QUICKTURN DESIGN SYSTEMS INC
S-8, 1996-12-20
INSTRUMENTS FOR MEAS & TESTING OF ELECTRICITY & ELEC SIGNALS
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<PAGE>

   AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON DECEMBER 20, 1996
                                                 REGISTRATION NO. 333-
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------


                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                    FORM S-8
                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933

                         QUICKTURN DESIGN SYSTEMS, INC.
               (Exact name of issuer as specified in its charter)

           DELAWARE                                     77-0159619
   (State of incorporation)                (I.R.S. Employer Identification No.)

                                440 CLYDE AVENUE
                         MOUNTAIN VIEW, CALIFORNIA 94043
                    (Address of principal executive offices)


                          1996 SUPPLEMENTAL STOCK PLAN
                            (Full title of the plan)

                                  KEITH R. LOBO
                               PRESIDENT AND CHIEF
                                EXECUTIVE OFFICER
                          QUICKTURN DESIGN SYSTEMS, INC.
                                440 CLYDE AVENUE
                         MOUNTAIN VIEW, CALIFORNIA 94043
                                 (415) 967-3300
         (Name, address, and telephone number, including area code, 
                            of agent for service)

                                                
                                    COPY TO:
                            HERBERT P. FOCKLER, ESQ.
                        WILSON, SONSINI, GOODRICH & ROSATI
                            PROFESSIONAL CORPORATION
                               650 PAGE MILL ROAD
                            PALO ALTO, CA 94304-1050
                                 (415) 493-9300

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

<PAGE>

- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
                        CALCULATION OF REGISTRATION FEE
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------

                                        Proposed     Proposed
      Title of            Maximum        Maximum      Maximum    
     Securities           Amount         Offering    Aggregate     Amount of
        to be              to be        Price Per     Offering    Registration
     Registered          Registered       Share        Price         Fee
- -------------------------------------------------------------------------------
Common Stock,                           
  no par value ...... 1,000,000 shares  $19.125 (1)  $19,125,000  $5,795.45
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
(1)       Estimated in accordance with Rule 457(h) under the Securities Act of
          1933 solely for the purpose of calculating the total registration fee.
          Computation based upon $19.125, the average of the high and low prices
          of the Common Stock as reported in the NASDAQ National Market System
          on December 16, 1996.



                                       -ii-

<PAGE>

                         QUICKTURN DESIGN SYSTEMS, INC.

                       REGISTRATION STATEMENT ON FORM S-8

                                     PART II

                 INFORMATION REQUIRED IN REGISTRATION STATEMENT

Item 3.  INCORPORATION OF DOCUMENTS BY REFERENCES

     There are hereby incorporated by reference in this Registration Statement
the following documents and information heretofore filed by Quickturn Design
Systems, Inc. (the "Company") with the Securities and Exchange Commission:

     (1)  The Company's Annual Report on Form 10-K under the Securities Exchange
Act of 1934 (the "Exchange Act") for the fiscal year ended December 31, 1995.

     (2)  The Company's Quarterly Reports on Form 10-Q under the Exchange Act
for the fiscal quarters ended March 31, 1996, June 30, 1996 and September 30,
1996.

     (3)  The description of the Company's Common Stock contained in the
Company's Registration Statement on Form 8-A dated October 29, 1993 (File No. 0-
22738) filed pursuant to Section 12(g) of the Exchange Act and declared
effective in December 1993, including any amendment or report filed for the
purpose of updating such description.

     In addition, all documents filed by the Company pursuant to Sections 13(a),
13(c), 14 and 15(d) of the Securities Exchange Act of 1934 (the "Exchange Act")
on or after the date of this Registration Statement and prior to the filing of a
post-effective amendment which indicates that all securities offered have been
sold or which deregisters all securities then remaining unsold shall be deemed
to be incorporated by reference in this Registration Statement and to be part
hereof from the date of filing of such documents.

Item 4.  DESCRIPTION OF SECURITIES.

     Not applicable.

Item 5.  INTERESTS OF NAMED EXPERTS AND COUNSEL.

     Not applicable.



                                     II-1
<PAGE>

Item 6.  INDEMNIFICATION OF DIRECTORS AND OFFICERS.

     The Company's Certificate of Incorporation limits the liability of
directors for monetary damages to the maximum extent permitted by Delaware law. 
Delaware law provides that directors of a corporation will not be personally
liable for monetary damages for breach of their fiduciary duties as directors,
except for liability (i) for any breach of their duty of loyalty to the
corporation or its stockholders; (ii) for acts or omissions not in good faith or
that involve intentional misconduct or a knowing violation of law; (iii) for
unlawful payments of dividends or unlawful stock repurchases or redemptions as
provided in Section 174 of the Delaware General Corporation Law; or (iv) for any
transaction from which the director derived an improper personal benefit.

     The Company's Bylaws provide that the Company shall indemnify its directors
and executive officers and may indemnify its other officers, employees, agents
and other agents to the fullest extent permitted by law.  The Company believes
that indemnification under its Bylaws covers at least negligence and gross
negligence on the part of indemnified parties.  The Company's Bylaws also permit
the Company to secure insurance on behalf of any officer, director, employee or
other agent for any liability arising out of his or her actions in such
capacity, regardless of whether the Bylaws would permit indemnification.

     The Company has entered into agreements to indemnify its directors and
officers, in addition to indemnification provided for in the Company's Bylaws. 
These agreements, among other things, indemnify the Company's directors and
officers for certain expenses (including attorneys' fees), judgments, fines and
settlement amounts incurred by any such person in any action or proceeding,
including any action by or in the right of the Company, arising out of such
person's services as a director or officer of the Company, any subsidiary of the
Company or any other company or enterprise to which the person provides services
at the request of the Company.

     The Company also maintains an insurance policy insuring its directors and
officers against liability for certain acts and omissions while acting in their
official capacities.

Item 7.  EXEMPTION FROM REGISTRATION CLAIMED.

     Not applicable.

Item 8.  EXHIBITS.

          Exhibit
           Number               Description                
          -------   ----------------------------------------
          4.1       1996 Supplemental Stock Plan and form of Stock Option
                    Agreement.
          5.1       Opinion of counsel as to legality of securities being
                    registered.
          23.1      Consent of counsel (contained in Exhibit 5.1)
          23.2      Consent of Independent Auditors
          24.1      Powers of Attorney (see page II-5)


                                     II-2
<PAGE>

Item 9.  UNDERTAKINGS.

   A.     The Company hereby undertakes:

          (1)  To file, during any period in which offers or sales are being
made, a post-effective amendment to this registration statement to include any
material information with respect to the plan of distribution not previously
disclosed in the registration statement or any material change to such
information in the registration statement.

          (2)  That, for the purpose of determining any liability under the
Securities Act, each such post-effective amendment shall be deemed to be a new
registration statement relating to the securities offered therein, and the
offering of such securities at that time shall be deemed to be the initial bona
fide offering thereof.

          (3)  To remove from registration by means of a post-effective
amendment any of the securities being registered which remain unsold at the
termination of the offering.

     B.   The Company hereby undertakes that, for purposes of determining any
liability under the Securities Act, each filing of the Company's annual report
pursuant to Section 13(a) or Section 15(d) of the Exchange Act that is
incorporated by reference in the registration statement shall be deemed to be a
new registration statement relating to the securities offered therein, and the
offering of such securities at that time shall be deemed to be the initial bona
fide offering thereof.

     C.   Insofar as indemnification for liabilities arising under the
Securities Act may be permitted to directors, officers and controlling persons
of the Company pursuant to law, the Company's Articles of Incorporation, the
Company's Bylaws or the Company's indemnification agreements, the Company has
been informed that in the opinion of the Securities and Exchange Commission such
indemnification is against public policy as expressed in the Securities Act and
is therefore unenforceable.  In the event that a claim for indemnification
against such liabilities (other than the payment by the Company of expenses
incurred or paid by a director, officer or controlling person of the Company in
a successful defense of any action, suit or proceeding) is asserted by such
director, officer or controlling person in connection with the securities being
registered hereunder, the Company will, unless in the opinion of its counsel the
matter has already been settled by controlling precedent, submit to a court of
appropriate jurisdiction the question of whether such indemnification by it is
against public policy as expressed in the Securities Act and will be governed by
the final adjudication of such issue.


                                     II-3
<PAGE>


                                   SIGNATURES


     Pursuant to the requirements of the Securities Act of 1933, the Registrant
certifies that it has reasonable grounds to believe that it meets all of the
requirements for filing on Form S-8 and has duly caused this registration
statement to be signed on its behalf by the undersigned, thereunto duly
authorized, in the City of Mountain View, State of California, on this 20th day
of December, 1996.

                                   QUICKTURN DESIGN SYSTEMS, INC.


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



                                     II-4
<PAGE>


                                POWER OF ATTORNEY

     KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature
appears below constitutes and appoints Keith R. Lobo and Raymond K. Ostby
jointly and severally, as his attorneys-in-fact, each with the power of
substitution, for him in any and all capacities to sign any amendments to this
Registration Statement on Form S-8, and to file the same, with exhibits thereto
and other documents in connection therewith, with the Securities and Exchange
Commission, hereby ratifying and confirming all that each of said attorney-in-
fact, or his substitute or substitutes, may do or cause to be done by virtue
hereof.

     Pursuant to the requirements of the Securities Act of 1933, this
registration statement has been signed below by the following persons in the
capacities and on the dates indicated.

<TABLE>
<CAPTION>
       Signature                     Title                               Date
- -------------------------   -------------------------           ----------------------
<S>                         <C>                                 <C>

  /s/ Keith R. Lobo         President, Chief Executive      
- -------------------------   Officer (Principal Executive        December 20, 1996
    Keith R. Lobo           Officer) and Director

/s/ Raymond K. Ostby        Chief Financial Officer         
- -------------------------   (Principal Financial and            December 20, 1996
  Raymond K. Ostby          Accounting Officer) and Secretary

  /s/ Glen M. Antle
- -------------------------   Chairman of the Board of            December 20, 1996
    Glen M. Antle           Directors

/s/ Richard C. Alberding
- -------------------------   Director                            December 20, 1996
Richard C. Alberding

/s/ Michael R. D'Amour
- -------------------------   Director                            December 20, 1996
 Michael R. D'Amour

/s/ Yen-Son (Paul) Huang
- -------------------------   Director                            December 20, 1996
Yen-Son (Paul) Huang

/s/ Frank J. Caulfield
- -------------------------   Director                            December 20, 1996
 Frank J. Caulfield

  /s/ David K. Lam
- -------------------------   Director                            December 20, 1996
    David K. Lam

</TABLE>

                                       II-5

<PAGE>

                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C.  20549

______________________________________________________________________________
                                                   

                                    EXHIBITS

______________________________________________________________________________
                                                   

                       Registration Statement on Form S-8


                         QUICKTURN DESIGN SYSTEMS, INC.

                                December 20, 1996





                                       II-6

<PAGE>


                                INDEX TO EXHIBITS


     Exhibit               
     Number                Description                    
     -------------------------------------------------
      4.1     1996 Supplemental Stock Plan and form of Stock Option
              Agreement.
      5.1     Opinion of counsel as to legality of securities being
              registered.
     23.1     Consent of counsel (contained in Exhibit 5.1)
     23.2     Consent of Independent Auditors
     24.1     Powers of Attorney (see page II-5)



<PAGE>
                                                                 EXHIBIT 4.1


                         QUICKTURN DESIGN SYSTEMS, INC.

                          1996 SUPPLEMENTAL STOCK PLAN


    1.  PURPOSES OF THE PLAN.  The purposes of this Plan are:

        -   to attract and retain the best available personnel for positions of
            substantial responsibility, 

        -   to provide additional incentive to key Employees, Directors and
            Consultants, and 

        -   to promote the success of the Company's business.  

    Options granted under the Plan will be Nonstatutory Stock Options.  

    2.  DEFINITIONS.  As used herein, the following definitions shall apply:

        (a) "ADMINISTRATOR" means the Board or any of its Committees as shall
be administering the Plan, in accordance with Section 4 of the Plan.

        (b) "APPLICABLE LAWS" means the requirements relating to the
administration of stock option plans under U. S. state corporate laws, U.S.
federal and state securities laws, the Code, any stock exchange or quotation
system on which the Common Stock is listed or quoted and the applicable laws of
any foreign country or jurisdiction where Options are granted under the Plan.

        (c) "BOARD" means the Board of Directors of the Company.

        (d) "CODE" means the Internal Revenue Code of 1986, as amended.

        (e) "COMMITTEE"  means a committee of Directors appointed by the Board
in accordance with Section 4 of the Plan.

        (f) "COMMON STOCK" means the Common Stock of the Company.

        (g) "COMPANY" means Quickturn Design Systems, Inc., a Delaware
corporation.

        (h) "CONSULTANT" means any person, including an advisor, engaged by the
Company or a Parent or Subsidiary to render services to such entity.

        (i) "DIRECTOR" means a member of the Board.

        (j) "DISABILITY" means total and permanent disability as defined in
Section 22(e)(3) of the Code.


<PAGE>

        (k) "EMPLOYEE" means any person, including Officers, employed by the
Company or any Parent or Subsidiary of the Company.  A Service Provider shall
not cease to be an Employee in the case of (i) any leave of absence approved by
the Company or (ii) transfers between locations of the Company or between the
Company, its Parent, any Subsidiary, or any successor.  Neither service as a
Director nor payment of a director's fee by the Company shall be sufficient to
constitute "employment" by the Company.

        (l) "EXCHANGE ACT" means the Securities Exchange Act of 1934, as
amended.

        (m) "FAIR MARKET VALUE" means, as of any date, the value of Common
Stock determined as follows:

            (i) If the Common Stock is listed on any established stock exchange
or a national market system, including without limitation the Nasdaq National
Market or The Nasdaq SmallCap Market of The Nasdaq Stock Market, its Fair Market
Value shall be the closing sales price for such stock (or the closing bid, if no
sales were reported) as quoted on such exchange or system for the last market
trading day prior to the time of determination, as reported in THE WALL STREET
JOURNAL or such other source as the Administrator deems reliable;

            (ii)    If the Common Stock is regularly quoted by a recognized
securities dealer but selling prices are not reported, the Fair Market Value of
a Share of Common Stock shall be the mean between the high bid and low asked
prices for the Common Stock on the last market trading day prior to the day of
determination, as reported in THE WALL STREET JOURNAL or such other source as
the Administrator deems reliable;

            (iii)   In the absence of an established market for the Common
Stock, the Fair Market Value shall be determined in good faith by the
Administrator.

        (n) "NONSTATUTORY STOCK OPTION" means an Option not intended to qualify
as an incentive stock option within the meaning of Section 422 of the Code and
the regulations promulgated thereunder.

        (o) "NOTICE OF GRANT" means a written or electronic notice evidencing
certain terms and conditions of an individual Option grant.  The Notice of Grant
is part of the Option Agreement.

        (p) "OFFICER" means a person who is an officer of the Company within
the meaning of Section 16 of the Exchange Act and the rules and regulations
promulgated thereunder.

        (q) "OPTION" means a stock option granted pursuant to the Plan.

        (r) "OPTION AGREEMENT" means an agreement between the Company and an
Optionee evidencing the terms and conditions of an individual Option grant.  The
Option Agreement is subject to the terms and conditions of the Plan.


                                     -2-

<PAGE>

        (s) "OPTION EXCHANGE PROGRAM" means a program whereby outstanding
options are surrendered in exchange for options with a lower exercise price.

        (t) "OPTIONED STOCK" means the Common Stock subject to an Option.

        (u) "OPTIONEE" means the holder of an outstanding Option granted under
the Plan.

        (v) "PARENT" means a "parent corporation," whether now or hereafter
existing, as defined in Section 424(e) of the Code.

        (w) "PLAN" means this 1996 Supplemental Stock Plan.

        (x) "SERVICE PROVIDER" means an Employee, Director or Consultant. 

        (y) "SHARE" means a share of the Common Stock, as adjusted in
accordance with Section 13 of the Plan.

        (z) "SUBSIDIARY" means a "subsidiary corporation", whether now or
hereafter existing, as defined in Section 424(f) of the Code.

    3.  STOCK SUBJECT TO THE PLAN.  Subject to the provisions of Section 13 of
the Plan, the maximum aggregate number of Shares which may be optioned and sold
under the Plan is 1,000,000 Shares.  The Shares may be authorized, but unissued,
or reacquired Common Stock.  

        If an Option expires or becomes unexercisable without having been
exercised in full, or is surrendered pursuant to an Option Exchange Program, the
unpurchased Shares which were subject thereto shall become available for future
grant or sale under the Plan (unless the Plan has terminated).  Shares that have
actually been issued under the Plan shall not be returned to the Plan and shall
not become available for future distribution under the Plan, except that if
unvested Shares are repurchased by the Company at their original purchase price,
such Shares shall become available for future grant under the Plan. 

    4.  ADMINISTRATION OF THE PLAN.

        (a) PROCEDURE.  The Plan shall be administered by (A) the Board or
(B) a Committee, which committee shall be constituted to satisfy Applicable
Laws. 

        (b) RULE 16b-3.  To the extent desirable to qualify transactions
hereunder as exempt under Rule 16b-3, the transactions contemplated hereunder
shall be structured to satisfy the requirements for exemption under Rule 16b-3. 


                                      -3-

<PAGE>

        (c) POWERS OF THE ADMINISTRATOR.  Subject to the provisions of the
Plan, and in the case of a Committee, subject to the specific duties delegated
by the Board to such Committee, the Administrator shall have the authority, in
its discretion:

            (i) to determine the Fair Market Value of the Common Stock, in
accordance with Section 2(m) of the Plan;

            (ii)    to select the Service Providers to whom Options may be
granted hereunder;

            (iii)   to determine whether and to what extent Options are granted
hereunder;

            (iv)    to determine the number of shares of Common Stock to be
covered by each Option granted hereunder;

            (v) to approve forms of agreement for use under the Plan;

            (vi)    to determine the terms and conditions, not inconsistent with
the terms of the Plan, of any award granted hereunder.  Such terms and
conditions include, but are not limited to, the exercise price, the time or
times when Options may be exercised (which may be based on performance
criteria), any vesting acceleration or waiver of forfeiture restrictions, and
any restriction or limitation regarding any Option  or the shares of Common
Stock relating thereto, based in each case on such factors as the Administrator,
in its sole discretion, shall determine;

            (vii)   to reduce the exercise price of any Option to the then
current Fair Market Value if the Fair Market Value of the Common Stock covered
by such Option shall have declined since the date the Option was granted;

            (viii)  to institute an Option Exchange Program;

            (ix)    to construe and interpret the terms of the Plan and awards
granted pursuant to the Plan;

            (x) to prescribe, amend and rescind rules and regulations relating
to the Plan, including rules and regulations relating to sub-plans established
for the purpose of qualifying for preferred tax treatment under foreign tax
laws;

            (xi)    to modify or amend each Option (subject to Section 15(b) of
the Plan), including the discretionary authority to extend the post-termination
exercisability period of Options longer than is otherwise provided for in the
Plan;

            (xii)   to authorize any person to execute on behalf of the Company
any instrument required to effect the grant of an Option or  previously granted
by the Administrator;


                                      -4-

<PAGE>

            (xiii)  to determine the terms and restrictions applicable to
Options; 

            (xiv)   to allow Optionees to satisfy withholding tax obligations by
electing to have the Company withhold from the Shares to be issued upon exercise
of an Option or Stock Purchase Right that number of Shares having a Fair Market
Value equal to the amount required to be withheld.  The Fair Market Value of the
Shares to be withheld shall be determined on the date that the amount of tax to
be withheld is to be determined.  All elections by an Optionee to have Shares
withheld for this purpose shall be made in such form and under such conditions
as the Administrator may deem necessary or advisable; and

            (xv)    to make all other determinations deemed necessary or
advisable for administering the Plan.

        (d) EFFECT OF ADMINISTRATOR'S DECISION.  The Administrator's decisions,
determinations and interpretations shall be final and binding on all Optionees
and any other holders of Options.

    5.  ELIGIBILITY.  Options may be granted to Service Providers.

    6.  LIMITATION.  Neither the Plan nor any Option shall confer upon an
Optionee any right with respect to continuing the Optionee's relationship as a
Service Provider with the Company, nor shall they interfere in any way with the
Optionee's right or the Company's right to terminate such relationship at any
time, with or without cause.

    7.  TERM OF PLAN.  The Plan shall become effective upon its adoption by the
Board.  It shall continue in effect for ten (10) years, unless sooner terminated
under Section 14 of the Plan. 

    8.  TERM OF OPTION.  The term of each Option shall be stated in the Option
Agreement. 

    9.  OPTION EXERCISE PRICE AND CONSIDERATION.

        (a) EXERCISE PRICE.  The per share exercise price for the Shares to be
issued pursuant to exercise of an Option shall be determined by the
Administrator.

        (b) WAITING PERIOD AND EXERCISE DATES.  At the time an Option is
granted, the Administrator shall fix the period within which the Option may be
exercised and shall determine any conditions which must be satisfied before the
Option may be exercised.

        (c) FORM OF CONSIDERATION.  The Administrator shall determine the
acceptable form of consideration for exercising an Option, including the method
of payment.  Such consideration may consist entirely of:

            (i) cash;


                                      -5-

<PAGE>

            (ii)    check;

            (iii)   promissory note;

            (iv)    other Shares which (A) in the case of Shares acquired upon
exercise of an option, have been owned by the Optionee for more than six months
on the date of surrender, and (B) have a Fair Market Value on the date of
surrender equal to the aggregate exercise price of the Shares as to which said
Option shall be exercised;

            (v) consideration received by the Company under a cashless exercise
program implemented by the Company in connection with the Plan;

            (vi)    a reduction in the amount of any Company liability to the
Optionee, including any liability attributable to the Optionee's participation
in any Company-sponsored deferred compensation program or arrangement;

            (vii)   such other consideration and method of payment for the
issuance of Shares to the extent permitted by Applicable Laws; or

            (viii)  any combination of the foregoing methods of payment.

    10. EXERCISE OF OPTION.

        (a) PROCEDURE FOR EXERCISE; RIGHTS AS A SHAREHOLDER. Any Option granted
hereunder shall be exercisable according to the terms of the Plan and at such
times and under such conditions as determined by the Administrator and set forth
in the Option Agreement.  An Option may not be exercised for a fraction of a
Share.

            An Option shall be deemed exercised when the Company receives: (i)
written or electronic notice of exercise (in accordance with the Option
Agreement) from the person entitled to exercise the Option, and (ii) full
payment for the Shares with respect to which the Option is exercised.  Full
payment may consist of any consideration and method of payment authorized by the
Administrator and permitted by the Option Agreement and the Plan.  Shares issued
upon exercise of an Option shall be issued in the name of the Optionee or, if
requested by the Optionee, in the name of the Optionee and his or her spouse. 
Until the Shares are issued (as evidenced by the appropriate entry on the books
of the Company or of a duly authorized transfer agent of the Company), no right
to vote or receive dividends or any other rights as a shareholder shall exist
with respect to the Optioned Stock, notwithstanding the exercise of the Option. 
The Company shall issue (or cause to be issued) such Shares promptly after the
Option is exercised.  No adjustment will be made for a dividend or other right
for which the record date is prior to the date the Shares are issued, except as
provided in Section 13 of the Plan.


                                      -6-

<PAGE>

            Exercising an Option in any manner shall decrease the number of
Shares thereafter available, both for purposes of the Plan and for sale under
the Option, by the number of Shares as to which the Option is exercised.

        (b) TERMINATION OF RELATIONSHIP AS A SERVICE PROVIDER.  If an 
Optionee ceases to be a Service Provider, other than upon the Optionee's 
death or Disability, the Optionee may exercise his or her Option, but only 
within such period of time as is specified in the Option Agreement, and only 
to the extent that the Option is vested on the date of termination (but in no 
event later than the expiration of the term of such Option as set forth in 
the Option Agreement). In the absence of a specified time in the Option 
Agreement, the Option shall remain exercisable for three (3) months following 
the Optionee's termination. If, on the date of termination, the Optionee is 
not vested as to his or her entire Option, the Shares covered by the unvested 
portion of the Option shall revert to the Plan.  If, after termination, the 
Optionee does not exercise his or her Option within the time specified by the 
Administrator, the Option shall terminate, and the Shares covered by such 
Option shall revert to the Plan.

        (c) DISABILITY OF OPTIONEE.  If an Optionee ceases to be a Service
Provider as a result of the Optionee's Disability, the Optionee may exercise his
or her Option within such period of time as is specified in the Option
Agreement, to the extent the Option is vested on the date of termination (but in
no event later than the expiration of the term of such Option as set forth in
the Option Agreement).  In the absence of a specified time in the Option
Agreement, the Option shall remain exercisable for twelve (12) months following
the Optionee's termination.  If, on the date of termination, the Optionee is not
vested as to his or her entire Option, the Shares covered by the unvested
portion of the Option shall revert to the Plan.  If, after termination, the
Optionee does not exercise his or her Option within the time specified herein,
the Option shall terminate, and the Shares covered by such Option shall revert
to the Plan.

        (d) DEATH OF OPTIONEE.  If an Optionee dies while a Service Provider,
the Option may be exercised within such period of time as is specified in the
Option Agreement (but in no event later than the expiration of the term of such
Option as set forth in the Notice of Grant), by the Optionee's estate or by a
person who acquires the right to exercise the Option by bequest or inheritance,
but only to the extent that the Option is vested on the date of death.  In the
absence of a specified time in the Option Agreement, the Option shall remain
exercisable for twelve (12) months following the Optionee's termination.  If, at
the time of death, the Optionee is not vested as to his or her entire Option,
the Shares covered by the unvested portion of the Option shall immediately
revert to the Plan.  The Option may be exercised by the executor or
administrator of the Optionee's estate or, if none, by the person(s) entitled to
exercise the Option under the Optionee's will or the laws of descent or
distribution.  If the Option is not so exercised within the time specified
herein, the Option shall terminate, and the Shares covered by such Option shall
revert to the Plan.

        (e) BUYOUT PROVISIONS.  The Administrator may at any time offer to buy
out for a payment in cash or Shares, an Option previously granted based on such
terms and conditions as the Administrator shall establish and communicate to the
Optionee at the time that such offer is made.


                                      -7-

<PAGE>

    11. NON-TRANSFERABILITY OF OPTIONS .  Unless determined otherwise by the
Administrator, an Option may not be sold, pledged, assigned, hypothecated,
transferred, or disposed of in any manner other than by will or by the laws of
descent or distribution and may be exercised, during the lifetime of the
Optionee, only by the Optionee.  If the Administrator makes an Option
transferable, such Option shall contain such additional terms and conditions as
the Administrator deems appropriate.

    12. ADJUSTMENTS UPON CHANGES IN CAPITALIZATION, DISSOLUTION, MERGER OR
        ASSET SALE. 

        (a) CHANGES IN CAPITALIZATION.  Subject to any required action by the
shareholders of the Company, the number of shares of Common Stock covered by
each outstanding Option, and the number of shares of Common Stock which have
been authorized for issuance under the Plan but as to which no Options have yet
been granted or which have been returned to the Plan upon cancellation or
expiration of an Option, as well as the price per share of Common Stock covered
by each such outstanding Option, shall be proportionately adjusted for any
increase or decrease in the number of issued shares of Common Stock resulting
from a stock split, reverse stock split, stock dividend, combination or
reclassification of the Common Stock, or any other increase or decrease in the
number of issued shares of Common Stock effected without receipt of
consideration by the Company; provided, however, that conversion of any
convertible securities of the Company shall not be deemed to have been "effected
without receipt of consideration."  Such adjustment shall be made by the Board,
whose determination in that respect shall be final, binding and conclusive. 
Except as expressly provided herein, no issuance by the Company of shares of
stock of any class, or securities convertible into shares of stock of any class,
shall affect, and no adjustment by reason thereof shall be made with respect to,
the number or price of shares of Common Stock subject to an Option. 

        (b) DISSOLUTION OR LIQUIDATION.  In the event of the proposed
dissolution or liquidation of the Company, the Administrator shall notify each
Optionee as soon as practicable prior to the effective date of such proposed
transaction.  The Administrator in its discretion may provide for an Optionee to
have the right to exercise his or her Option until ten (10) days prior to such
transaction as to all of the Optioned Stock covered thereby, including Shares as
to which the Option would not otherwise be exercisable.  In addition, the
Administrator may provide that any Company repurchase option applicable to any
Shares purchased upon exercise of an Option shall lapse as to all such Shares,
provided the proposed dissolution or liquidation takes place at the time and in
the manner contemplated.  To the extent it has not been previously exercised, an
Option will terminate immediately prior to the consummation of such proposed
action.

        (c) MERGER OR ASSET SALE.  In the event of a merger of the Company with
or into another corporation, or the sale of substantially all of the assets of
the Company, each outstanding Option shall be assumed or an equivalent option or
right substituted by the successor corporation or a Parent or Subsidiary of the
successor corporation.  In the event that the successor corporation refuses to
assume or substitute for the Option, the Optionee shall fully vest in and have
the right to exercise the Option as to all of the Optioned Stock, including
Shares as to which it would not otherwise be vested or exercisable.  If an
Option becomes fully vested and exercisable in lieu of assumption or
substitution in the event of a merger or sale of assets, the Administrator shall
notify the Optionee in


                                      -8-

<PAGE>

writing or electronically that the Option shall be fully vested and 
exercisable for a period of fifteen (15) days from the date of such notice, 
and the Option shall terminate upon the expiration of such period.  For the 
purposes of this paragraph, the Option shall be considered assumed if, 
following the merger or sale of assets, the option or right confers the right 
to purchase or receive, for each Share of Optioned Stock, immediately prior 
to the merger or sale of assets, the consideration (whether stock, cash, or 
other securities or property) received in the merger or sale of assets by 
holders of Common Stock for each Share held on the effective date of the 
transaction (and if holders were offered a choice of consideration, the type 
of consideration chosen by the holders of a majority of the outstanding 
Shares); provided, however, that if such consideration received in the merger 
or sale of assets is not solely common stock of the successor corporation or 
its Parent, the Administrator may, with the consent of the successor 
corporation, provide for the consideration to be received upon the exercise 
of the Option, for each Share of Optioned Stock to be solely common stock of 
the successor corporation or its Parent equal in fair market value to the per 
share consideration received by holders of Common Stock in the merger or sale 
of assets.

    13. DATE OF GRANT.  The date of grant of an Option shall be, for all
purposes, the date on which the Administrator makes the determination granting
such Option, or such other later date as is determined by the Administrator. 
Notice of the determination shall be provided to each Optionee within a
reasonable time after the date of such grant.

    14. AMENDMENT AND TERMINATION OF THE PLAN.

        (a) AMENDMENT AND TERMINATION.  The Board may at any time amend, alter,
suspend or terminate the Plan.  

        (b) EFFECT OF AMENDMENT OR TERMINATION.  No amendment, alteration,
suspension or termination of the Plan shall impair the rights of any Optionee,
unless mutually agreed otherwise between the Optionee and the Administrator,
which agreement must be in writing and signed by the Optionee and the Company. 
Termination of the Plan shall not affect the Administrator's ability to exercise
the powers granted to it hereunder with respect to options granted under the
Plan prior to the date of such termination.

    15. CONDITIONS UPON ISSUANCE OF SHARES.  

        (a) LEGAL COMPLIANCE.  Shares shall not be issued pursuant to the
exercise of an Option unless the exercise of such Option and the issuance and
delivery of such Shares shall comply with Applicable Laws and shall be further
subject to the approval of counsel for the Company with respect to such
compliance.

        (b) INVESTMENT REPRESENTATIONS.  As a condition to the exercise of an
Option the Company may require the person exercising such Option  to represent
and warrant at the time of any such exercise that the Shares are being purchased
only for investment and without any present


                                      -9-

<PAGE>

intention to sell or distribute such Shares if, in the opinion of counsel for 
the Company, such a representation is required.

    16. INABILITY TO OBTAIN AUTHORITY.  The inability of the Company to obtain
authority from any regulatory body having jurisdiction, which authority is
deemed by the Company's counsel to be necessary to the lawful issuance and sale
of any Shares hereunder, shall relieve the Company of any liability in respect
of the failure to issue or sell such Shares as to which such requisite authority
shall not have been obtained.

    17. RESERVATION OF SHARES.  The Company, during the term of this Plan, will
at all times reserve and keep available such number of Shares as shall be
sufficient to satisfy the requirements of the Plan.


                                      -10-

<PAGE>

                         QUICKTURN DESIGN SYSTEMS, INC.

                          1996 SUPPLEMENTAL STOCK PLAN

                             STOCK OPTION AGREEMENT


    Unless otherwise defined herein, the terms defined in the Plan shall have
the same defined meanings in this Option Agreement.

I.  NOTICE OF STOCK OPTION GRANT

[Optionee's Name and Address]

    You have been granted an option to purchase Common Stock of the Company,
subject to the terms and conditions of the Plan and this Option Agreement, as
follows:

    Grant Number                         _______________________

    Date of Grant                        _______________________

    Vesting Commencement Date            _______________________

    Exercise Price per Share            $_______________________

    Total Number of Shares Granted       _______________________

    Total Exercise Price                $_______________________

    Type of Option:                     Nonstatutory Stock Option

    Term/Expiration Date:               _______________________


    VESTING SCHEDULE:

    This Option may be exercised, in whole or in part, in accordance with the
following schedule:

        25% of the Shares subject to the Option shall vest twelve months after
the Vesting Commencement Date, and 1/48 of the Shares subject to the Option
shall vest each month thereafter, subject to your continuing to be a Service
Provider on such dates.


<PAGE>

    TERMINATION PERIOD:

    This Option may be exercised for 30 days after Optionee ceases to be a
Service Provider.  Upon the death or Disability of the Optionee, this Option may
be exercised for such longer period as provided in the Plan.  In no event shall
this Option be exercised later than the Term/Expiration Date as provided above.


II.  AGREEMENT

    1.  GRANT OF OPTION.  The Plan Administrator of the Company hereby grants
to the Optionee named in the Notice of Grant attached as Part I of this
Agreement (the "Optionee") an option (the "Option") to purchase the number of
Shares, as set forth in the Notice of Grant, at the exercise price per share set
forth in the Notice of Grant (the "Exercise Price"), subject to the terms and
conditions of the Plan, which is incorporated herein by reference.  Subject to
Section 15(b) of the Plan, in the event of a conflict between the terms and
conditions of the Plan and the terms and conditions of this Option Agreement,
the terms and conditions of the Plan shall prevail.

    2.  EXERCISE OF OPTION.

        (a) RIGHT TO EXERCISE.  This Option is exercisable during its term in
accordance with the Vesting Schedule set out in the Notice of Grant and the
applicable provisions of the Plan and this Option Agreement.

        (b) METHOD OF EXERCISE.  This Option is exercisable by delivery of an
exercise notice, in the form attached as Exhibit A (the "Exercise Notice"),
which shall state the election to exercise the Option, the number of Shares in
respect of which the Option is being exercised (the "Exercised Shares"), and
such other representations and agreements as may be required by the Company
pursuant to the provisions of the Plan.  The Exercise Notice shall be completed
by the Optionee and delivered to the Company.  The Exercise Notice shall be
accompanied by payment of the aggregate Exercise Price as to all Exercised
Shares.  This Option shall be deemed to be exercised upon receipt by the Company
of such fully executed Exercise Notice accompanied by such aggregate Exercise
Price.

        No Shares shall be issued pursuant to the exercise of this Option
unless such issuance and exercise complies with Applicable Laws.  Assuming such
compliance, for income tax purposes the Exercised Shares shall be considered
transferred to the Optionee on the date the Option is exercised with respect to
such Exercised Shares.

    3.  METHOD OF PAYMENT.  Payment of the aggregate Exercise Price shall be by
any of the following, or a combination thereof, at the election of the Optionee:

        (a) cash; 


                                      -2-

<PAGE>

        (b) check; 

        (c) consideration received by the Company under a cashless exercise
program implemented by the Company in connection with the Plan; or 

        (d) surrender of other Shares which (i) in the case of Shares acquired
upon exercise of an option, have been owned by the Optionee for more than six
(6) months on the date of surrender, AND (ii) have a Fair Market Value on the
date of surrender equal to the aggregate Exercise Price of the Exercised Shares;
or

    4.  NON-TRANSFERABILITY OF OPTION.  This Option may not be transferred in
any manner otherwise than by will or by the laws of descent or distribution and
may be exercised during the lifetime of Optionee only by the Optionee.  The
terms of the Plan and this Option Agreement shall be binding upon the executors,
administrators, heirs, successors and assigns of the Optionee.

    5.  TERM OF OPTION.  This Option may be exercised only within the term set
out in the Notice of Grant, and may be exercised during such term only in
accordance with the Plan and the terms of this Option Agreement.

    6.  TAX CONSEQUENCES.  Some of the federal tax consequences relating to
this Option, as of the date of this Option, are set forth below.  THIS SUMMARY
IS NECESSARILY INCOMPLETE, AND THE TAX LAWS AND REGULATIONS ARE SUBJECT TO
CHANGE.  THE OPTIONEE SHOULD CONSULT A TAX ADVISER BEFORE EXERCISING THIS OPTION
OR DISPOSING OF THE SHARES.

        (a) EXERCISING THE OPTION.  The Optionee may incur regular federal
income tax liability upon exercise of an NSO.  The Optionee will be treated as
having received compensation income (taxable at ordinary income tax rates) equal
to the excess, if any, of the Fair Market Value of the Exercised Shares on the
date of exercise over their aggregate Exercise Price.  If the Optionee is an
Employee or a former Employee, the Company will be required to withhold from his
or her compensation or collect from Optionee and pay to the applicable taxing
authorities an amount in cash equal to a percentage of this compensation income
at the time of exercise, and may refuse to honor the exercise and refuse to
deliver Shares if such withholding amounts are not delivered at the time of
exercise.

        (b) DISPOSITION OF SHARES.  If the Optionee holds NSO Shares for at
least one year, any gain realized on disposition of the Shares will be treated
as long-term capital gain for federal income tax purposes.

    7.  ENTIRE AGREEMENT; GOVERNING LAW.  The Plan is incorporated herein by
reference.  The Plan and this Option Agreement constitute the entire agreement
of the parties with respect to the subject matter hereof and supersede in their
entirety all prior undertakings and agreements of the Company and Optionee with
respect to the subject matter hereof, and may not be modified adversely


                                      -3-

<PAGE>

to the Optionee's interest except by means of a writing signed by the Company 
and Optionee.  This agreement is governed by the internal substantive laws, 
but not the choice of law rules, of California.

    8.  NO GUARANTEE OF CONTINUED SERVICE.  OPTIONEE ACKNOWLEDGES AND AGREES
THAT THE VESTING OF SHARES PURSUANT TO THE VESTING SCHEDULE HEREOF IS EARNED
ONLY BY CONTINUING AS A SERVICE PROVIDER AT THE WILL OF THE COMPANY (AND NOT
THROUGH THE ACT OF BEING HIRED, BEING GRANTED AN OPTION OR PURCHASING SHARES
HEREUNDER).  OPTIONEE FURTHER ACKNOWLEDGES AND AGREES THAT THIS AGREEMENT, THE
TRANSACTIONS CONTEMPLATED HEREUNDER AND THE VESTING SCHEDULE SET FORTH HEREIN DO
NOT CONSTITUTE AN EXPRESS OR IMPLIED PROMISE OF CONTINUED ENGAGEMENT AS A
SERVICE PROVIDER FOR THE VESTING PERIOD, FOR ANY PERIOD, OR AT ALL, AND SHALL
NOT INTERFERE WITH OPTIONEE'S RIGHT OR THE COMPANY'S RIGHT TO TERMINATE
OPTIONEE'S RELATIONSHIP AS A SERVICE PROVIDER AT ANY TIME, WITH OR WITHOUT
CAUSE.


    By your signature and the signature of the Company's representative 
below, you and the Company agree that this Option is granted under and 
governed by the terms and conditions of the Plan and this Option Agreement.  
Optionee has reviewed the Plan and this Option Agreement in their entirety, 
has had an opportunity to obtain the advice of counsel prior to executing 
this Option Agreement and fully understands all provisions of the Plan and 
Option Agreement. Optionee hereby agrees to accept as binding, conclusive and 
final all decisions or interpretations of the Administrator upon any 
questions relating to the Plan and Option Agreement.  Optionee further agrees 
to notify the Company upon any change in the residence address indicated 
below.

OPTIONEE:                               QUICKTURN DESIGN SYSTEMS, INC.



___________________________________     ______________________________________
Signature                               By

___________________________________     ______________________________________
Print Name                              Title

___________________________________ 
Residence Address

___________________________________ 



                                      -4-

<PAGE>

                                    EXHIBIT A

                          1996 SUPPLEMENTAL STOCK PLAN

                                 EXERCISE NOTICE


Quickturn Design Systems, Inc.
440 Clyde Avenue
Mountain View, CA  94043

Attention:  Secretary

    1.  EXERCISE OF OPTION.  Effective as of today, ________________, 199__,
the undersigned ("Purchaser") hereby elects to purchase ______________ shares
(the "Shares") of the Common Stock of Quickturn Design Systems, Inc. (the
"Company") under and pursuant to the 1996 Supplemental Stock Plan (the "Plan")
and the Stock Option Agreement dated _________________, 19___ (the "Option
Agreement").  The purchase price for the Shares shall be $_____________, as
required by the Option Agreement.

    2.  DELIVERY OF PAYMENT.  Purchaser herewith delivers to the Company the
full purchase price for the Shares.

    3.  REPRESENTATIONS OF PURCHASER.  Purchaser acknowledges that Purchaser
has received, read and understood the Plan and the Option Agreement and agrees
to abide by and be bound by their terms and conditions.

    4.  RIGHTS AS SHAREHOLDER.  Until the issuance (as evidenced by the
appropriate entry on the books of the Company or of a duly authorized transfer
agent of the Company) of the Shares, no right to vote or receive dividends or
any other rights as a shareholder shall exist with respect to the Optioned
Stock, notwithstanding the exercise of the Option.  The Shares so acquired shall
be issued to the Optionee as soon as practicable after exercise of the Option. 
No adjustment will be made for a dividend or other right for which the record
date is prior to the date of issuance, except as provided in Section 13 of the
Plan.

    5.  TAX CONSULTATION.  Purchaser understands that Purchaser may suffer
adverse tax consequences as a result of Purchaser's purchase or disposition of
the Shares.  Purchaser represents that Purchaser has consulted with any tax
consultants Purchaser deems advisable in connection with the purchase or
disposition of the Shares and that Purchaser is not relying on the Company for
any tax advice.

    6.  ENTIRE AGREEMENT; GOVERNING LAW.  The Plan and Option Agreement are
incorporated herein by reference.  This Agreement, the Plan and the Option
Agreement constitute the entire 



<PAGE>

agreement of the parties with respect to the subject matter hereof and 
supersede in their entirety all prior undertakings and agreements of the 
Company and Purchaser with respect to the subject matter hereof, and may not 
be modified adversely to the Purchaser's interest except by means of a 
writing signed by the Company and Purchaser.  This agreement is governed by 
the internal substantive laws, but not the choice of law rules, of 
California. 

Submitted by:                           Accepted by:

PURCHASER:                              QUICKTURN DESIGN SYSTEMS, INC.


__________________________________      _____________________________________
Signature                               By:

__________________________________      _____________________________________
Print Name                              Its:


Address:                                Address:
- --------                                --------


_________________________________       440 Clyde Avenue    
_________________________________       Mountain View, CA  94043


                                        _____________________________________
                                        Date Received



                                     -2-


<PAGE>

                                                              EXHIBIT 5.1

                         WILSON SONSINI GOODRICH & ROSATI
                             PROFESSIONAL CORPORATION

                                650 PAGE MILL ROAD
                      PALO ALTO, CALIFORNIA  94304-1050
                TELEPHONE 415-493-9300  FACSIMILE 415-493-6811


                                        
                                December 20, 1996


Quickturn Design Systems, Inc.
440 Clyde Avenue
Mountain View, California  94043

     RE:  REGISTRATION STATEMENT ON FORM S-8

Ladies and Gentlemen:

     We have examined the Registration Statement on Form S-8 (the "Registration
Statement") to be filed by Quickturn Design Systems, Inc. (the "Registrant" or
"you"), with the Securities and Exchange Commission on or about December 20, 
1996, in connection with the registration under the Securities Act of 1933, 
as amended, of 1,000,000 shares of your Common Stock (the "Shares") reserved 
for issuance under the 1996 Supplemental Stock Plan (the "Plan").  As your 
legal counsel, we have examined the actions taken and proposed to be taken by 
you in connection with the proposed issuance, sale and payment of 
consideration for the Shares to be issued under the Plan.

     It is our opinion that, upon completion of the actions being taken, or
contemplated by us as your counsel to be taken by you prior to the issuance of
the Shares pursuant to the Registration Statement and the Plan, and upon
completion of the actions being taken in order to permit such transactions to be
carried out in accordance with the securities laws of the various states where
required, the Shares will be legally and validly issued, fully paid and non-
assessable.

     We consent to the use of this opinion as an exhibit to the Registration
Statement and further consent to the use of our name wherever appearing in the
Registration Statement and any amendments thereto.

                              Sincerely,

                              WILSON, SONSINI, GOODRICH & ROSATI
                              Professional Corporation
                              /s/ Wilson, Sonsini, Goodrich & Rosati





<PAGE>

                                                             EXHIBIT 23.2


                      CONSENT OF INDEPENDENT ACCOUNTANTS


We consent to the incorporation by reference in this Registration Statement 
on Form S-8 pertaining to the 1996 Supplemental Stock Plan of Quickturn 
Design Systems, Inc. of our report dated January 18, 1996, on our audits of 
the consolidated financial statements and financial statement schedules of 
Quickturn Design Systems, Inc. as of December 31, 1995 and 1994 and for the 
years ended December 31, 1995, 1994, and 1993, which report is incorporated 
by reference in the Annual Report on Form 10-K for the year ended December 
31, 1995, filed with the Securities and Exchange Commission.

                                        /s/ Coopers & Lybrand L.L.P.



San Jose, California
December 17, 1996




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