QUICKTURN DESIGN SYSTEMS INC
8-K/A, 1999-01-06
INSTRUMENTS FOR MEAS & TESTING OF ELECTRICITY & ELEC SIGNALS
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<PAGE>
 
                     SECURITIES AND EXCHANGE COMMISSION
                           Washington, D.C.  20549

                                 FORM 8-K/A

                               CURRENT REPORT

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


Date of Report (Date of earliest event reported): December 8, 1998
                                                  ------------------------------
 
                       QUICKTURN DESIGN SYSTEMS, INC.
- --------------------------------------------------------------------------------
           (Exact name of registrant as specified in its charter)

   Delaware                        0-22738                      77-0159619
- --------------------------------------------------------------------------------
 (State or other                 (Commission                  (IRS Employer
 jurisdiction of                 File Number)             Identification Number)
  incorporation)
 
                55 W. TRIMBLE ROAD SAN JOSE, CA                   95131
- --------------------------------------------------------------------------------
            (Address of principal executive offices)            (Zip Code)
 
Registrant's telephone number, including area code: (408) 914-6000
                                                    ----------------------
 
                                     N/A
- --------------------------------------------------------------------------------
        (Former name or former address, if changed since last report)
<PAGE>
 
ITEM 5.   OTHER EVENTS..
          ------------- 

     On January 4, 1999, Quickturn Design Systems, Inc. ("Quickturn") and
Cadence Design Systems, Inc. ("Cadence") amended their Agreement and Plan of
Merger (the "Merger Agreement") dated as of December 8, 1998, as amended on
December 16, 1998, to reflect an increase in the value of the shares of common
stock of Cadence to be received in connection with the merger by holders of
common stock of Quickturn to $15.00 per share of Quickturn common stock.


ITEM 7.   FINANCIAL STATEMENTS AND EXHIBITS.
          --------------------------------- 


     (c)  Exhibits
          --------

          2.1  Amendment No. 2 dated as of January 4, 1999 to Agreement and
               Plan of Merger, dated as of December 8, 1998, by and among the
               Registrant, CDSI Acquisition, Inc. and Quickturn Design
               Systems, Inc.

                                      -2-
<PAGE>
 
                                 SIGNATURES


     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 hereunto duly authorized.


Dated:    January 6,1999                QUICKTURN DESIGN SYSTEMS, INC.


                                        /s/ RAYMOND K. OSTBY
                                        ----------------------------------------
                                        Raymond K. Ostby
                                        Vice President, Finance and 
                                         Administration, Chief Financial 
                                         Officer and Secretary

                                      -3-
<PAGE>
 
                               INDEX TO EXHIBITS
                               -----------------


  Exhibit
  Number                        Description of Document
  ------                        -----------------------


   2.1              Amendment No. 2 dated as of January 4, 1999 to Agreement
                    and Plan of Merger, dated as of December 8, 1998, by and
                    among the Registrant, CDSI Acquisition, Inc. and Quickturn
                    Design Systems, Inc.

<PAGE>
 
                                                                   EXHIBIT 2.1
                             STOCK OPTION AREEMENT


  THIS STOCK OPTION AGREEMENT is dated as of December 8, 1998, between
Cadence Design Systems, Inc., a Delaware corporation ("Grantee"), and Quickturn
Design Systems, Inc., a Delaware corporation ("Issuer").

                                    RECITALS

     A.  Grantee, CDSI Acquisition, Inc. ("Acquisition") and Issuer are
simultaneously entering into an Agreement and Plan of Merger (the "Merger
Agreement") which provides, among other things, that, upon the terms and subject
to the conditions thereof, Acquisition will be merged with and into Issuer (the
"Merger").

     B.  As a condition to its willingness to enter into the Merger Agreement,
Grantee has required that Issuer agree, and Issuer has agreed, to enter into
this Stock Option Agreement, which provides, among other things, that Issuer
grant to Grantee an option to purchase shares of Issuer's Common Stock, $.001
par value per share ("Issuer Common Stock"), upon the terms and subject to the
conditions provided for herein.

     NOW, THEREFORE, in consideration of the premises and mutual covenants and
agreements contained in this Stock Option Agreement and the Merger Agreement,
the parties agree as follows:

     1.  GRANT OF OPTION.  Subject to the terms and conditions of this Stock
         ---------------                                                    
Option Agreement, Issuer hereby grants to Grantee an irrevocable option (the
"Option") to purchase 3,619,100 shares of Issuer Common Stock (the "Option
Shares"), in the manner set forth below, at an exercise price of $14.00 per
share of Issuer Common Stock, subject to adjustment as provided below (the
"Option Price").  Capitalized terms used herein but not defined herein shall
have the meanings set forth in the Merger Agreement.

     2.  EXERCISE OF OPTION.
         ------------------ 

          (a) Subject to the satisfaction or waiver of the conditions set forth
     in Section 9 of this Stock Option Agreement, prior to the termination of
     this Stock Option Agreement in accordance with its terms, Grantee may
     exercise the Option, in whole or in part, at any time or from time to time
     on or after the occurrence of a Triggering Event.  The Option shall
     terminate and not be exercisable at any time following the Expiration Date
     (as defined in Section 11).  The term "Triggering Event" shall mean the
     time immediately prior to the occurrence of any of the events (or series of
     events) specified in Section 6.3(a) of the Merger Agreement giving rise to
     the obligation of the Company to pay the fee specified in Section 6.3(a).
     The Option will not be exercisable if Grantee willfully and materially
     breached the Merger Agreement.

                                       1
<PAGE>
 
          (b) In the event Grantee wishes to exercise the Option at such time as
     the Option is exercisable and has not terminated, Grantee shall deliver
     written notice (the "Exercise Notice") to Issuer specifying its intention
     to exercise the Option, the total number of Option Shares it wishes to
     purchase and a date and time for the closing of such purchase (a "Closing")
     not less than one (1) nor more than thirty (30) business days after the
     later of (i) the date such Exercise Notice is given and (ii) the expiration
     or termination of any applicable waiting period under the HSR Act.  If
     prior to the Expiration Date (as defined in Section 11 below) any person or
     Group (other than Grantee and its affiliates) shall have acquired thirty
     percent (30%) or more of the then outstanding shares of Issuer Common Stock
     (a "Share Acquisition"), or Issuer shall have entered into a written
     definitive agreement with any person or group (other than Grantee and its
     affiliates) providing for a Company Acquisition, then Grantee, in lieu of
     exercising the Option, shall have the right at any time thereafter (for so
     long as the Option is exercisable under Section 2(a) hereof) to request in
     writing that Issuer pay, and promptly (but in any event not more than five
     (5) business days) after the giving by Grantee of such request, Issuer
     shall pay to Grantee, in cancellation of the Option, an amount in cash (the
     "Cancellation Amount") equal to (i) the lesser of

               (x)  the excess over the Option Price of the greater of (A) the
                    last sale price of a share of Issuer Common Stock as
                    reported on the Nasdaq National Market System on the last
                    trading day prior to the date of the Exercise Notice, and
                    (B) (1) the highest price per share of Issuer Common Stock
                    offered to be paid or paid by any such person or Group
                    pursuant to or in connection with such Share Acquisition or
                    Company Acquisition or (2) if such Company Acquisition
                    consists of a purchase and sale of assets, the aggregate
                    consideration offered to be paid or paid in any transaction
                    or proposed transaction in connection with a Company
                    Acquisition, divided by the number of shares of Issuer
                    Common Stock then outstanding, and

               (y)  $3.8890884474

     multiplied by (ii) the number of Option Shares then covered by the Option.
     If all or a portion of the price per share of Issuer Common Stock offered,
     paid or payable or the aggregate consideration offered, paid or payable for
     the stock or assets of Issuer, each as contemplated by the preceding
     sentence, consists of noncash consideration, such price or aggregate
     consideration shall be the cash consideration, if any, plus the fair market
     value of the non-cash consideration as determined by the investment bankers
     of Issuer and the investment bankers of Grantee.

          (c) Notwithstanding anything to the contrary contained herein, the
     economic benefit, if any, which Grantee may derive hereunder shall be
     limited as follows:  (1) in no event shall Grantee's Total Payment (as
     defined below) exceed $14,075,000, and Grantee shall pay any excess over
     such amount to Issuer, and (2)  the Option may not be exercised
    

                                       2
<PAGE>
 
     for a number of Option Shares as would, as of the date of exercise, result
     in a Notional Total Payment (as defined below), together with the actual
     Total Payment immediately preceding such exercise, exceeding $14,075,000.
     As used herein, (1) "Total Payment" shall mean the sum (before taxes) of
     the following: (i) any Cancellation Amount received by Grantee pursuant to
     Section 2(b) hereof, (ii)(x) the net cash amounts received by Grantee
     pursuant to the sale of Option Shares (or any other securities into which
     such Option Shares shall be converted or exchanged) pursuant to Section 12
     or otherwise to any unaffiliated party, less (y) the aggregate Option Price
     for such shares, (iii) any amounts received by Grantee upon transfer of the
     Option (or any portion thereof) to any unaffiliated party, and (iv) the
     amount actually received by Grantee pursuant to Section 6.3(a) of the
     Merger Agreement; and (2) "Notional Total Payment" with respect to any
     number of Option Shares as to which Grantee may propose to exercise the
     Option shall be the Total Payment determined as of the date of such
     proposed exercise assuming that the Option were exercised on such date for
     such number of shares and assuming further that such shares, together with
     all other Option Shares held by Grantee as of such date, were sold for cash
     at the closing market price for the Issuer Common Stock as of the close of
     business on the preceding trading day (less customary brokerage
     commissions). For purposes of this Section 2, references to Grantee shall
     be deemed to include references to any affiliate of Grantee.

     3.  PAYMENT OF OPTION PRICE AND DELIVERY OF CERTIFICATE.  Any Closings
         ---------------------------------------------------               
under Section 2 of this Stock Option Agreement shall be held at the principal
executive offices of Issuer, or at such other place as Issuer and Grantee may
agree.  At any Closing hereunder, (a) Grantee or its designee will make payment
to Issuer of the aggregate price for the Option Shares being so purchased by
delivery of a certified check, official bank check or wire transfer of funds
pursuant to Issuer's instructions payable to Issuer in an amount equal to the
product obtained by multiplying the Option Price by the number of Option Shares
to be purchased, and (b) upon receipt of such payment Issuer will deliver to
Grantee or its designee a certificate or certificates representing the number of
validly issued, fully paid and non-assessable Option Shares so purchased, in the
denominations and registered in such names designated to Issuer in writing by
Grantee.

     4.  REGISTRATION AND LISTING OF OPTION SHARES.
         ----------------------------------------- 

          (a) Issuer will, if requested by Grantee at any time or from time to
     time within two (2) years following a Triggering Event (the "Registration
     Period"), in order to permit the sale or other disposition of the Option
     Shares that have been acquired by or are issuable to Grantee upon exercise
     of the Option ("Registrable Securities"), register under the Securities Act
     of 1933, as amended (the "Act"), the offering, sale and delivery, or other
     disposition, of the Registrable Securities.  In connection with any such
     sale or other disposition, Grantee shall use all reasonable efforts to
     prevent any person or group from purchasing through such offering shares of
     Issuer Common Stock representing more than five percent (5%) of the
     outstanding Common Stock of Issuer on a fully diluted basis at the time of
     such request.  Any such Registration Notice must relate to a number of
     Registrable Securities equal to at least twenty percent (20%) of the Option
     Shares, unless

                                       3
<PAGE>
 
     the remaining number of Registrable Securities is less than such amount, in
     which case Grantee shall be entitled to exercise its rights hereunder but
     only for all of the remaining Registrable Securities (a "Permitted
     Offering"). Grantee's rights hereunder shall terminate at such time as
     Grantee shall be entitled to sell all of the remaining Registrable
     Securities pursuant to Rule 144(k) under the Act. Issuer will use all
     reasonable efforts to qualify any Registrable Securities Grantee desires to
     sell or otherwise dispose of under applicable state securities or "blue
     sky" laws; provided, however, that Issuer shall not be required to qualify
     to do business, or consent to general service of process, in any
     jurisdiction by reason of this provision. Without Grantee's prior written
     consent, no other securities may be included in any such registration.
     Issuer will use all reasonable efforts to cause each such registration
     statement to become effective, to obtain all consents or waivers of other
     parties that are required therefor and to keep such registration statement
     effective for a period of ninety (90) days from the day such registration
     statement first becomes effective. The obligations of Issuer hereunder to
     file a registration statement and to maintain its effectiveness may be
     suspended for one or more periods not exceeding ninety (90) days in the
     aggregate if the Board of Directors of Issuer shall have determined in good
     faith that the filing of such registration statement or the maintenance of
     its effectiveness would require disclosure of nonpublic information that
     would materially and adversely affect Issuer, or Issuer is required under
     the Act to include audited financial statements for any period in such
     registration statement and such financial statements are not yet available
     for inclusion in such registration statement. Grantee shall be entitled to
     make up to two (2) requests under this Section 4(a). For purposes of
     determining whether the two (2) requests have been made under this Section
     4(a), only requests relating to a registration statement that has become
     effective under the Act will be counted.

          (b) If, during the Registration Period, Issuer shall propose to
     register under the Act the offering, sale and delivery of Issuer's Common
     Stock for cash for its own account or for any other stockholder of Issuer
     pursuant to a firm underwriting, it will, in addition to Issuer's other
     obligations under this Section 4, allow Grantee the right to participate in
     such registration provided that Grantee participates in such underwriting;
     provided, however, that, if the managing underwriter of such offering
     advises Issuer in writing that in its opinion the number of shares of
     Issuer's Common Stock requested to be included in such registration exceeds
     the number that it would be in the best interests of Issuer to sell in such
     offering, Issuer will, after fully including therein all shares of Issuer
     Common Stock to be sold by Issuer, include the shares of Issuer Common
     Stock requested to be included therein by Grantee pro rata (based on the
     number of shares of Issuer Common Stock requested to be included therein)
     with the shares of Issuer Common Stock requested to be included therein by
     persons other than Issuer and persons to whom Issuer owes a contractual
     obligation (other than any director, officer or employee of Issuer to the
     extent any such person is not currently owed such contractual obligation).

          (c) The expenses associated with the preparation and filing of any
     registration statement pursuant to this Section 4 and any sale covered
     thereby (including any fees related to blue sky qualifications and filing
     fees in respect of SEC or the National Association of Securities Dealers,
     Inc.) ("Registration Expenses") will be paid by Issuer,

                                       4
<PAGE>
 
     except for underwriting discounts or commissions or brokers' fees in
     respect of shares of Issuer's Common Stock to be sold by Grantee and the
     fees and disbursements of Grantee's counsel; provided, however, that Issuer
     will not be required to pay for any Registration Expenses with respect to
     such registration if the registration request is subsequently withdrawn at
     the request of Grantee unless Grantee agrees to forfeit its right to
     request one registration; provided further, however, that, if at the time
     of such withdrawal Grantee has learned of a material adverse change in the
     results of operations, condition, business or prospects of Issuer not known
     to Grantee at the time of the request and has withdrawn the request within
     a reasonable period of time following disclosure by Issuer to Grantee of
     such material adverse change, then Grantee shall not be required to pay any
     of such expenses and will retain all remaining rights to request
     registration. Grantee will provide all information reasonably requested by
     Issuer for inclusion in any registration statement to filed hereunder.

          (d) The registration rights granted under this Section 4 are subject
     to and are limited by any registration rights previously granted by Issuer,
     and Grantee acknowledges that the registration rights granted under this
     Section 4 shall be subject to any such limitations.

          (e) In connection with each registration under this Section 4, Issuer
     shall indemnify and hold each holder of Option or Option Shares
     participating in such offering (a "Holder"), its underwriters and each of
     their respective affiliates harmless against any and all losses, claims,
     damage, liabilities and expenses (including, without limitation,
     investigation expenses and fees and disbursements of counsel and
     accountants), joint or several, to which such Holder, its underwriters and
     each of their respective affiliates may become subject, under the Act or
     otherwise, insofar as such losses, claims, damages, liabilities or expenses
     (or actions in respect thereof) arise out of or are based upon an untrue
     statement or alleged untrue statement of a material fact contained in any
     registration statement (including any prospectus therein), or any amendment
     or supplement thereto, or arise out of or are based upon the omission or
     alleged omission to state therein a material fact required to be stated
     therein or necessary to make the statements therein not misleading, other
     than such losses, claims, damages, liabilities or expenses (or actions in
     respect thereof) which arise out of or are based upon an untrue statement
     or alleged untrue statement of a material fact contained in written
     information furnished by a Holder to Issuer expressly for use in such
     registration statement.

          (f) In connection with any registration statement pursuant to this
     Section 4, each Holder agrees to furnish Issuer with such information
     concerning itself and the proposed sale or distribution as shall reasonably
     be required in order to ensure compliance with the requirements of the Act
     and shall provide representations and warranties customary for selling
     shareholders who are unaffiliated with the issuer.  In addition, Grantee
     and each Holder shall indemnify and hold Issuer, its underwriters and each
     of their respective affiliates harmless against any and all losses, claims,
     damages, liabilities and expenses (including, without limitation,
     investigation expenses and fees and disbursement of counsel and
     accountants), joint or several, to which Issuer, its

                                       5
<PAGE>
 
     underwriters and each of their respective affiliates may become subject
     under the Act or otherwise, insofar as such losses, claims, damages,
     liabilities or expenses (or actions in respect thereof) arise out of or are
     based upon an untrue statement or alleged untrue statement of a material
     fact contained in written information furnished by any Holder to Issuer
     expressly for use in such registration statement; provided, however, that
     in no event shall any indemnification amount contributed by a Holder
     hereunder exceed the proceeds of the offering received by such Holder.

          (g) Upon the issuance of Option Shares hereunder, Issuer will promptly
     list such Option Shares with the Nasdaq National Market System or on such
     national or other exchange on which the shares of Issuer Common Stock are
     at the time listed.

     5.  REPRESENTATIONS AND WARRANTIES OF ISSUER.  Issuer hereby represents and
         ----------------------------------------                               
warrants to Grantee as follows:

          (a) Issuer is a corporation duly organized, validly existing and in
     good standing under the laws of the State of Delaware and has requisite
     power and authority to enter into and perform its obligations under this
     Stock Option Agreement.

          (b) The execution and delivery of this Stock Option Agreement and the
     consummation of the transactions contemplated hereby have been duly and
     validly authorized by the Board of Directors of Issuer and no other
     corporate proceedings on the part of Issuer are necessary to authorized
     this Stock Option Agreement or to consummate the transactions contemplated
     hereby.  The Board of Directors of Issuer has duly approved the issuance
     and sale of the Option Shares, upon the terms and subject to the conditions
     contained in this Stock Option Agreement, and the consummation of the
     transactions contemplated hereby.  This Stock Option Agreement has been
     duly and validly executed and delivered by Issuer and, assuming this Stock
     Option Agreement has been duly and validly authorized, executed and
     delivered by Grantee, constitutes a valid and binding obligation of Issuer
     enforceable against Issuer in accordance with its terms, subject to
     bankruptcy, insolvency, reorganization, moratorium or other similar laws
     affecting or relating to creditors' rights generally; the availability of
     injunctive relief and other equitable remedies; and limitations imposed by
     law on indemnification for liability under federal securities laws.

          (c) Issuer has taken all necessary action to authorize and reserve for
     issuance and to permit it to issue, and at all times from the date of this
     Stock Option Agreement through the date of expiration of the Option will
     have reserved for issuance upon exercise of the Option, a sufficient number
     of authorized shares of Issuer Common Stock for issuance upon exercise of
     the Option, each of which, upon issuance pursuant to this Stock Option
     Agreement and when paid for as provided herein, will be validly issued,
     fully paid and nonassessable, and shall be delivered free and clear of all
     claims, liens, charges, encumbrances and security interests (other than
     those imposed by Grantee, its affiliate or by applicable law).

                                       6
<PAGE>
 
          (d) The execution, delivery and performance of this Stock Option
     Agreement by Issuer and the consummation by it of the transactions
     contemplated hereby except as required by the HSR Act and any material
     foreign competition authorities (if applicable), and, with respect to
     Section 4 hereof, compliance with the provisions of the Act and any
     applicable state securities laws, do not require the consent, waiver,
     approval, license or authorization of or result in the acceleration of any
     obligation under, or constitute a default under, any term, condition or
     provision of any charter or bylaw, or any indenture, mortgage, lien, lease,
     agreement, contract, instrument, order, judgment, ordinance, regulation or
     decree or any restriction to which Issuer or any property of Issuer or its
     subsidiaries is bound, except where failure to obtain such consents,
     waivers, approvals, licenses or authorizations or where such acceleration
     or defaults could not, individually or in the aggregate, reasonably be
     expected to have a Material Adverse Effect on Issuer.

     6.  REPRESENTATIONS AND WARRANTIES OF GRANTEE.  Grantee hereby represents
         -----------------------------------------                            
and warrants to Issuer that:

          (a) Grantee is a corporation duly organized, validly existing and in
     good standing under the laws of the State of Delaware, and has requisite
     power and authority to enter into and perform its obligations under this
     Stock Option Agreement.

          (b) The execution and delivery of this Stock Option Agreement and the
     consummation of the transactions contemplated hereby have been duly and
     validly authorized by the Board of Directors of Grantee and no other
     corporate proceedings on the part of Grantee are necessary to authorize
     this Stock Option Agreement or to consummate the transactions contemplated
     hereby.  This Stock Option Agreement has been duly and validly executed and
     delivered by Grantee and, assuming this Stock Option Agreement has been
     duly executed and delivered by Issuer, constitutes a valid and binding
     obligation of Grantee enforceable against Grantee in accordance with its
     terms, subject to bankruptcy, insolvency, reorganization, moratorium or
     other similar laws affecting or relating to creditors' rights generally;
     the availability of injunctive relief and other equitable remedies; and
     limitations imposed by law on indemnification for liability under federal
     securities laws.

          (c) Grantee is acquiring the Option and it will acquire the Option
     Shares issuable upon the exercise thereof for its own account and not with
     a view to the distribution or resale thereof in any manner not in
     accordance with applicable law.

     7.  COVENANTS OF GRANTEE.  Grantee agrees not to transfer or otherwise
         --------------------                                              
dispose of the Option or the Option Shares, or any interest therein, except that
Grantee may transfer or dispose of the Option Shares so long as such transaction
is in compliance with the Act and any applicable state securities law.  Grantee
further agrees to the placement of the following legend on the certificates)
representing the Option Shares (in addition to any legend required under
applicable state securities laws) and any legend referring to the provisions of
Section 12 hereof:

     "THE SHARES REPRESENTED BY THIS CERTIFICATE HAVE NOT BEEN REGISTERED UNDER
     EITHER THE SECURITIES ACT OF 1933, AS

                                       7
<PAGE>
 
     AMENDED (THE "ACT"), OR ANY APPLICABLE STATE LAW GOVERNING THE OFFER AND
     SALE OF SECURITIES. NO TRANSFER OR OTHER DISPOSITION OF THESE SHARES, OR OF
     ANY INTEREST THEREIN, MAY BE MADE EXCEPT PURSUANT TO AN EFFECTIVE
     REGISTRATION STATEMENT UNDER THE ACT AND SUCH OTHER STATE LAWS OR PURSUANT
     TO EXEMPTIONS FROM REGISTRATION UNDER THE ACT, SUCH OTHER STATE LAWS, AND
     THE RULES AND REGULATIONS PROMULGATED THEREUNDER."

     8.  HSR COMPLIANCE EFFORTS.  Grantee and Issuer shall take, or cause to be
         ----------------------                                                
taken, all reasonable action to consummate and make effective the transactions
contemplated by this Stock Option Agreement, including, without limitation,
reasonable efforts to obtain any necessary consents of third parties and
governmental agencies and the filing by Grantee and Issuer promptly after the
date hereof of any required HSR Act notification forms and the documents
required to comply with the HSR Act.

     9.  CERTAIN CONDITIONS.  The obligation of Issuer to issue Option Shares
         ------------------                                                  
under this Stock Option Agreement upon exercise of the Option shall be subject
to the satisfaction or waiver of the following conditions:

          (a) any waiting periods applicable to the acquisition of the Option
     Shares by Grantee pursuant to this Stock Option Agreement under the HSR Act
     and any material foreign competition laws shall have expired or been
     terminated;

          (b) the representations and warranties of Grantee made in Section 6 of
     this Stock Option Agreement shall be true and correct in all material
     respects as of the date of the Closing for the issuance of such Option
     Shares; and

          (c) no statute, rule or regulation shall be in effect, and no order,
     decree or injunction entered by any court of competent jurisdiction or
     governmental, regulatory or administrative agency or commission in the
     United States shall be in effect which prohibits the exercise of the Option
     or acquisition or issuance of Option Shares pursuant to this Stock Option
     Agreement.

     10.  ADJUSTMENTS UPON CHANGES IN CAPITALIZATION.  In the event of any
          ------------------------------------------                      
change in the number of issued and outstanding shares of Issuer Common Stock by
reason of any stock dividend, stock split, recapitalization, merger, rights
offering, share exchange or other change in the corporate or capital structure
of Issuer, Grantee shall receive, upon exercise of the Option, the stock or
other securities, cash or property to which Grantee would have been entitled if
Grantee had exercised the Option and had been a holder of record of shares of
Issuer Common Stock on the record date fixed for determination of holders of
shares of Issuer Common Stock entitled to receive such stock or other
securities, cash or property at the same aggregate price as the aggregate Option
Price of the Option Shares.

     11.   EXPIRATION. The Option shall expire at the earlier of (y) the
           ----------
           Effective Time (as defined in the Merger Agreement) and (z)
           5:00 p.m., California time, on the day that is the 

                                       8
<PAGE>
 
           twelve (12) month anniversary of the date on which the Merger
           Agreement has been terminated in accordance with the terms thereof
           (such expiration date is referred to as the "Expiration Date").
           
     12.   ISSUER CALL. If Grantee has acquired Option Shares pursuant to
           -----------       
           exercise of the Option (the date of any closing relating to any such
           exercise herein referred to as an "Exercise Date"), then, at any time
           after the date thirteen (13) months following such Exercise Date and
           prior to the date twenty-five (25) months following such Exercise
           Date (the "Purchase Period"), Issuer may require Grantee, upon
           delivery to Grantee of written notice, to sell to Issuer any Option
           Shares held by Grantee as of the date that is ten (10) business days
           after the date of such notice, up to a number of shares equal to the
           number of Option Shares acquired by Grantee pursuant to exercise of
           the Option in connection with such Exercise Date. The per share
           purchase price for such sale (the "Issuer Call Price") shall be equal
           to the higher of (i) the Option Price, less any dividends paid on the
           Option Shares to be purchased by the Issuer pursuant to this Section
           12, plus an amount equal to a return at the rate of fifteen percent
           (15%) of the Option Price per year from the Exercise Date and (b) an
           amount equal to the average of the high and low trading prices per
           share of Issuer Common Stock for the thirty (30) trading day period
           ending one day prior to the delivery of Issuer's notice exercising
           its call rights pursuant to this Section 12. The closing of any sale
           of Option Shares pursuant to this Section 12 shall take place at the
           principal offices of Issuer at a time and on a date designated by
           Issuer in the aforementioned notice to Grantee, which date shall be
           no more than thirty (30) and no less than twelve (12) business days
           from the date of such notice. The Issuer Call Price shall be paid in
           immediately available funds.

     13.   GENERAL PROVISIONS.
           ------------------

          (a) Survival.  All of the representations, warranties and covenants
              --------                                                       
     contained herein shall survive a Closing and shall be deemed to have been
     made as of the date hereof and as of the date of each Closing, except for
     the representations and warranties in Section 5(d) hereof which shall be
     deemed to have been made only as of the date hereof.

          (b) Further Assurances.  If Grantee exercises the Option, or any
              ------------------                                          
     portion thereof, in accordance with the terms of this Stock Option
     Agreement, Issuer and Grantee will execute and deliver all such further
     documents and instruments and use all reasonable efforts to take all such
     further action as may be necessary in order to consummate the transactions
     contemplated thereby.

          (c) Severability.  It is the desire and intent of the parties that the
              ------------                                                      
     provisions of this Stock Option Agreement be enforced to the fullest extent
     permissible under the law and public policies applied in each jurisdiction
     in which enforcement is sought.  Accordingly, in the event that any
     provision of this Stock Option Agreement would be held in any jurisdiction
     to be invalid, prohibited or unenforceable for any reason, such provision,
     as to such jurisdiction, shall be ineffective, without invalidating the
     remaining provisions of this Stock Option Agreement or affecting the
     validity or enforceability of such provision in any other jurisdiction.
     Notwithstanding the foregoing, if such provision
   

                                       9
<PAGE>
 
     could be more narrowly drawn so as not be invalid, prohibited or
     unenforceable in such jurisdiction, it shall, as to such
     jurisdiction, be so narrowly drawn, without invalidating the remaining
     provisions of this Stock Option Agreement or affecting the
     validity or enforceability of such provision in any other jurisdiction.

          (d) Assignment; Transfer of Stock Option.  This Stock Option Agreement
              ------------------------------------                              
     shall be binding on and inure to the benefit of the parties hereto and
     their respective successors and permitted assigns; provided, however, that
     Issuer and Grantee, without the prior written consent of the other party,
     shall not be entitled to assign or otherwise transfer any of its rights or
     obligations hereunder and any such attempted assignment or transfer shall
     be void; provided, further, that Grantee shall be entitled to assign or
     transfer this Stock Option Agreement or any rights hereunder to any wholly-
     owned subsidiary of Grantee so long as such wholly-owned subsidiary agrees
     in writing to be bound by the terms and provisions hereof.

          (e) Specific Performance.  The parties agree and acknowledge that in
              --------------------                                            
     the event of a breach of any provision of this Stock Option Agreement, the
     aggrieved party would be without an adequate remedy at law.  The parties
     therefore agree that in the event of a breach of any provision of this
     Stock Option Agreement, the aggrieved party may elect to institute and
     prosecute proceedings in any court of competent jurisdiction to enforce
     specific performance or to enjoin the continuing breach of such provisions,
     as well as to obtain damages for breach of this Stock Option Agreement.  By
     seeking or obtaining any such relief, the aggrieved party will not be
     precluded from seeking or obtaining any other relief to which it may be
     entitled.

          (f) Amendments.  This Stock Option Agreement may not be modified,
              ----------                                                   
     amended, altered or supplemented except upon the execution and delivery of
     a written agreement executed by Grantee and Issuer.

          (g) Notices.  All notices, requests, claims, demands and other
              -------                                                   
     communications hereunder shall be in writing and shall be deemed to be
     sufficient if contained in a written instrument and shall be deemed given
     if delivered personally, telecopied, sent by nationally-recognized,
     overnight courier or mailed by registered or certified mail (return receipt
     requested), postage prepaid, to the other party at the following addresses
     (or such other address for a party as shall be specified by like notice):

If to Grantee:

     Cadence Design Systems, Inc.
     2655 Seely Road
     San Jose, California  95134
     Telecopier:  (408) 944-6855
     Attention:  General Counsel

                                       10
<PAGE>
 
          with a copy to:
 
          Gibson, Dunn & Crutcher LLP
          One Montgomery Street
          Telesis Tower
          San Francisco, California
          94104
          Telecopier: (415) 986-5309
          Attention:  Kenneth R. Lamb

If to Issuer:
 
          Quickturn Design Systems, Inc.
          55 West Trimble Road
          San Jose, California  95131
          Telecopier:  (408) 914-6001
          Attention:  President

          with a copy to:

          Wilson, Sonsini, Rosati & Goodrich LLP
          650 Page Mill Road
          Palo Alto, CA  94304
          Telecopier:  (650) 493-6811
          Attention:  Larry Sonsini

          (h) Headings. The headings contained in this Stock Option Agreement
              --------                                              
     are for reference purposes only and shall not affect in any way the meaning
     or interpretation of this Stock Option Agreement.

          (i) Counterparts.  This Stock Option Agreement may be executed in one
              ------------                                                     
     or more counterparts, each of which shall be an original, but all of which
     together shall constitute one and the same agreement.

          (j) Governing Law.  This Stock Option Agreement shall be governed by
              -------------                                                   
     and construed in accordance with the laws of the State of Delaware without
     regard to the principles of conflicts of law thereof.

          (k) Jurisdiction and Venue.  Each of Issuer and Grantee hereby agrees
              ----------------------                                           
     that any proceeding relating to this Stock Option Agreement shall be
     brought solely in a court in the State of Delaware.  Each of Issuer and
     Grantee hereby consents to personal jurisdiction in any such action brought
     in any such Delaware court, consents to service of

                                       11
<PAGE>
 
     process by registered mail made upon such party and such party's agent and
     waives any objection to venue in any such Delaware court or to any claim
     that any such Delaware court is an inconvenient forum .

          (l) Entire Agreement.  This Stock Option Agreement and the Merger
              ----------------                                             
     Agreement, and any documents and instruments referred to herein and
     therein, constitute the entire agreement between the parties hereto and
     thereto with respect to the subject matter hereof and thereof and supersede
     all other prior agreements and understandings, both written and oral,
     between the parties with respect to the subject matter hereof and thereof.
     Nothing in this Stock Option Agreement shall be construed to give any
     person other than the parties to this Stock Option Agreement or their
     respective successors or permitted assigns any legal or equitable right,
     remedy or claim under or in respect of this Stock Option Agreement or any
     provision contained herein.

          (m) Expenses.  Except as otherwise provided in this Stock Option
              --------                                                    
     Agreement, each party shall pay its own expenses incurred in connection
     with this Stock Option Agreement and the transactions contemplated hereby.

                                       12
<PAGE>
 
     IN WITNESS WHEREOF, the parties have caused this Stock Option Agreement to
be signed by their respective officers thereunto duly authorized as of the date
first written above.

                              CADENCE DESIGN SYSTEMS, INC.

                              By: /s/ H. Raymond Bingham
                                 -------------------------------------
                                  Name:  H. Raymond Bingham
                                  Title: Executive Vice President and
                                         Chief Financial Officer

                              QUICKTURN DESIGN SYSTEMS, INC.

                              By: /s/ Keith R. Lobo
                                 ----------------------------------------------
                                  Name:  Keith R. Lobo
                                  Title: President and Chief Executive Officer

                                       13


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