000 and (z) the sale to Idanta Partners Ltd., the Dunn Family
           Trust and the Perscilla Faily Trust of shares of Common Stock which,
           together with the shares of Series B Preferred Stock owned by such
           entities, represent more than twenty percent (20%) of the Company's
           outstanding Common Stock (on an as-converted basis), or
 
                (ii) an Event of Noncompliance (as defined below) occurs,
 
    the holders of at least 51% of the then outstanding shares of Series B
    Preferred Stock may elect to either (A) cause the Company to redeem the
    shares of Series B Preferred Stock, in whole or in part, at a redemption
    price equal to $4.5825 per share plus accrued and unpaid dividends thereon
    (subject to adjustment for stock splits, stock dividends, combinations or
    similar recapitalizations affecting such shares) in cash for each share of
    Series B Preferred Stock then redeemed (the "Redemption Price")
 
                                       C-7
<PAGE>
    or (B) reduce the Conversion Price as to all shares of Series B Preferred
    Stock from $1.00 to $.75 per share. If the election is made to reduce the
    Conversion Price, it shall be evidenced by a written notice delivered to the
    Company by such holders and such reduction shall automatically be effective
    on the date of delivery of such notice to the Company.
 
    (b) At least fifteen (15) days prior to the date fixed by holders electing
to redeem their shares of Series B Preferred Stock ("Redeeming Holders"), for
any redemption of Series B Preferred Stock (hereinafter the "Redemption Date"),
the Redeeming Holders shall send the Corporation written notice that notifies
the Corporation of their election to redeem such shares, specifying the
Redemption Date and the number of shares to be redeemed and calling upon the
Corporation to pay the Redemption Price (such notice hereinafter referred to as
the "Redemption Notice"). On or prior to the Redemption Date, each Redeeming
Holder shall surrender his or its certificate or certificates representing such
shares to the Corporation, and thereupon the Redemption Price of such shares
shall be payable to the order of the person whose name appears on such
certificate or certificates as the owner thereof and each surrendered
certificate shall be cancelled. In the event less than all the shares
represented by any such certificate are redeemed, a new certificate shall be
issued representing the unredeemed shares. From and after the Redemption Date,
unless there shall have been a default in payment of the Redemption Price, all
rights of the holders of the Series B Preferred Stock designated for redemption
in the Redemption Notice as holders of Series B Preferred Stock of the
Corporation (except the right to receive the Redemption Price without interest
upon surrender of their certificate or certificates) shall cease with respect to
such shares, and such shares shall not thereafter be transferred on the books of
the Corporation or be deemed to be outstanding for any purpose whatsoever.
 
    (c) "Event of Noncompliance", as used herein, means any of the following:
 
        (i) Any of the representations or warranties made by the Corporation in
    the Stock Purchase Agreement between the Corporation and the purchaser of
    the Series B Preferred Stock dated November 10, 1997 ("Stock Purchase
    Agreement"), or in any certificate or financial or other written statements
    of the Corporation furnished by or on behalf of the Corporation in
    connection with the execution and delivery of the Stock Purchase Agreement
    and the closings of the purchase of the securities contemplated thereby
    shall be false or (when taken together with other information furnished by
    or on behalf of the Corporation, including reports and/or filings made with
    the Securities and Exchange Commission) misleading in any material respect
    at the time made; or
 
        (ii) The Corporation shall fail to perform or observe any covenant or
    agreement in the Stock Purchase Agreement, or any other covenant, term,
    provision, condition, agreement or obligations of the Corporation under the
    terms hereof and such failure shall continue uncured for a period of ten
    (10) business days after notice from any holder of Series B Preferred Stock
    of such failure; or
 
       (iii) The Corporation shall (i) become insolvent; (ii) admit in writing
    its inability to pay its debts generally as they mature; (iii) make a
    general assignment for the benefit of creditors or commence proceedings for
    its dissolution; or (iv) apply for or consent to the appointment of a
    trustee, liquidator or receiver for it or for a substantial part of its
    property or business; or
 
        (iv) A trustee, liquidator or receiver shall be appointed for the
    Corporation or for a substantial part of its property or business without
    its consent and shall not be discharged within sixty (60) days after such
    appointment; or
 
        (v) Any governmental agency or any court of competent jurisdiction at
    the instance of any governmental agency shall assume custody or control of
    the whole or any substantial portion of the properties or assets of the
    Corporation and shall not be dismissed within sixty (60) days thereafter; or
 
        (vi) Any money judgment, writ or warrant of attachment, or similar
    process in excess of Five Hundred Thousand Dollars ($500,000) in the
    aggregate shall be entered or filed against the Corporation or any of its
    properties or other assets and shall remain unpaid, unvacated, unbonded and
 
                                       C-8
<PAGE>
    unstayed for a period of forty-five (45) days or in any event later than ten
    (10) days prior to the date of any proposed sale thereunder; or
 
       (vii) Bankruptcy, reorganization, insolvency or liquidation proceedings
    or other proceedings, or relief under any bankruptcy law or any law for the
    relief of debt shall be instituted by or against the Corporation and, if
    instituted against the Corporation, shall not be dismissed within sixty (60)
    days after such institution or the Corporation shall by any action or answer
    approve of, consent to, or acquiesce in any such proceedings or admit to any
    material allegations of, or default in answering a petition filed in, any
    such proceeding; or
 
      (viii) If prior to full conversion or redemption of the Series B Preferred
    Stock, trading in the shares of the Common Stock on the Nasdaq National
    Market shall be suspended for a period of five (5) consecutive trading days,
    other than as a result of the suspension of trading in securities in
    general, or if such shares are delisted and not relisted on the Nasdaq
    National Market within thirty (30) days thereafter; or
 
        (ix) If the Corporation has not, if requested by the holders of Series B
    Preferred Stock to do so, in accordance with the Registration Rights
    Agreement between the Corporation and the holders of the Series B Preferred
    Stock, caused a registration statement relating to the resale of the Common
    Stock issuable upon conversion of the Series B Preferred Stock to be filed
    with the Securities and Exchange Commission and used its best efforts after
    such filing to cause said registration statement to be declared effective,
    as promptly as possible and in no event later than 60 days after request by
    such holders, by the Securities and Exchange Commission.
 
    6.  REDEMPTION FOR FAILURE TO RESERVE SUFFICIENT SHARES OF COMMON STOCK.
 
    (a) In the event that at any time after October 31, 1999 all outstanding
shares of Series B Preferred Stock cannot be fully converted into Common Stock
at any time because the Corporation has failed to reserve or otherwise provide a
sufficient number of shares of Common Stock to effect such conversion, the
holders of at least 51% of the then outstanding shares of Series B Preferred
Stock may elect to cause the Company to redeem the shares of Series B Preferred
Stock, in whole or in part, at a redemption price per share (the "Section 6
Redemption Price") equal to the greater of (i) the Redemption Price and (ii) the
result obtained by multiplying the Fair Market Value per share of Common Stock
(as defined below) by the number of shares of Common Stock into which each share
of Series B Preferred may then be converted.
 
    (b) The "Fair Market Value per share of Common Stock" shall be deemed to be
the last reported sale price per share of Common Stock on a national securities
exchange, the Nasdaq National Market, or another nationally recognized exchange
or trading system on the date immediately preceding the date of delivery of the
Section 6 Redemption Notice; or, if no such price is reported on such date, such
price on the next preceding trading day on which such price is reported.
 
    (c) Holders electing to redeem their shares of Series B Preferred Stock
pursuant to this Section 6 (the "Section 6 Redeeming Holders"), shall send the
Corporation written notice that notifies the Corporation of their election to
redeem such shares in accordance with this Section 6, specifying the date (not
less than ten days after the date of delivery of such notice) fixed by the
Section 6 Redeeming Holders for the redemption of Series B Preferred Stock
(hereinafter the "Section 6 Redemption Date"), and the number of shares to be
redeemed and calling upon the Corporation to pay the Section 6 Redemption Price
(such notice hereinafter referred to as the "Section 6 Redemption Notice").
 
    (d) On or prior to the Section 6 Redemption Date, each Section 6 Redeeming
Holder shall surrender his or its certificate or certificates representing such
shares to the Corporation, and thereupon the Section 6 Redemption Price of such
shares shall be payable to the order of the person whose name appears on such
certificate or certificates as the owner thereof and each surrendered
certificate shall be cancelled. In the event less than all the shares
represented by any such certificate are redeemed, a new certificate shall be
issued representing the unredeemed shares. From and after the Section 6
Redemption Date, unless there
 
                                       C-9
<PAGE>
shall have been a default in payment of the Section 6 Redemption Price, all
rights of the holders of the Series B Preferred Stock designated for redemption
in the Section 6 Redemption Notice as holders of Series B Preferred Stock of the
Corporation (except the right to receive the Section 6 Redemption Price without
interest upon surrender of their certificate or certificates) shall cease with
respect to such shares, and such shares shall not thereafter be transferred on
the books of the Corporation or be deemed to be outstanding for any purpose
whatsoever.
 
                                       C-10

<PAGE>

                                                           EXHIBIT 20.04
[GATEFIELD LOGO]

                                                           NEWS RELEASE

                                FOR IMMEDIATE RELEASE

CONTACT INFORMATION:                  
Charleen Locke          
GateField Corporation   
(510) 623-4451          
[email protected]

         SIEMENS AND GATEFIELD ENGAGE IN LONG-TERM STRATEGIC PARTNERSHIP
                                           
    COMPANIES JOIN FORCES TO PROVIDE REVOLUTIONARY SOLUTION TO SATISFY FUTURE 
      SYSTEM LEVEL INTEGRATION AND PROGRAMMABLE LOGIC DEVICE CUSTOMER NEEDS
                                           
                                           
MUENCHEN, GERMANY AND FREMONT, CALIF. USA-- NOVEMBER 3, 1997 -- Siemens 
Semiconductors and GateField Corporation (OTC:GATE) announced today that they 
have engaged in a long-term strategic partnership.  In a first step, Siemens 
has licensed GateField's non-volatile and reprogrammable ProASIC-TM- 
technology to be embedded into their system level integration (SLI) products 
and GateField gains access to Siemens' leading edge 0.25 micron (MU) FLASH 
technology.  The combination of this process technology and the innovative 
ProASIC architecture will allow Siemens to create reprogrammable and 
reconfigurable system-on-a-chip solutions that will improve time-to-market 
and time-to-volume standards.  It will enable GateField to introduce products 
during 1998 that will set a new industry benchmark for high density, 
performance, and price per usable gate for programmable logic devices (PLDs).

    "Integration of the embedded ProASIC technology is an essential step of 
our product and system integration strategy," said Dr. Franz Neppl, president 
of Siemens' Dataprocessing and Control Product Division.  "It gives our 
customers the capabilities of fast and early prototyping, of cost- and 
time-efficient tailoring of products to their specific requirements, or of 
quickly building their own IC-solution for their systems around our cores. 
Working with the GateField team has been very efficient, and I look forward 
to further expanding our cooperation."

                                       - MORE -


                                GATEFIELD CORPORATION
    47100 Bayside Parkway - Fremont, CA  94538-9942 - (800) 818-5052 - 
                         (510) 249-5757 - FAX (510) 623-4484
                       [email protected] - www.gatefield.com


<PAGE>
SIEMENS AND GATEFIELD ENGAGE IN LONG-TERM STRATEGIC PARTNERSHIP      Page 2
November 3, 1997

    "We are very pleased to have such a capable and competent partner as 
Siemens," added Dr. Jim Fiebiger, president and CEO of GateField Corporation. 
"We have found the Siemens team to be very good to work with.  The very 
thorough due diligence by their top notch scientists and product development 
people, resulting in their choice of GateField, validates our technology and 
underscores its superiority and sustainable competitive advantage over 
conventional PLD solutions.  This partnership dramatically accelerates 
GateField's ProASIC technology roadmap.  We are competitive today with our 
current ProASIC product offering in 0.6micron technology, but being able to 
leapfrog three process generations into 0.25micron FLASH technology will put 
GateField in a leadership position by the second half of 1998."

    As integrated circuits have become very complex and NRE (non recurring 
engineering) charges approach several hundred thousands of dollars, 
semiconductor companies are looking for solutions to accommodate design 
changes and customer adaptations in system level integration devices without 
expensive silicon re-spins.  In addition, ASIC suppliers do not want to 
supply ASICs which have volumes less than 5,000 to 10,000 units, since this 
is an unprofitable business for them.

    "System-level ASICs are the fastest growing ASIC market with estimated 
sales of $4 billion in 1997 growing to over $15 billion by the end of the 
decade," said Bryan Lewis, director and principal ASIC analyst for Dataquest. 
"Embedded reprogrammability is a clear strategic advantage for Siemens in 
targeted SLI markets.  GateField gets access to advanced manufacturing, as 
well as solid financial backing."

    One of the key success factors for system level integration is an 
efficient system design methodology, generally based on the standard ASIC 
high level design flow, that allows the designer to seamlessly combine the 
re-use of functional blocks or intellectual property (IP) and the design of 
standard cell and embedded reprogrammable logic in an ASIC or ASSP 
(application specific standard part).

                                       - MORE -

<PAGE>
SIEMENS AND GATEFIELD ENGAGE IN LONG-TERM STRATEGIC PARTNERSHIP      Page 3
November 3, 1997

    "Embedded ProASIC field programmability will be available to our 
customers by the end of 1998 within an integrated design environment offered 
through our Customer Service Organization," stated Michael Strafner, vice 
president of Siemens' Semicustom & Tools department.  "This technology 
significantly broadens our offering of standard cell library, memory blocks 
and the rich portfolio of our cores and functional blocks for efficient 
system integration on silicon."

    The agreement grants Siemens a non-exclusive license to GateField's 
embedded ProASIC technology (ProSLI-TM-) and Technology Integration Services, 
in consideration for a licensing fee paid to GateField.  Siemens has 
expressed a strong interest for further investment in GateField and has been 
granted a five (5) year stock warrant -- pending shareholder approval -- to 
purchase up to 9.9% of the Company's outstanding common stock over a period 
of 18 months.

    "This agreement is a key milestone for GateField's business development," 
commented Peter G. Feist, GateField's vice president of marketing.  "The 
validation, support and backing of Siemens Semiconductors, a $3 billion, 
world-class electronic corporation, combined with the recent transition of 
our company into GateField Corporation as a focused fabless semiconductor 
company is a tremendous credibility boost for our existing customer and 
prospective customer base.  GateField is positioned to redefine the 
programmable logic business and to create a paradigm shift in density, price 
and performance."

    The next step in this long-term strategic partnership is to extend this 
alliance into co-development of ProASIC devices with embedded Siemens' IP 
cores, enabling GateField and Siemens to address specific vertical market 
applications.

                                       - MORE -

<PAGE>
SIEMENS AND GATEFIELD ENGAGE IN LONG-TERM STRATEGIC PARTNERSHIP      Page 4
November 3, 1997

Forward-looking statements in this release are made pursuant to the safe 
harbor provisions of the Private Securities Litigation Reform Act of 1995. 
Investors are cautioned that such forward-looking statements involve risks 
and uncertainties, including, without limitation, continued acceptance of the 
Company's products, increased levels of competition, new product 
introductions and technological changes, the Company's dependence upon third 
party suppliers, intellectual property rights and other risks detailed from 
time-to-time in the Company's periodic reports filed with the Securities and 
Exchange Commission.

SIEMENS AG, SEMICONDUCTOR GROUP achieved annual sales of $3.1 billion in 
fiscal 1996 and employs over 19,000 people around the globe. It is a leading 
supplier of integrated circuits for fast-growing telecommunications, 
automotive and chipcard markets. The comprehensive product lines of Siemens 
Semiconductors also serve a wide range of customers in consumer electronics, 
data processing and automation. The company's product portfolio includes 
memory products, and discrete, power and opto semiconductors. 

GATEFIELD CORPORATION (OTC:GATE) developed the revolutionary, patented 
flash-based field programmable gate array technology and architecture upon 
which its ProASIC family of high gate count, non-volatile, reprogrammable 
products are built.  Headquarters is based at 47100 Bayside Parkway, Fremont, 
CA 94538-9942. Call 800-818-8052 or 510-249-5757 or access world-wide-web at 
http://www.gatefield.com.

                                       #  #  #
                                           
GateField, ProASIC, and ProSLI are trademarks of GateField Corporation.  All 
other trademarks are held by their respective owners.  


<PAGE>

                                                                NEWS RELEASE


                                FOR IMMEDIATE RELEASE
CONTACT INFORMATION:    
Charleen Locke     
GateField Corporation   
(510) 623-4451
[email protected]


             GATEFIELD ACQUIRES FUNDING FROM IDANTA PARTNERS, LTD.
        SUFFICIENT CAPITAL RAISED TO GROW GATEFIELD'S PROASIC BUSINESS
                                           
    FREMONT, CALIF. -- NOVEMBER 14, 1997 -- GateField-TM- Corporation 
(NASDAQ:GATE) today announced a Stock Purchase Agreement with Idanta 
Partners, Ltd. for $9,165,000.  Under the terms of the agreement, Idanta will 
purchase 1,000,000 shares of Series B convertible Preferred Stock for an 
aggregate purchase price of $4,582,500.  Each share of Preferred Stock is 
convertible into 4.5825 shares of common stock at Idanta's discretion.

    In addition, Idanta is required under the Stock Purchase Agreement to 
purchase 4,582,500 shares of common stock for an aggregate purchase price of 
$4,582,500 upon stockholder approval of Management Proposals at GateField's 
1997 Annual Meeting of Stockholder's, to be held December 15, 1997.  If the 
Stockholders do not approve the Management Proposals, Idanta will have a 
warrant to purchase 1,000,000 shares of common stock at $1.00 per share.

    "One of our main objectives was to raise funding for GateField's future 
growth," said Dr. Jim Fiebiger, GateField's president and CEO.  "We are 
extremely pleased that Idanta has chosen to invest in GateField.  Idanta is 
recognized for their posture as a long-term, value-added investor who works 
closely with the managers of their investments to enhance value.  We look 
forward to having them as long-term partners in the growth of our business." 

    Forward-looking statements in this release are made pursuant to the safe 
harbor provisions of the Private Securities Litigation Reform Act of 1995. 
Investors are cautioned that such forward-looking statements involve risks 
and uncertainties, including, without limitation, continued acceptance of the 
Company's products, increased levels of competition, new product 
introductions and technological changes, the Company's dependence upon third 
party suppliers, intellectual property rights and other risks detailed from 
time-to-time in the Company's periodic reports filed with the Securities and 
Exchange Commission.

GATEFIELD CORPORATION (NASDAQ:GATE) developed the revolutionary, patented 
FLASH-based FPGA technology and architecture upon which its ProASIC family of 
high gate count, non-volatile, reprogrammable products are built.  
Headquarters is based at 47100 Bayside Parkway, Fremont, CA 94538-9942.  
Call 800-818-8052 or 510-249-5757 or access world-wide-web at 
http://www.gatefield.com.

                                       #  #  #

GateField and ProASIC are trademarks of GateField Corporation. 

Further information on Idanta Partners, Ltd. can be found on their web site 
at http://www.idanta.com.


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