SIERRA SEMICONDUCTOR CORP
10-K/A, 1996-05-20
SEMICONDUCTORS & RELATED DEVICES
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                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                                  FORM 10-K/A-1

      |X|   Annual Report Pursuant to Section 13 or 15(d) of the Securities
            Exchange Act of 1934 for the Fiscal Year Ended December 31, 1995

      | |   Transition Report Pursuant to Section 13 or 15(b) of the Securities
            Exchange Act of 1934

                         Commission File Number 0-19084

                             ---------------------

                              SIERRA SEMICONDUCTOR
                                   CORPORATION
             (Exact name of Registrant as specified in its charter)

             CALIFORNIA                               94-2925073
  (State or other jurisdiction of        (I.R.S. Employer Identification No.)
           incorporation)
                            2075 NORTH CAPITOL AVENUE
                           SAN JOSE, CALIFORNIA 95132
          (Address of principal executive offices, including zip code)

       Registrant's telephone number, including area code: (408) 263-9300

           Securities registered pursuant to Section 12(b) of the Act:
                           Common Stock, no par value

           Securities registered pursuant to Section 12(g) of the Act:
                                      None

Indicate by check mark whether the Registrant (1) has filed all reports required
to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during
the  preceding  12 months  (or for such  shorter  period as the  Registrant  was
required  to file  such  reports),  and  (2) has  been  subject  to such  filing
requirements for the past 90 days.

                           YES X           NO
                              ---            ---

Indicate by check mark if disclosure of delinquent  filers  pursuant to Item 405
of Regulation  S-K is not contained  herein,  and will not be contained,  to the
best of Registrant's  knowledge,  in definitive proxy or information  statements
incorporated by reference in Part III of this Form 10-K or any amendment to this
Form 10-K. [ ]

The  aggregate  market  value of the voting stock held by  nonaffiliates  of the
Registrant, based upon the closing sale price of the Common Stock on January 31,
1996 as  reported  on the  Nasdaq  National  Market  System,  was  approximately
$379,064,627. Shares of Common Stock held by each executive officer and director
and by each person who owns 5% or more of the outstanding voting stock have been
excluded in that such persons may be deemed to be affiliates. This determination
of affiliate  status is not  necessarily  a conclusive  determination  for other
purposes.

         As of January 31, 1996, the Registrant had 26,764,135 shares of
                           Common Stock outstanding.

                       DOCUMENTS INCORPORATED BY REFERENCE

Parts of the  following  document are  incorporated  by reference in Part III of
this Form 10-K Report:

(1)  Proxy Statement for Registrant's 1996 Annual Meeting of Shareholders--Items
     10, 11, 12 and 13

================================================================================


<PAGE>


                                EXPLANATORY NOTE

         This  amendment  to the  Annual  Report on Form 10-K for the year ended
December  31, 1995 is being filed solely for the purpose of  submitting  revised
copies of Exhibit 10.18, 10.19(a) and 10.19(b) under Item 14(c) attached hereto.




                                       -2-

<PAGE>




                                   SIGNATURES

         Pursuant to the  requirements  of Section 13 or 15(d) of the Securities
Exchange Act of 1934, the registrant has duly caused this amendment to be signed
on its behalf by the undersigned, thereunto duly authorized.

Dated:   May 15, 1996               SIERRA SEMICONDUCTOR CORPORATION

                                    By: /S/ JAMES V. DILLER
                                        ----------------------------------------
                                        James V. Diller, Chief Executive Officer
<TABLE>

         Pursuant to the  requirements  of the Securities  Exchange Act of 1934,
this  amendment has been signed below by the following  persons on behalf of the
Registrant and in the capacities and on the dates indicated
<CAPTION>
         Name                                        Title                                 Date
-------------------------         -----------------------------------------------      ------------
<S>                               <C>                                                  <C>

/S/JAMES V. DILLER                Chairman of the Board, Chief Executive Officer       May 15, 1996
-------------------------         and Director (Principal Executive Officer)
James V. Diller                    

                                  President, Chief Operating Officer and Director      May 15, 1996
-------------------------
Richard J. Koeltl
By: /S/JAMES V. DILLER
   ----------------------
    James V. Diller
    Attorney-in-Fact

                                  Senior Vice President, Finance and Chief             May 15, 1996
-------------------------         Financial Officer (Principal Financial Officer)
Glenn C. Jones               
By: /S/JAMES V. DILLER
    ---------------------
    James V. Diller
    Attorney -in-Fact

-------------------------         Director                                              May 15, 1996
Michael L. Dionne
By: /S/JAMES V. DILLER
    --------------------
    James V. Diller
    Attorney-in-Fact

-------------------------         Director                                              May 15, 1996
Donald T. Valentine
By: /S/JAMES V. DILLER
    ---------------------
    James V. Diller
    Attorney-in-Fact

-------------------------         Director                                              May 15, 1996
Alexandre Balkanski
By: /S/JAMES V. DILLER
    ---------------------
    James V. Diller
    Attorney-in-Fact

</TABLE>


                                       -3-

<PAGE>



                                     PART IV

ITEM 14.  Exhibits, Financial Statement Schedules and Reports on Form 8-K.

      (a)     1.      Consolidated Financial Statements

         The financial  statements  (including the notes thereto)  listed in the
accompanying index to financial statements and financial statement schedules are
filed within this Annual Report on Form 10-K.

               2.       Financial Statement Schedules

         The financial  statement  schedule listed in the accompanying  index to
financial  statements  and  financial  statement  schedule is filed  within this
Annual Report on Form 10-K.

               3.       Exhibits

         The  exhibits  listed  under Item  14(c) are filed as part of this Form
10-K Annual Report.

      (b)      Reports on Form 8-K

         No  reports  on Form 8-K were  filed by the  Company  during the fourth
fiscal quarter ended December 31, 1995.


                                      -46-

<PAGE>


<TABLE>

      (c)      Exhibits

<CAPTION>

     Exhibit                                                                                         Page
     Number                                              Description                                Number
 ----------   ---------------------------------------------------------------------------------    ---------
     <S>          <C>                                                                                 <C>

      2.1         Exchange Agreement dated September 2, 1994 between Sierra and PMC.                  (D)

      2.2         Amended and Restated Shareholders Agreement dated September 2, 1994 among           (D)
                  the Shareholders of PMC-Sierra, Inc.

      2.3         Amendment to Exchange Agreement effective August 9, 1995                            (G)

      3.1         Restated Articles of Incorporation, as amended                                      (H)

      4.1         Specimen of Common Stock Certificates                                               (A)

      4.3         Terms of PMC-Sierra, Inc. Special Shares                                            (E)

     10.1B        1987 Incentive Stock Plan, as amended                                               (C)

     10.2         1991 Employee Stock Purchase plan, as amended                                       (A)

     10.4         Form of Indemnification Agreement for directors and officers                        (A)

     10.7         VTI-Sierra Software and Product Agreement dated December 11, 1984, with             (A)
                  amendments dated July 15, 1986 and June 12, 1987

     10.8         Warrants to Purchase Common Stock                                                   (A)

     10.9A*       Joint Venture Agreement dated November 17, 1987, with amendments dated 
                  April 21, 1988, March 2, 1986, January 16, 1990 and July 17, 1990

     10.9C        Technology Transfer Agreement dated November 17, 1987, as amended July 17,          (A)
                  1990

     10.9D        Technology License Agreement dated November 18, 1987, as amended July 17,           (A)
                  1990

     10.9E        International Distributor Agreement dated November 18, 1987, as amended             (A)
                  July 17, 1990

     10.11        Net Building Space Lease dated July 12, 1985, with amendments dated                 (A)
                  August 19, 1985, December 22, 1986 and June 30, 1987

     10.14*       Compass Design Automation, Inc. Software License Agreement dated                    (B)
                  December 2, 1991

     10.17        1994 Incentive Stock Plan                                                           (F)

     10.18        Deposit Agreement with Chartered Semiconductor Pte. Ltd.**                          --

     10.19(a)     Option Agreement between Sierra Semiconductor Corporation and Taiwan                --
                  Semiconductor Manufacturing Corporation**

     10.19(b)     Option Agreement between PMC-Sierra, Inc. and Taiwan Semiconductor                  --
                  Manufacturing Corporation**

     11.1         Calculation of earnings per share                                                   --

     22.1         Subsidiaries                                                                        --

     23.1         Consent of Ernst & Young LLP, Independent Auditors                                  --

     24.1         Power of Attorney                                                                   --

                                      -47-
<PAGE>
<FN>

*      Confidential Treatment has been granted as to a portion of this Exhibit.
**     Confidential Treatment has been requested as to portions of this Exhibit.
(A)    Incorporated by reference from the same-numbered Exhibit filed with the
       Registrant's Registration Statement on Form S-1 (No. 33-39406).
(B)    Incorporated by reference from the same-numbered Exhibit filed with the
       Registrant's Form 10-K Annual Report for the fiscal year ended December
       29, 1991.
(C)    Incorporated by reference from the same-numbered Exhibit filed with the
       Registrant's  Form 10-K Annual Report for the fiscal year ended January
       3, 1993.
(D)    Incorporated by reference from the same-numbered Exhibit filed with the
       Registrant's  Current  Report on Form 8-K, filed on September 16, 1994,
       as amended.
(E)    Incorporated by reference from the same-numbered Exhibit filed with the
       Registrant's Registration Statement Form S-3 (No. 33-97110).
(F)    Incorporated by reference from the same-numbered Exhibit filed with the
       Registrant's  Form 10-K Annual Report for the fiscal year ended January
       2, 1994.
(G)    Incorporated by reference from Exhibit 2.1 filed with the  Registrant's
       Current  Report on Form 8-K,  filed on September 6, 1995, as amended on
       October 6, 1995.
(H)    Incorporated  by reference from Exhibit 3.1 filed with Form 10-Q, filed
       November 16, 1995.
</FN>
</TABLE>


                                      -47-

<PAGE>

<TABLE>

                                INDEX TO EXHIBITS


<CAPTION>
   Exhibit                                                                                 Page
   Number                               Description                                        Number
--------------   ---------------------------------------------------------------------   ---------
<S>              <C>                                                                       <C>

   10.18         Deposit Agreement with Chartered Semiconductor Pte. Ltd.**                 AA

   10.19(a)      Option Agreement between Sierra Semiconductor Corporation                  BB
                 and Taiwan Semiconductor Manufacturing Corporation**

   10.19(b)      Option Agreement between PMC-Sierra, Inc. and Taiwan                       CC
                 Semiconductor Manufacturing Corporation**                                  

   11.1+         Calculation of Earnings Per Share                                          --

   22.1+         List of Subsidiaries                                                       --
                 
   23.1+         Consent of Ernst & Young LLP, Independent Auditors                         --
<FN>

**   Confidential treatment has been requested as to portions of this Exhibit.
+    Previously filed
</FN>
</TABLE>


                                      -50-



                                                                   EXHIBIT 10.18


                        CONFIDENTIAL TREATMENT REQUESTED
                        --------------------------------



                        Dated this 15 day of August 1995



                                     Between



                  CHARTERED SEMICONDUCTOR MANUFACTURING PTE LTD



                                       And



                        SIERRA SEMICONDUCTOR CORPORATION




                        ---------------------------------


                                DEPOSIT AGREEMENT

                        ---------------------------------


                                      -AA-


<PAGE>


                                DEPOSIT AGREEMENT

THIS AGREEMENT is made the 15 day of August 1995 by and between:-

(1)      CHARTERED  SEMICONDUCTOR  MANUFACTURING PTE LTD, a company incorporated
         in  Singapore  with its  registered  office at No. 2 Science Park Drive
         Singapore  Science Park,  Singapore  0511  (hereinafter  referred to as
         "CSM"); and

(2)      SIERRA SEMICONDUCTOR CORPORATION, a Company incorporated in California.
         and having its place of business at 2075 North  Capitol Avenue San Jose
         CA  95132,  United  States  of  America  (hereinafter  referred  to  as
         "Customer").

WHEREAS:

(A)      CSM  is  engaged   primarily  in  the  business  of  the   development,
         manufacturing,  assembly, marketing and selling of semiconductors, with
         its 2 wafer fabrication facilities situated in  Singapore.  CSM intends
         to establish a third wafer fabrication facility in Singapore.

(B)      Customer  desires  to deposit  certain  funds with CSM to enable CSM to
         procure increased wafer  fabrication  capacity and to make available to
         Customer  certain  wafer  manufacturing  capacity,  on  the  terms  and
         conditions of this Agreement.

IT IS HEREBY AGREED as follows:-

1.       THE DEPOSIT

1.1      In  consideration of CSM agreeing to make available to Customer certain
         wafer manufacturing capacity, Customer will deposit with CSM the sum of
         [  REDACTED  ] (the  "Deposit")  on such  dates and in such  amounts as
         specified in Annex A.

1.2      The  Deposit  shall  be  paid by  telegraphic  transfer  to an  account
         designated  by CSM and such Deposit  shall be maintained by Customer to
         the full amount of [  REDACTED  ] during the term of this Agreement.

1.3      Upon  the  expiry  of  the  term  of  this  Agreement  or  the  earlier
         termination  thereof in  accordance  with  Clause 6, CSM will return to
         Customer the Deposit,  without  interest and subject to any  deductions
         made by CSM pursuant to the terms of this Agreement


2.       CSM SUPPLY COMMITMENT

2.1      In  consideration  of  the  payment  of the  Deposit  by  Customer  and
         Customer's  maintenance of the full deposit amount of [ REDACTED ] with
         CSM, CSM will make available to Customer,  wafer manufacturing capacity
         for  8-inch  wafers  (based on 15 mask level  wafers) in each  calendar
         quarter  commencing from the fourth calendar  quarter of 1995 until the
         expiry or the earlier  termination  of the term of this  Agreement,  in
         such quantities as set out in Annex B (the "CSM Supply Commitment").

                        CONFIDENTIAL TREATMENT REQUESTED
                        --------------------------------
<PAGE>

2.2      The Parties agree that the technology mix of the CSM Supply  Commitment
         for each calendar month will be in direct  proportion to the technology
         mix of CSM's total wafer output to customers in such months.


         Example

         If CSM's  total  wafer  output in a month is 10,000  wafers and the CSM
         Supply  Commitment  to  Customer  constitutes  10% of CSM's total wafer
         output,  then the wafer capacity  committed by CSM to Customer shall be
         in the following mix:-

              CSM's Total Output                    Customer's Entitlement (10%)
              ------------------                    ----------------------------
                  5000 in 0.6um                                500
                  3000 in 0.5um                                300
                  2000 in 0.35um                               200
                  -------------                               -----
                  10,000 wafers                               1000
                  -------------                               -----

2.3      Unless  otherwise  expressly  provided in this  Agreement,  the sale of
         wafers by CSM to Customer,  the capacity of which is made  available to
         Customer  under  this  Agreement, shall be  governed  by the  terms and
         conditions  of CSM's  foundry  agreement  to be entered into by CSM and
         Customer (the "Foundry Agreement" ).

2.4      CSM  reserves  the right to adjust the pricing of wafers to be supplied
         by CSM from time to time  depending  on  prevailing  market  conditions
         and/or subject to the provisions of Clause 8.6,  Provided  however that
         CSM shall give Customer not less than 3 months' prior written notice of
         such adjustment. In any event, the price of wafers supplied to Customer
         shall be no more than [  REDACTED ] above  CSM's  pricing  for  similar
         products and processes and similar quantities available to CSM's equity
         investors.


3.       CUSTOMER LOADING COMMITMENT

3.1      Customer  agrees to place purchase orders with CSM for such quantity of
         8-inch wafers  (based on 15 mask level wafers) for delivery  during the
         calendar   quarters  set  out  in  Annex  B  (the   "Customer   Loading
         Commitment").  The  quantity  of wafers for which  orders are placed by
         Customer is hereinafter referred to as the "Customer Actual Loading".

3.2      The Customer  Actual Loading for each calendar  quarter during the term
         of the Agreement shall be equal to the Customer Loading Commitment.  In
         addition,  the month to month  variation in the Customer Actual Loading
         shall not exceed [ REDACTED ] without  the prior  written  approval  of
         CSM.

3.3      Notwithstanding  the  provisions  of Clause  3.2,  CSM  agrees to waive
         payment of  liquidated  damages  under Clause 4 if the Customer  Actual
         Loading  for any  calendar  quarter  is  in  aggregate  not  less  than
         [  REDACTED ] of the Customer Loading Commitment for that quarter.


4.       LIQUIDATED DAMAGES

4.1      The Parties  acknowledge  that in the initial period,  CSM and Customer
         would work  together  to qualify  Customer's  products  at CSM's  wafer
         fabrication facility.  Accordingly,  the provisions of Clause 4 for the

                        CONFIDENTIAL TREATMENT REQUESTED
                        --------------------------------
<PAGE>

         payment of liquidated  damages shall be effective in respect of the CSM
         Supply  Commitment and the Customer  Loading Commitment  from the first
         calendar quarter of 1997 onwards. In addition,  CSM shall not be liable
         for any  losses or  damages  whatsoever  incurred  by  Customer  Actual
         Loading for the period prior to the first calendar quarter of 1997.

4.2      In the event that the Customer Actual Loading for any calendar  quarter
         is less than [ REDACTED ] of the Customer  Loading  Commitment for that
         quarter,  Customer shall pay to CSM liquidated damages calculated based
         on the shortfall from 100% of the Customer Loading  Commitment for that
         quarter, at CSM's average selling price per wafer for such quarter. The
         formula  for  calculation  of  such  liquidated  damages  shall  be  as
         follows:-

            ASP x (Customer Loading  Commitment - Customer Actual loading) where
            ASP = CSM's average selling price per wafer for that quarter

4.3      In the event  that CSM fails to  deliver  at least [  REDACTED ] of the
         Customer  Actual  Loading for any  calendar  quarter,  CSM shall pay to
         Customer liquidated damages calculated based on the shortfall from 100%
         of the Customer  Actual  Loading,  based on CSM's average selling price
         per  wafer  for that  quarter.  The  formula  for  calculation  of such
         liquidated damages shall be as follows:-

            ASP x (Customer  Actual Loading - Actual quantity  delivered by CSM)
            where ASP = CSM's average selling price per wafer for that quarter

4.4      CSM and  Customer  agree and  acknowledge  that the  amount  payable as
         liquidated  damages  pursuant  to  Clauses  4.1  and  4.2 is a  genuine
         pre-estimate of the loss which would be suffered by the  non-defaulting
         Party  as a  consequence  of the  failure  of the  defaulting  Party to
         fulfill  its  respective  obligations  under  Clauses  2 and 3 of  this
         Agreement.

4.5      CSM and Customer each agrees that their respective liability,  in CSM's
         case to  fulfill  the  CSM  Supply  Commitment  under  Clause  2 and in
         Customer's case to fulfill the Customer Loading Commitment under Clause
         3, shall be limited to the  liability  expressly  specified in clause 4
         and that neither party shall be liable for  any  indirect,  special  or
         consequential  damages  even if such  Party had or should  have had any
         knowledge, actual or constructive, of the possibility of such damages.

5.       SET OFF AND MAINTENANCE OF DEPOSIT'

5.1      CSM shall be entitled to deduct from and set-off  against  the Deposit,
         the following sums due from Customer:-

         (a)  the amount of liquidated damages as they fall due pursuant to
              Clause 4; and

         (b)  any payment falling due and remaining unpaid under the Foundry
              Agreement.

5.2      At the end of each calendar  quarter,  CSM shall issue a written notice
         to Customer stating the amount of the liquidated damages and/or overdue
         payments  and  Customer  shall  pay  the  relevant  sum to CSM so as to
         maintain  the  Deposit at [ REDACTED  ],  within 30 days of the date of
         such notice.

5.3      CSM's right of deduction and set-off pursuant to Clause 5.2 shall be in
         addition to CSM's right to claim the aforesaid  liquidated  damages and
         overdue  payments  separately as a debt due from Customer and shall not

                        CONFIDENTIAL TREATMENT REQUESTED
                        --------------------------------
<PAGE>

         in any way prejudice  such  right or any other rights or remedies which
         CSM may have at law or in equity.


6.       TERM AND TERMINATION

6.1      The term of this Agreement  shall expire on 31 December 2000 and may be
         earlier terminated in the following events:-

         (a)      At the  Option  of CSM,  in the event  that the  amount of the
                  Deposit  falls below [ REDACTED ] and  Customer  fails to make
                  payment of the  shortfall up to [ REDACTED ] to CSM within the
                  period set out in Clause 5.2;

         (b)      At the  option  of CSM,  in the event of the  Customer  Actual
                  Loading is in aggregate less than 50% of the Customer  Loading
                  Commitment for 12 consecutive calendar months;

         (c)      At the  option of  Customer,  in the  event  that CSM fails to
                  deliver to Customer in  aggregate at least 50% of the Customer
                  Actual Loading for 12 consecutive calendar months;

         (d)     At the option of either Party, in any of the following events:-

                  (i)      the  inability of the other Party to pay its debts in
                           the normal course of business; or

                  (ii)     the  other  Party  ceasing  or  threatening  to cease
                           wholly  or  substantially  to carry on its  business,
                           otherwise than for the purpose of a reconstruction or
                           amalgamation without insolvency; or

                  (iii)    any encumbrancer taking  possession of or a receiver,
                           manager,  trustee or judicial manager being appointed
                           over  the  whole  or  any  substantial  part  of  the
                           undertaking,  property or assets of the other  Party;
                           or

                  (iv)     the  making  of an  order  by a  court  of  competent
                           jurisdiction   or the passing of a resolution for the
                           winding-up  of  the  other   Party   or  any  company
                           controlling  the other Party,  otherwise than for the
                           purpose of a reconstruction  or amalgamation  without
                           insolvency.

6.2      Termination  of the Agreement  pursuant to Clause 6.1 shall take effect
         immediately  upon the issue of a written  notice to that  effect by the
         Party  terminating the Agreement to the other.  The termination of this
         Agreement   howsoever   caused  shall  be  without   prejudice  to  any
         obligations  or rights of either Party which have accrued prior to such
         termination  and shall not affect any provision of this Agreement which
         is  expressly or by  implication  provided to come into effect on or to
         continue in effect after such termination.


7.       FORCE MAJEURE

7.1      CSM's  obligation to provide the CSM Supply  Commitment  and Customer's
         obligation to place  purchase  orders in  accordance  with the terms of
         this  Agreement  shall  be  suspended  upon the  occurrence  of a force
         majeure event such as act of God, flood,  earthquake, fire,  explosion,
         act of government, war, civil commotion, insurrection,  embargo, riots,
         lockouts, labour disputes affecting CSM or Customer as the case may be,

                        CONFIDENTIAL TREATMENT REQUESTED
                        --------------------------------
<PAGE>
         for such  period as such  force  majeure  event may  subsist.  Upon the
         occurrence of a force majeure  event,  the affected  Party shall notify
         the other Party in writing of the same and shall by subsequent  written
         notice after the cessation of such force majeure event inform the other
         Party  of  the  date  on  which  that  Party's  obligation  under  this
         Agreement shall be reinstated.

7.2      Notwithstanding  anything  in this Clause 7, upon the  occurrence  of a
         force majeure  event  affecting  either  Party,  and such force majeure
         event continues for a period  exceeding 6 consecutive  months without a
         prospect  of a cure of such  event,  the  other  Party  shall  have the
         option,  in its sole  discretion,  to terminate  this  Agreement.  Such
         termination  shall take effect  immediately  upon the written notice to
         that  effect  from the other  Party to the Party  affected by the force
         majeure event.


8.       WARRANTY AND INDEMNITY

8.1      Customer  warrants  that it has the right to use and license the use of
         the design provided by Customer and processes  provided by Customer and
         hereby  grants  to CSM  the  right  to use  the  aforesaid  design  and
         processes for the performance of its  obligations  under this Agreement
         and the Foundry Agreement.

8.2      Customer  shall  indemnify,  hold  harmless  and defend CSM against any
         claims that Customer's products or a process or design licensed from or
         otherwise  provided by Customer and used by CSM for the  performance of
         its obligations  under this Agreement is an infringement of any letters
         patent  or  other  intellectual  property  rights,  including,  without
         limitation,  any  infringement  based on  specifications  furnished  by
         Customer  or  resulting  from  the  use of  any  equipment  or  process
         specified by Customer.

8.3      CSM  shall  notify   Customer  of  any  claim  of  infringement  or  of
         commencement of any suit, action, or proceedings alleging  infringement
         of any intellectual  property rights of any third party forthwith after
         receiving  notice  thereof.  Customer  shall have the right in its sole
         discretion and at its expense to participate in the defence of any such
         claim, suit, action or proceedings and in any and all negotiations with
         respect thereto.

8.4      CSM shall  indemnify,  hold  harmless and defend  Customer  against any
         claims that the wafers  manufactured  by CSM pursuant to this agreement
         or any of CSM's manufacturing processes used by CSM for the performance
         of its  obligations  under this  Agreement  is an  infringement  of any
         letters  patent  or other  intellectual  property  rights  of any third
         party.

8.5      Customer  shall   notify  CSM  of  any  claim  of  infringement  or  of
         commencement of any suit, action, or proceedings alleging  infringement
         of any intellectual  property rights of any third party forthwith after
         receiving  notice  thereof.  CSM  shall  have  the  right  in its  sole
         discretion and at its expense to participate in the defence of any such
         claim, suit, action or proceedings and in any and all negotiations with
         respect thereto.

8.6      Customer  hereby  agrees that in the event that CSM is required to make
         any payments,  including  without  limitation,  licence fees or royalty
         payments,  to any third party in respect of any of CSM's  manufacturing
         processes used by CSM in the performance of its obligations  under this
         Agreement,  CSM shall be  entitled  to adjust the pricing of the wafers
         supplied to Customer  accordingly.  Such adjustment  shall be effective

                        CONFIDENTIAL TREATMENT REQUESTED
                        --------------------------------
<PAGE>
         upon CSM  giving to  Customer  not less than 3  months'  prior  written
         notice thereof.


9.       CONFIDENTIALITY

9.1      All  Confidential   Information  shall  be  kept  confidential  by  the
         recipient   unless  or  until  the  recipient   Party  can   reasonably
         demonstrate  that any such  Confidential  Information is, or part of it
         is, in the public domain through no fault of its own,  whereupon to the
         extent that it is in the public  domain or is required to be  disclosed
         by law this obligation shall cease. For the purposes of this Agreement,
         "Confidential  Information" shall mean all  communications  between the
         Parties,  and  all  information  and  other  materials  supplied  to or
         received  by  either of them from the other (a) prior to or on the date
         of this  Agreement  whether or not marked  confidential;  (b) after the
         date of this agreement which is marked confidential with an appropriate
         legend,  marking,  stamp or other obvious written identification by the
         disclosing  Party,  and (c) all  information  concerning  the  business
         transactions  and the  financial  arrangements  of the Parties with any
         person  with whom any of them is in a  confidential  relationship  with
         regard  to the  matter  in  question  coming  to the  knowledge  of the
         recipient.

9.2      The  Company and the  Parties  and shall take all  reasonable  steps to
         minimise  the  risk  of  disclosure  of  Confidential  Information,  by
         ensuring  that only they  themselves  and such of their  employees  and
         directors  whose  duties  will  require  them  to  possess  any of such
         information shall have access thereto,  and will be instructed to treat
         the same as confidential.

9.3      The  obligation  contained in this Clause shall endure,  even after the
         termination of this Agreement, for a period of 5 years from the date of
         receipt  of  the  Confidential   Information   except  and  until  such
         Confidential Information enters the public domain as set out above.


10.      NOTICES

10.1     Addresses

         All notices,  demands or other communications  required or permitted to
         be given or made under or in connection  with this   Agreement shall be
         in writing and shall be sufficiently  given or made (a) if delivered by
         hand or commercial  courier or (b) sent by pre-paid  registered post or
         (c) sent by legible facsimile  transmission  (provided that the receipt
         of such facsimile  transmission is confirmed and a copy thereof is sent
         immediately  thereafter by pre-paid  registered  post) addressed to the
         intended  recipient at its address or facsimile number set out below. A
         Party may from time to time  notify the others of its change of address
         or facsimile number in accordance with this Clause.

         CSM
         No. 2 Science Park Drive
         Singapore Science Park,
         Singapore 0511
         Facsimile no: (65) 777 3981
         Attn: Mr Tan Bock Seng
                  President

         Customer
         2075 North Capitol Avenue

                        CONFIDENTIAL TREATMENT REQUESTED
                        --------------------------------
<PAGE>

         San Jose , CA 95132,
         United States of America
         Facsimile no: (408) 263-1969
         Attn: Mr Jim Diller
                  Chairman

10.2     Deemed Delivery

         Any such notice,  demand or communication  shall be deemed to have been
         duly served (a) if delivered by hand or commercial  courier, or sent by
         pre-paid  registered  post, at the time of delivery;  or (b) if made by
         successfully  transmitted  facsimile  transmission,   at  the  time  of
         dispatch  (provided that the receipt of such facsimile  transmission is
         confirmed and that immediately  after such dispatch,  a copy thereof is
         sent by pre-paid registered post.


11.      WAIVER AND REMEDIES

11.1     No delay or neglect on the part of either  Party in  enforcing  against
         the  other  Party  any  term  or  condition  of  this  Agreement  or in
         exercising any right or remedy under this Agreement  shall either be or
         be deemed to be a waiver or in any way prejudice any right or remedy of
         that Party under this Agreement.

11.2     No remedy  conferred  by any of the  provisions  of this  Agreement  is
         intended  to be  exclusive  of any  other  remedy  which  is  otherwise
         available at law, in equity, by statute or otherwise and each and every
         other  remedy  shall be  cumulative  and shall be in  addition to every
         other  remedy given  hereunder or now or hereafter  existing at law, in
         equity,  by statute or  otherwise.  The  election of any one or more of
         such  remedies by either of the Parties  hereto shall not  constitute a
         waiver by such Party of the right to pursue any other available remedy.


12.      SEVERANCE

         If any provision or part of this Agreement is rendered void, illegal or
         unenforceable  in any respect  under any  enactment or rule of law, the
         validity, legality and enforceability of the remaining provisions shall
         not in any way be affected or impaired thereby.


13.      ENTIRE AGREEMENT

         This  Agreement  constitutes  the  entire  agreement  between  CSM  and
         Customer with respect to the subject matter hereof and shall  supersede
         all previous agreements and undertakings between Parties.


14.      GOVERNING LAW

         This  Agreement  shall be governed by and construed in accordance  with
         the laws of Singapore.  The Parties hereby  irrevocably  submit  to the
         non-exclusive jurisdiction of the courts of Singapore.


IN WITNESS  WHEREOF the Parties have  hereunto  entered into this  Agreement the
date first above written.

                        CONFIDENTIAL TREATMENT REQUESTED
                        --------------------------------
<PAGE>

Signed by Tan Bock Seng, President          )
CHARTERED SEMICONDUCTOR                     )
MANUFACTURING PTE LTD                       )
in presence of:-                            )        /s/ Tan Bock Seng




/s/ Choong Chan Gong

Name







Signed by Jim Diller, Chairman              )
SIERRA SEMICONDUCTOR                        )
CORPORATION                                 )
in the presence of:-                        )        /s/ Jim Diller




/s/ Alice Bata

Name

                        CONFIDENTIAL TREATMENT REQUESTED
                        --------------------------------
<PAGE>



                                     ANNEX A

                                Payment Schedule

Deposit Amount                                               [  REDACTED  ]
1.       Upon signing of Deposit Agreement                   [  REDACTED  ]
2.       2 January 1996                                      [  REDACTED  ]
3.       2 January 1997                                      [  REDACTED  ]
4.       2 January 1998                                      [  REDACTED  ]

                        CONFIDENTIAL TREATMENT REQUESTED
                        --------------------------------
<PAGE>


                                     ANNEX B

                              CSM SUPPLY COMMITMENT
                           CUSTOMER LOADING COMMITMENT

            Number of 8-inch silicon wafers (based on 15 mask level)


         4Q95     1Q96      2Q96      3Q96      4Q96      1Q97     2Q97

     [REDACTED][REDACTED][REDACTED][REDACTED][REDACTED][REDACTED][REDACTED]


         3Q97     4Q97       1Q98      2Q98      3Q98     4Q98 through 4Q2000

      [REDACTED][REDACTED][REDACTED][REDACTED][REDACTED]       [REDACTED]


                        CONFIDENTIAL TREATMENT REQUESTED
                        --------------------------------


                                                                EXHIBIT 10.19(a)


                        CONFIDENTIAL TREATMENT REQUESTED
                        --------------------------------






                                OPTION AGREEMENT


                                     Between


                           Sierra Semiconductor Corp.


                                       And


                  Taiwan Semiconductor Manufacturing Co., Ltd.

                                 March 19, 1996









                                      -BB-

<PAGE>


                                TABLE OF CONTENTS

1.       DEFINITIONS                                                    4
2.       VOLUME COMMITMENT                                              5
3.       WAFER PRICE                                                    5
4.       OTHER PURCHASE TERMS AND CONDITIONS                            6
5.       OBLIGATION TO PAY OPTION FEE FOR OPTION CAPACITY               6
6.       FAILURE TO PURCHASE THE OPTION CAPACITY                        7
7.       TERM AND TERMINATION                                           8
8.       BOARD APPROVAL                                                 9
9.       LIMITATION OF LIABILITY                                        9
10.      NOTICE                                                         9
11.      ENTIRE AGREEMENT                                              10
12.      GOVERNING LAW                                                 10
13.      ARBITRATION                                                   10
14.      ASSIGNMENT                                                    11
15.      CONFIDENTIALITY                                               11
16.      FORCE MAJEURE                                                 11
EXHIBIT A                                                              12
EXHIBIT B                                                              13
EXHIBIT C                                                              14
EXHIBIT D                                                              15
EXHIBIT E                                                              16

                        CONFIDENTIAL TREATMENT REQUESTED
                        --------------------------------
<PAGE>


                                OPTION AGREEMENT

         THIS AGREEMENT is made and becomes  effective as of March 19, 1996 (the
"Effective Date") by Taiwan  Semiconductor  Manufacturing Co., Ltd. ("TSMC"),  a
company  organized  under the laws of the Republic of China with its  registered
address at No. 121, Park Ave. 3, Science-Based Industrial Park, Hsinchu, Taiwan,
and,  SIERRA  SEMICONDUCTOR,  INC.,  a  company  organized  under  the  laws  of
California,  with its registered address at 2075 N. Capital Avenue, San Jose, CA
95132 ("Customer").

RECITALS

         WHEREAS,  TSMC  currently  supplies  Customer  with wafers and Customer
wishes to increase the volume of wafers to be purchased from TSMC;

         WHEREAS, in order to increase its output, [  REDACTED  ]

         WHEREAS,  as a condition to TSMC's  acceleration  of these  facilities,
TSMC has asked that Customer make a capacity  commitment and advance payment for
the right to buy additional capacity, and Customer is willing to do so:

AGREEMENT

         NOW, THEREFORE, in consideration of the mutual covenants and conditions
contained herein, the parties agree as follows:


                                       3

                        CONFIDENTIAL TREATMENT REQUESTED
                        --------------------------------
<PAGE>

1.       DEFINITIONS

         (a)      "Base Capacity" used in this Agreement shall mean the Contract
                  Capacity as defined in this Section 1 (c) below, plus the Best
                  Effort Capacity as defined in this Section 1 (c) below.

         (b)      "Best Effort  Capacity" used in this Agreement  shall mean the
                  capacity  commitment made by Customer on the best effort basis
                  pursuant to an existing agreement, if any.

         (c)      "Customer  Committed  Capacity" used this Agreement shall mean
                  the total capacity that Customer  agrees to purchase from TSMC
                  pursuant to this Agreement, and is set forth in Exhibit B.

         (d)      "Option  Capacity" used in this Agreement  shall mean the firm
                  capacity   commitment  made  by  Customer   pursuant  to  this
                  Agreement,  for  which  Capacity  Customer  agrees  to pay the
                  Option Fee as defined in this Section 1(f) below.

         (e)      "Option  Fee" used in this  Agreement  shall mean the  deposit
                  that Customer agrees to place with TSMC as the advance payment
                  for the Option Capacity.

         (f)      "TSMC  Committed  Capacity" used in this Agreement  shall mean
                  the total  capacity  that TSMC  agrees to provide to  Customer
                  pursuant to this Agreement, and is set forth in Exhibit B.

         (g)      [  REDACTED  ]


                                       4

                        CONFIDENTIAL TREATMENT REQUESTED
                        --------------------------------
<PAGE>

2.       VOLUME COMMITMENT

         (a)      Customer  agrees to purchase from TSMC the Customer  Committed
                  Capacity,  and  subject  to the  payment  of the Option Fee by
                  Customer  under  Section 5 below,  TSMC  agrees to  provide to
                  Customer the TSMC Committed Capacity,  as set forth in Exhibit
                  B. [  REDACTED  ]

         (b)      Each  month,  Customer  agrees to provide to TSMC a  six-month
                  rolling  forecast of the number of wafers that  Customer  will
                  purchase,[  REDACTED ]. The  forecast  must be based on wafers
                  out or deliveries expected to be made by TSMC.

         (c)      TSMC  will use its  reasonable  effort to cause its fabs to be
                  capable of producing  wafers of more advanced  specifications,
                  as set  forth in the TSMC  Technology  Road  Map  attached  as
                  Exhibit C.

3.       WAFER PRICE

         (a)      The  wafer  prices for the Customer  Committed  Capacity shall
                  [REDACTED] for  the same technology, the same fab and the same
                  period of time.  In the event  that the wafer  prices  for the
                  Customer  Committed  Capacity do not comply with the preceding
                  sentence, TSMC will make proper price changes for the unfilled
                  orders, upon Customer's notice in writing.


                                       5

                        CONFIDENTIAL TREATMENT REQUESTED
                        --------------------------------
<PAGE>

         (b)      The parties shall  negotiate in good faith each year the wafer
                  prices for the Customer  Committed  Capacity of the  following
                  year, [  REDACTED  ]

4.       OTHER PURCHASE TERMS AND CONDITIONS

         The  Customer/TSMC  Foundry Wafer  Agreement dated to be completed will
         apply to all purchases of wafers by Customer from TSMC, except that the
         provisions of this Agreement  will  supersede the above  Agreement with
         respect to the subject matter hereof.

5.       OBLIGATION TO PAY OPTION FEE FOR OPTION CAPACITY

         (a)      Customer agrees to pay to TSMC the Option Fee in the amount of
                  [ REDACTED  ] for the right to  purchase  the Option  Capacity
                  pursuant  to this  Agreement.  The  Option Fee is set forth in
                  Exhibit  D.  Except  that TSMC  exercises  its first  right of
                  refusal and accepts the Customer's offer pursuant to Section 6
                  below,  the Option Fee for any calendar year, once paid, shall
                  be non-refundable for any cause other than breach, and will be
                  credited  against  the wafer  prices for the  Option  Capacity
                  provided  by  TSMC  for  that   particular   year  under  this
                  Agreement.

         (b)      Customer  further agrees to deliver to TSMC,  within seven (7)
                  days following the Effective  Date,  two (2) promissory  notes
                  each in an amount of the Option  Fee due  and  payable to TSMC
                  which  promissory  notes  are in the  form of  Exhibit  E. The
                  promissory  notes shall be returned by TSMC to Customer within
                  seven (7) days upon receipt of the corresponding Option Fee by
                  TSMC.


                                       6

                        CONFIDENTIAL TREATMENT REQUESTED
                        --------------------------------
<PAGE>

6.       FAILURE TO PURCHASE THE OPTION CAPACITY; FIRST RIGHT OF REFUSAL



         (a)      [  REDACTED  ]


         (b)      Customer may assign its TSMC Committed  Capacity to PMC-Sierra
                  Corporation.

         (c)      Any of  Customer's  right or  obligation  set forth in Section
                  6(a)  shall not affect  its  obligation  to pay the Option Fee
                  pursuant to Section 5 above,  except that if this Agreement is
                  assigned to any third  parties  acceptable to TSMC pursuant to
                  this  Section  6(a) above,  such third  parties  shall pay the
                  Option  Fee and  abide by the  terms  and  conditions  of this
                  Agreement.


                                       7

                        CONFIDENTIAL TREATMENT REQUESTED
                        --------------------------------
<PAGE>

7.       TERM AND TERMINATION

         (a)      The term of this  Agreement  shall commence from the Effective
                  Date, and continue until December 31, 2000.

         (b)      TERMINATION BY TSMC FOR  CUSTOMER'S  FAILURE TO PAY THE OPTION
                  FEE TSMC may terminate this Agreement if Customer fails to pay
                  the Option Fee  pursuant to Section 5 above, and does not cure
                  or remedy such  breach  within  thirty (30) days of  receiving
                  written notice of such breach.

         (c)      TERMINATION FOR OTHER BREACH OR FOR BANKRUPTCY
                  Either party may terminate  this Agreement if, the other party
                  breaches any material provisions of this Agreement (other than
                  the  breach of  Section 5 above),  and does not cure or remedy
                  such breach within sixty (60) days of receiving written notice
                  of such breach,  or (ii) becomes the subject of a voluntary or
                  involuntary  petition in bankruptcy or any proceeding relating
                  to insolvency,  receivership or liquidation,  if such petition
                  or  proceeding is not dismissed  with  prejudice  within sixty
                  (60) days after filing.

         (d)      EFFECT OF TERMINATION
                  Both parties  shall  remain  liable to the other party for any
                  outstanding  and matured rights and obligations at the time of
                  termination,  including all outstanding payments of the Option
                  Fee and for the  wafers  already  ordered  and/or  shipped  to
                  Customer.

                  In addition,  if this  Agreement is terminated by Customer due
                  to a breach by TSMC,  then TSMC shall  refund to Customer  any
                  portion of the Option Fee already paid by Customer to TSMC but
                  not  yet  credited  to  the  purchase   prices  of  wafers  in
                  accordance with Section 5 above.


                                       8

                        CONFIDENTIAL TREATMENT REQUESTED
                        --------------------------------
<PAGE>



8.       BOARD APPROVAL


         Customer  shall  obtain the  approval by its Board of Directors of this
         Agreement, and submit to TSMC, at the time of executing this Agreement,
         an   authentic   copy  of  it's  board   resolution   authorizing   the
         representative designated below to execute this Agreement.


9.       LIMITATION OF LIABILITY

         In no event shall  either  party be liable for any  indirect,  special,
         incidental or consequential damages (including loss of profits and loss
         of use)  resulting  from,  arising out of or in connection  with either
         party's  performance  or failure to perform  under this  Agreement,  or
         resulting  from,  arising out of or in connection  with either  party's
         producing,  supplying,  and/or  sale of the  wafers,  whether  due to a
         breach of contract, breach of warranty, tort, negligence, or otherwise.

10.      NOTICE

         All notices  required or  permitted  to be sent by either  party to the
         other  party  under this  Agreement  shall be sent by  registered  mail
         postage prepaid,  or by personal delivery,  or by fax. Any notice given
         by fax shall be  followed  by a  confirmation  copy  within  (10) days.
         Unless  changed by written  notice  given by either party to the other,
         the  addresses  and fax numbers of the  respective  parties shall be as
         follows:

To TSMC:

TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY, LTD.
No. 121, Park Avenue 3
Science-Based Industrial Park
Hsinchu, Taiwan
Republic of China          FAX: 886-35-781545


                                       9

                        CONFIDENTIAL TREATMENT REQUESTED
                        --------------------------------
<PAGE>

To Customer:
SIERRA SEMICONDUCTOR, INC,
2075 N. Capital Avenue
San Jose, CA 95132         FAX: 408-946-7523

11.      ENTIRE AGREEMENT

         This Agreement including Exhibits A-E, constitutes the entire agreement
         between the parties  with  respect to the subject  matter  hereof,  and
         supersedes  and replaces all prior or  contemporaneous  understandings,
         agreements,  dealings and negotiations,  oral or written, regarding the
         subject matter hereof. No modification, alteration or amendment of this
         Agreement  shall be  effective  unless in  writing  and  signed by both
         parties.  No waiver of any breach or failure by either party to enforce
         any provision of this  Agreement  shall be deemed a waiver of any other
         or subsequent  breach, or a waiver of future enforcement of that or any
         other provision.

l2.      GOVERNING LAW

         This Agreement will be governed by and  interpreted in accordance  with
         the laws of the Republic of China.

13.      ARBITRATION

         Each party will make best  efforts to resolve  amicably any disputes or
         claims  under this  Agreement  among the  parties.  In the event that a
         resolution  is not reached  among the parties  within  thirty (30) days
         after written notice by any party of the dispute or claim,  the dispute
         or claim  shall be finally  settled by  binding  arbitration  in Taipei
         under The Rules of Arbitration of the International Chamber of Commerce
         by three (3) arbitrators  appointed in accordance with such rules.  The
         arbitration  proceeding shall be conducted in English.  Judgment on the
         award  rendered by the  arbitrator  may be entered in any court  having
         jurisdiction thereof.


                                       10

                        CONFIDENTIAL TREATMENT REQUESTED
                        --------------------------------
<PAGE>

14.      ASSIGNMENT

         This  Agreement  shall be binding  on and inure to the  benefit of each
         party and its  successors,  and except  that  Customer  may assign this
         Agreement under Section 6 above,  neither party shall assign any of its
         rights hereunder,  nor delegate its obligations hereunder, to any third
         party, without the prior written consent of the other.

15.      CONFIDENTIALITY

         Neither  party  shall  disclose  the  existence  or  contents  of  this
         Agreement except as required by Customer's assignment of this Agreement
         to any third parties  pursuant to Section 6 above, in confidence to its
         advisers, as required by applicable law, or otherwise without the prior
         written consent of the other party.

16.      FORCE MAJEURE

         Neither party shall be responsible for delays or failure in performance
         resulting from acts beyond the reasonable  control of such party.  Such
         acts shall  include but not limited to acts of God,  war,  riot,  labor
         stoppages, governmental actions, fires, floods, and earthquakes.


         IN WITNESS WHEREOF, the parties, have executed this Agreement as of the
date first stated above.


         TAIWAN SEMICONDUCTOR                     SIERRA SEMICONDUCTOR, INC.
         MANUFACTURING CO., LTD.



         BY:____________________                  BY:____________________
         Donald Brooks                            James V. Diller
         President                                CEO


                                       11

                        CONFIDENTIAL TREATMENT REQUESTED
                        --------------------------------
<PAGE>



                                    EXHIBIT A
                              CAPACITY FACTOR TABLE

                                 [TABLE OMITTED]







                                       12

                        CONFIDENTIAL TREATMENT REQUESTED
                        --------------------------------
<PAGE>



                                    EXHIBIT B
                         SIERRA SEMICONDUCTOR, INC./TSMC
                               COMMITTED CAPACITY

                                 [TABLE OMITTED]







                                       13

                        CONFIDENTIAL TREATMENT REQUESTED
                        --------------------------------
<PAGE>



                                    EXHIBIT C
                          TSMC CMOS Technology Roadmap

                                 [TABLE OMITTED]







                                       14

                        CONFIDENTIAL TREATMENT REQUESTED
                        --------------------------------
<PAGE>



                                    EXHIBIT D
                              OPTION FEE (Option I)

         Year              Option Capacity          Option Fee        Due Date
                           (Unit: Wafer             (Unit: US$)
                           Equivalent)

    [  REDACTED  ]         [  REDACTED  ]         [  REDACTED  ]  [  REDACTED  ]


                           [  REDACTED  ]         [  REDACTED  ]  [  REDACTED  ]


                                       15

                        CONFIDENTIAL TREATMENT REQUESTED
                        --------------------------------
<PAGE>

                                    EXHIBIT E
                        STANDARD FORM OF PROMISSORY NOTE



Amount: US $______________   Due Date:_______________



         The Undersigned,  ____________________  (the "Maker"),  unconditionally
promise to pay to Taiwan Semiconductor  Manufacturing Co., Ltd. or its order the
[ REDACTED ]  annum on any unpaid portion of the principal amount stated herein,
and said payment will be made at _______________ (Place of Payment).

         This Note shall be governed in all respects by the laws of the Republic
of China.

         The Maker of this Note agrees to waive  protests and notice of whatever
kind.

Issue Date:       ________________________

Issue Place:      ________________________


                                 Maker's Signature: ________________________


                                 Maker's Address:   ________________________

                                                    ________________________
                                                                 

                                       16

                        CONFIDENTIAL TREATMENT REQUESTED
                        --------------------------------

                                                                EXHIBIT 10.19(b)



                        CONFIDENTIAL TREATMENT REQUESTED
                        --------------------------------


                                OPTION AGREEMENT


                                     Between


                                PMC-Sierra, Inc.


                                       And


                  Taiwan Semiconductor Manufacturing Co., Ltd.

                                 March 19, 1996


                                      -CC-
<PAGE>


                                TABLE OF CONTENTS

1.       DEFINITIONS                                                    4
2.       VOLUME COMMITMENT                                              5
3.       WAFER PRICE                                                    5
4.       OTHER PURCHASE TERMS AND CONDITIONS                            6
5.       OBLIGATION TO PAY OPTION FEE FOR OPTION CAPACITY               6
6.       FAILURE TO PURCHASE THE OPTION CAPACITY                        7
7.       TERM AND TERMINATION                                           8
8.       BOARD APPROVAL                                                 8
9.       LIMITATION OF LIABILITY                                        9
10.      NOTICE                                                         9
11.      ENTIRE AGREEMENT                                              10
12.      GOVERNING LAW                                                 10
13.      ARBITRATION                                                   10
14.      ASSIGNMENT                                                    11
15.      CONFIDENTIALITY                                               11
16.      FORCE MAJEURE                                                 11
EXHIBIT A                                                              12
EXHIBIT B                                                              13
EXHIBIT C                                                              14
EXHIBIT D                                                              15
EXHIBIT E                                                              16

                        CONFIDENTIAL TREATMENT REQUESTED
                        --------------------------------
<PAGE>

                                OPTION AGREEMENT

         THIS AGREEMENT is made and becomes  effective as of March 19, 1996 (the
"Effective Date") by Taiwan  Semiconductor  Manufacturing Co., Ltd. ("TSMC"),  a
company  organized  under the laws of the Republic of China with its  registered
address at No. 121, Park Ave. 3, Science-Based Industrial Park, Hsinchu, Taiwan,
and, PMC-SIERRA  CORPORATION,  a company organized under the laws of California,
with its registered address at 8501 Commerce Court,  Burnaby, B.C. Canada V5A4N3
("Customer").

RECITALS

         WHEREAS,  TSMC  currently  supplies  Customer  with wafers and Customer
wishes to increase the volume of wafers to be purchased from TSMC;

         WHEREAS, in order to increase its output, TSMC [ REDACTED ]

         WHEREAS,  as a condition to TSMC's  acceleration  of these  facilities,
TSMC has asked that Customer make a capacity  commitment and advance payment for
the right to buy additional capacity, and Customer is willing to do so:

AGREEMENT

         NOW, THEREFORE, in consideration of the mutual covenants and conditions
contained herein, the parties agree as follows:


                                       3

                        CONFIDENTIAL TREATMENT REQUESTED
                        --------------------------------
<PAGE>

1.       DEFINITIONS

         (a)      "Base Capacity" used in this Agreement shall mean the Contract
                  Capacity as defined in this Section 1(c) below,  plus the Best
                  Effort Capacity as defined in this Section 1(c) below.

         (b)      "Best Effort  Capacity" used in this Agreement  shall mean the
                  capacity  commitment made by Customer on the best effort basis
                  pursuant to an existing agreement, if any.

         (c)      "Customer   Committed  Capacity"  used  this  Agreement  shall
                  mean the total capacity that Customer  agrees to purchase from
                  TSMC pursuant to this  Agreement,  and is set forth in Exhibit
                  B.

         (d)      "Option  Capacity" used in this Agreement  shall mean the firm
                  capacity   commitment  made  by  Customer   pursuant  to  this
                  Agreement,  for  which  Capacity  Customer  agrees  to pay the
                  Option Fee as defined in this Section 1(f) below.

         (e)      "Option  Fee" used in this  Agreement  shall mean the  deposit
                  that Customer agrees to place with TSMC as the advance payment
                  for the Option Capacity.

         (f)      "TSMC  Committed  Capacity" used in this Agreement  shall mean
                  the total  capacity  that TSMC  agrees to provide to  Customer
                  pursuant to this Agreement, and is set forth in Exhibit B.

         (g)      [ REDACTED ]


                                       4

                        CONFIDENTIAL TREATMENT REQUESTED
                        --------------------------------
<PAGE>


2.       VOLUME COMMITMENT

         (a)      Customer  agrees to purchase from TSMC the Customer  Committed
                  Capacity,  and  subject  to the  payment  of the Option Fee by
                  Customer  under  Section 5 below,  TSMC  agrees to  provide to
                  Customer the TSMC Committed Capacity,  as set forth in Exhibit
                  B. [ REDACTED ]

         (b)      Each  month,  Customer  agrees to provide to TSMC a  six-month
                  rolling  forecast of the number of wafers that  Customer  will
                  purchase [ REDACTED  ]. The  forecast  must be based on wafers
                  out or deliveries expected to be made by TSMC.

         (c)      TSMC  will use its  reasonable  effort to cause its fabs to be
                  capable of producing  wafers of more advanced  specifications,
                  as set  forth in the TSMC  Technology  Road  Map  attached  as
                  Exhibit C.

3.       WAFER PRICE

         (a)      The wafer prices for the  Customer  Committed  Capacity  shall
                  [ REDACTED ] technology,  the same fab and the same  period of
                  time.  In the event  that the wafer  prices  for the  Customer
                  Committed Capacity do not comply with the preceding  sentence,
                  TSMC will make proper price  changes for the unfilled  orders,
                  upon Customer's notice in writing.

         (b)      The parties shall  negotiate in good faith each year the wafer
                  prices for the Customer  Committed  Capacity of the  following
                  year, [ REDACTED ].


                                       5

                        CONFIDENTIAL TREATMENT REQUESTED
                        --------------------------------
<PAGE>

4.       OTHER PURCHASE TERMS AND CONDITIONS

         The Customer/TSMC  Foundry Wafer Agreement dated (to be completed) will
         apply to all purchases of wafers by Customer from TSMC, except that the
         provisions of this Agreement  will  supersede the above  Agreement with
         respect to the subject matter hereof.

5.       OBLIGATION TO PAY OPTION FEE FOR OPTION CAPACITY

         (a)      Customer agrees to pay to TSMC the Option Fee in the amount of
                  US$280 [ REDACTED ]  for the  right  to  purchase  the  Option
                  Capacity  pursuant  to this  Agreement.  The Option Fee is set
                  forth in Exhibit D. Except that TSMC exercises its first right
                  of refusal  and  accepts  the  Customer's  offer  pursuant  to
                  Section 6 below,  the Option Fee for any calendar  year,  once
                  paid, shall be non-refundable for any cause other than breach,
                  and will be credited  against the wafer  prices for the Option
                  Capacity  provided by TSMC for that particular year under this
                  Agreement.

         (b)      Customer  further agrees to deliver to TSMC,  within seven (7)
                  days following the Effective  Date,  two (2) promissory  notes
                  each in an amount of the Option  Fee due and   payable to TSMC
                  which  promissory  notes  are in the  form of  Exhibit  E. The
                  promissory  notes shall be returned by TSMC to Customer within
                  seven (7) days upon receipt of the corresponding Option Fee by
                  TSMC.


                                       6

                        CONFIDENTIAL TREATMENT REQUESTED
                        --------------------------------
<PAGE>

6.       FAILURE TO PURCHASE THE OPTION CAPACITY; FIRST RIGHT OF REFUSAL


         (a)      [ REDACTED ]

         (b)      Customer  may assign  its TSMC  Committed  Capacity  to Sierra
                  Semiconductor, Inc.

         (c)      Any of  Customer's  right or  obligation  set forth in Section
                  6(a)  shall not affect  its  obligation  to pay the Option Fee
                  pursuant to Section 5 above,  except that if this Agreement is
                  assigned to any third  parties  acceptable to TSMC pursuant to
                  this  Section  6(a) above,  such third  parties  shall pay the
                  Option  Fee and  abide by the  terms  and  conditions  of this
                  Agreement.


                                       7

                        CONFIDENTIAL TREATMENT REQUESTED
                        --------------------------------
<PAGE>

7.       TERM AND TERMINATION

         (a)      The term of this  Agreement  shall commence from the Effective
                  Date, and continue until December 31, 2000.

         (b)      TERMINATION BY TSMC FOR  CUSTOMER'S  FAILURE TO PAY THE OPTION
                  FEE TSMC may terminate this Agreement if Customer fails to pay
                  the Option Fee pursuant to Section 5 above,  and does not cure
                  or remedy such  breach  within  thirty (30) days of  receiving
                  written notice of such breach.

         (c)      TERMINATION FOR OTHER BREACH OR FOR BANKRUPTCY
                  Either party may terminate  this Agreement if, the other party
                  breaches any material provisions of this Agreement (other than
                  the  breach of  Section 5 above),  and does not cure or remedy
                  such breach within sixty (60) days of receiving written notice
                  of such breach,  or (ii) becomes the subject of a voluntary or
                  involuntary  petition in bankruptcy or any proceeding relating
                  to insolvency,  receivership or liquidation,  if such petition
                  or  proceeding is not dismissed  with  prejudice  within sixty
                  (60) days after filing.

         (d)      EFFECT OF TERMINATION

                  Both parties  shall  remain  liable to the other party for any
                  outstanding  and matured rights and obligations at the time of
                  termination,  including all outstanding payments of the Option
                  Fee and for the  wafers  already  ordered  and/or  shipped  to
                  Customer.

                  In addition,  if this  Agreement is terminated by Customer due
                  to a breach by TSMC,  then TSMC shall  refund to Customer  any
                  portion of the Option Fee already paid by Customer to TSMC but
                  not  yet  credited  to  the  purchase   prices  of  wafers  in
                  accordance with Section 5 above.

8.       BOARD APPROVAL


         Customer  shall  obtain the  approval by its Board of Directors of this
         Agreement, and submit to TSMC, at the time of executing this Agreement,
         an   authentic   copy  of  it's  board   resolution   authorizing   the
         representative designated below to execute this Agreement.


                                       8

                        CONFIDENTIAL TREATMENT REQUESTED
                        --------------------------------
<PAGE>

9.       LIMITATION OF LIABILITY

         In no event shall  either  party be liable for any  indirect,  special,
         incidental or consequential damages (including loss of profits and loss
         of use)  resulting  from,  arising out of or in connection  with either
         party's  performance  or failure to perform  under this  Agreement,  or
         resulting  from,  arising out of or in connection  with either  party's
         producing,  supplying,  and/or  sale of the  wafers,  whether  due to a
         breach of contract, breach of warranty, tort, negligence, or otherwise.

10.      NOTICE

         All notices  required or  permitted  to be sent by either  party to the
         other  party  under this  Agreement  shall be sent by  registered  mail
         postage prepaid,  or by personal delivery,  or by fax. Any notice given
         by fax shall be followed by a  confirmation  copy within ten (10) days.
         Unless  changed by written  notice  given by either party to the other,
         the  addresses  and fax numbers of the  respective  parties shall be as
         follows:

To TSMC:

TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY, LTD.
No. 121, Park Avenue 3
Science-Based Industrial Park
Hsinchu, Taiwan
Republic of China                      FAX: 886-35-781545

To Customer:
PMC-SIERRA CORPORATION
8501 Commerce Court
Burnaby, B.C. Canada V5A4N3            FAX: 604-668-7301


                                       9

                        CONFIDENTIAL TREATMENT REQUESTED
                        --------------------------------
<PAGE>

11.      ENTIRE AGREEMENT

         This  Agreement,   including  Exhibits  A-E,   constitutes  the  entire
         agreement  between  the  parties  with  respect to the  subject  matter
         hereof,  and  supersedes  and  replaces  all  prior or  contemporaneous
         understandings, agreements, dealings and negotiations, oral or written,
         regarding the subject matter  hereof.  No  modification,  alteration or
         amendment of this  Agreement  shall be effective  unless in writing and
         signed by both  parties.  No waiver of any  breach or failure by either
         party to enforce  any  provision  of this  Agreement  shall be deemed a
         waiver  of any  other  or  subsequent  breach,  or a waiver  of  future
         enforcement of that or any other provision.

12.      GOVERNING LAW

         This Agreement will be governed by and  interpreted in accordance  with
         the laws of the Republic of China.

13.      ARBITRATION

         Each party will make best  efforts to resolve  amicably any disputes or
         claims  under this  Agreement  among the  parties.  In the event that a
         resolution  is not reached  among the parties  within  thirty (30) days
         after written notice by any party of the dispute or claim,  the dispute
         or claim  shall be finally  settled by  binding  arbitration  in Taipei
         under The Rules of Arbitration of the International Chamber of Commerce
         by three (3) arbitrators  appointed in accordance with such rules.  The
         arbitration  proceeding shall be conducted in English.  Judgment on the
         award  rendered by the  arbitrator  may be entered in any court  having
         jurisdiction thereof.


                                       10

                        CONFIDENTIAL TREATMENT REQUESTED
                        --------------------------------
<PAGE>

14.      ASSIGNMENT

         This  Agreement  shall be binding  on and inure to the  benefit of each
         party and  its  successors,  and  except that  Customer may assign this
         Agreement under Section 6 above,  neither party shall assign any of its
         rights hereunder,  nor delegate its obligations hereunder, to any third
         party, without the prior written consent of the other.

15.      CONFIDENTIALITY

         Neither  party  shall  disclose  the  existence  or  contents  of  this
         Agreement except as required by Customer's assignment of this Agreement
         to any third parties  pursuant to Section 6 above, in confidence to its
         advisers, as required by applicable law, or otherwise without the prior
         written consent of the other party.

16.      FORCE MAJEURE

         Neither party shall be responsible for delays or failure in performance
         resulting from acts beyond the reasonable  control of such party.  Such
         acts shall  include but not limited to acts of God,  war,  riot,  labor
         stoppages, governmental actions, fires, floods, and earthquakes.

         IN WITNESS WHEREOF, the parties, have executed this Agreement as of the
         date first stated above.


         TAIWAN SEMICONDUCTOR                   PMC-SIERRA CORPORATION
         MANUFACTURING CO., LTD.

         BY:      ________________________      BY:      _______________________
                  Donald Brooks                          James V. Diller
                  President                              CEO


                                       11

                        CONFIDENTIAL TREATMENT REQUESTED
                        --------------------------------
<PAGE>



                                    EXHIBIT A
                              CAPACITY FACTOR TABLE

                                 [TABLE OMITTED]







                                       12

                        CONFIDENTIAL TREATMENT REQUESTED
                        --------------------------------
<PAGE>


                                    EXHIBIT B
                           PMC-SIERRA CORPORATION/TSMC
                               COMMITTED CAPACITY

                                 [TABLE OMITTED]







                                       13

                        CONFIDENTIAL TREATMENT REQUESTED
                        --------------------------------
<PAGE>


                                    EXHIBIT C
                          TSMC CMOS Technology Roadmap

                                 [TABLE OMITTED]






                                       14

                        CONFIDENTIAL TREATMENT REQUESTED
                        --------------------------------
<PAGE>



                                    EXHIBIT D
                              OPTION FEE (Option I)

         Year              Option Capacity           Option Fee       Due Date
                           (Unit: Wafer              (Unit: US$)
                           Equivalent)

     [ REDACTED ]          [ REDACTED ]              [ REDACTED ]   [ REDACTED ]

     [ REDACTED ]                                    [ REDACTED ]   [ REDACTED ]





                                       15

                        CONFIDENTIAL TREATMENT REQUESTED
                        --------------------------------
<PAGE>


                                    EXHIBIT E
                        STANDARD FORM OF PROMISSORY NOTE

Amount: US $ _______________________         Due Date: ________________________

         The Undersigned,  ____________________  (the "Maker"),  unconditionally
promise to pay to Taiwan Semiconductor  Manufacturing Co., Ltd. or its order the
[ REDACTED ] annum on any unpaid portion of the principal  amount stated herein,
and said payment will be made at _______________ (Place of Payment).

         This Note shall be governed in all respects by the laws of the Republic
of China.

         The Maker of this Note agrees to waive  protests and notice of whatever
kind.

Issue Date:                ________________________

Issue Place:      ________________________


                               Maker's Signature:     ________________________


                               Maker's Address:       ________________________


                                                      ________________________


                                       16


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