QUICKTURN DESIGN SYSTEMS INC
SC 14D9/A, 1998-09-24
INSTRUMENTS FOR MEAS & TESTING OF ELECTRICITY & ELEC SIGNALS
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<PAGE>
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
                       SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549
 
                               ----------------
 
                                 SCHEDULE 14D-9
                               (AMENDMENT NO. 9)
 
                               ----------------
 
               Solicitation/Recommendation Statement Pursuant to
            Section 14(d)(4) of the Securities Exchange Act of 1934
 
                         QUICKTURN DESIGN SYSTEMS, INC.
                           (Name of Subject Company)
 
                         QUICKTURN DESIGN SYSTEMS, INC.
                      (Name of Person(s) Filing Statement)
 
                    COMMON STOCK, PAR VALUE $.001 PER SHARE
           (including the associated preferred stock purchase rights)
                         (Title of Class of Securities)
 
                               ----------------
 
                                   74838E102
                     (CUSIP Number of Class of Securities)
 
                               ----------------
 
                                 KEITH R. LOBO
                     PRESIDENT AND CHIEF EXECUTIVE OFFICER
                         QUICKTURN DESIGN SYSTEMS, INC.
                               55 W. TRIMBLE ROAD
                           SAN JOSE, CALIFORNIA 95131
                                 (408) 914-6000
      (Name, address and telephone number of person authorized to receive
       notice and communications on behalf of person(s) filing statement)
 
                               ----------------
 
                                    COPY TO:
 
                             LARRY W. SONSINI, ESQ.
                        WILSON SONSINI GOODRICH & ROSATI
                            PROFESSIONAL CORPORATION
                               650 PAGE MILL ROAD
                        PALO ALTO, CALIFORNIA 94304-1050
                                 (650) 493-9300
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>
 
                                 INTRODUCTION
 
  The Solicitation/Recommendation Statement on Schedule 14D-9 (the "Schedule
14D-9") originally filed on August 24, 1998, by Quickturn Design Systems,
Inc., a Delaware corporation (the "Company" or "Quickturn"), relates to an
offer by MGZ Corp., a Delaware corporation ("MGZ") and a wholly owned
subsidiary of Mentor Graphics Corporation, an Oregon corporation ("Mentor"),
to purchase all of the outstanding shares of the common stock, par value $.001
per share (including the associated preferred stock purchase rights), of the
Company. All capitalized terms used herein without definition have the
respective meanings set forth in the Schedule 14D-9.
 
ITEM 8. ADDITIONAL INFORMATION TO BE FURNISHED
 
  The response to Item 8 is hereby amended by adding the following to the end
of the last paragraph of the section entitled "Litigation Concerning the
Offer":
 
    On September 21, 1998, Quickturn filed a motion for leave to file its
  Second Amended and Supplemental Counterclaims against Mentor Graphics in
  the United States District Court for the District of Delaware, Civil Action
  No. 98-473-RRM ("Second Amended Counterclaims"). In its Second Amended
  Counterclaims, Quickturn alleges that Mentor's proposed nominees for a new
  Quickturn board are ill-equipped to manage the company based on their lack
  of knowledge and experience, that Mentor has not disclosed the risk that
  its financing for the tender offer and second-step merger may expire prior
  to the proposed merger being completed, and that the true purpose for the
  transaction is not to benefit the combined company's customers but rather
  to eliminate the patent litigation pending between Quickturn and Mentor. On
  September 22, 1998, Quickturn's motion for leave to file the Second Amended
  Counterclaims was granted. Quickturn's motion for leave is filed as Exhibit
  33 hereto and is incorporated herein by reference. Quickturn's Second
  Amended Counterclaims is filed as Exhibit 34 hereto and is incorporated
  herein by reference.
 
    The response to Item 8 is hereby amended by adding the following to the
  end of the section entitled "Proxy Solicitation."
 
    On September 23, 1998 the Company filed additional definitive proxy and
  solicitation materials with the SEC. A copy of the such materials is
  attached as Exhibit 35 hereto and incorporated herein by reference.
 
ITEM 9. MATERIAL TO BE FILED AS EXHIBITS
 
  The response to Item 9 is hereby amended by the addition of the following
new exhibits:
 
<TABLE>
   <C>        <S>
   Exhibit 33 Motion for leave to file Second Amendment and Supplemental
               Counterclaims.
   Exhibit 34 Second Amendment and Supplemental Counterclaims.
   Exhibit 35 Additional Proxy and Solicitation Materials of the Company filed
              with the SEC on September 23, 1998.
</TABLE>
 
                                       2
<PAGE>
 
                                   SIGNATURE
 
  After reasonable inquiry and to the best of its knowledge and belief, the
undersigned certifies that the information set forth in this statement is
true, complete and correct.
 
<TABLE>
 <C>                                         <S>
 Dated: September 23, 1998                   QUICKTURN DESIGN SYSTEMS, INC.
</TABLE>
 
                                          By:/s/ Keith R. Lobo
                                             ----------------------------------
                                             Keith R. Lobo
                                             President and Chief Executive
                                              Officer
 
                                       3

<PAGE>
                                                                    EXHIBIT 33
 
                     IN THE UNITED STATES DISTRICT COURT

                        FOR THE DISTRICT OF DELAWARE

MENTOR GRAPHICS CORPORATION,    )
and MGZ CORP.,                  )
                                )
     Plaintiffs,                )
                                )
     v.                         )       Civil Action No. 98-473-RRM
                                )
QUICKTURN DESIGN SYSTEMS, INC., )
                                )
     Defendant.                 )
________________________________)
QUICKTURN DESIGN SYSTEMS, INC., )
                                )
     Counterclaimant,           )
                                )
     v.                         )
                                )
MENTOR GRAPHICS CORPORATION,    )
MGZ CORP., WALDEN C. RHINES,    )
GREGORY K. HINCKLEY, DEAN M.    )
FREED, GIDEON ARGOV, SCOTT H.   )
BICE, HARRY L. DEMOREST,        )
C. SCOTT GIBSON and MICHAEL J.K.)
SAVAGE,                         )
                                )
     Counterclaim-defendants.   )


                   MOTION FOR LEAVE TO FILE SECOND AMENDED
                       AND SUPPLEMENTAL COUNTERCLAIMS
                       ------------------------------
                                        
                Pursuant to Fed. Rule Civ. Proc. 15(a), counterclaimant

Quickturn Design Systems, Inc. ("Quickturn"), hereby moves the Court for an

Order in the form attached hereto granting Quickturn leave to file its Second

Amended and Supplemental Counterclaims in the form attached hereto as Exhibit

A./1/ The grounds for this motion are as follows:

____________________

/1/     Pursuant to Local Rule 15.1, a black-lined copy of the Second Amended
        and Supplemental Counterclaims reflecting changes from the Amended and
        Supplemental Counterclaims filed on September 14, 1998 is attached
        hereto as Exhibit B.
<PAGE>
 
        1.      Quickturn has learned of the existence of additional facts

that merit the assertion of additional counterclaims and theories of relief.

        2.      It is well-established that leave to amend a pleading "shall

be freely given when justice so requires." Fed. R. Civ. Proc. 15(a); Foman v.
                                                                     --------

Davis, 371 U.S. 178, 182 (1962); ("In the absence of any apparent or declared
- -----

reason . . .the leave sought should, as the rules require, be `freely

given.'"); Coventry v. U.S. Steel Corp., 856 F.2d 514, 520 (3d Cir. 1988);
           ----------------------------

DRR, L.L.C. v. Sears, Roebuck & Co., 171 F.R.D. 162, 166 (D. Del. 1997).
- -----------------------------------                                     

        3.      For the foregoing reasons, Quickturn's motion for leave to

file its Second Amended and Supplemental Counterclaims should be granted.


                              MORRIS, NICHOLS, ARSHT & TUNNELL


                              /s/ William M. Lafferty  
                              _____________________________________
                              Kenneth J. Nachbar (#2067)
                              William M. Lafferty (#2755)
                              Donna L. Culver (#2983)
                              1201 N. Market Street
                              P.O. Box 1347
                              Wilmington, DE  19899
                              (302) 658-9200
                                Attorneys for Counterclaimant
                                Quickturn Design Systems, Inc.
OF COUNSEL:

James A. DiBoise
David J. Berger
Wilson Sonsini Goodrich & Rosati, PC
650 Page Mill Road
Palo Alto, CA  94304-1050
(650) 493-9300


September 21, 1998

                                      -2-
<PAGE>
 
                     IN THE UNITED STATES DISTRICT COURT

                        FOR THE DISTRICT OF DELAWARE

MENTOR GRAPHICS CORPORATION,    )
and MGZ CORP.,                  )
                                )
  Plaintiffs,                   )
                                )
  v.                            )       Civil Action No. 98-473-RRM
                                )
QUICKTURN DESIGN SYSTEMS, INC., )
                                )
  Defendant.                    )
________________________________)
QUICKTURN DESIGN SYSTEMS, INC., )
                                )
  Counterclaimant,              )
                                )
  v.                            )
                                )
MENTOR GRAPHICS CORPORATION,    )
MGZ CORP., WALDEN C. RHINES,    )
GREGORY K. HINCKLEY, DEAN M.    )
FREED, GIDEON ARGOV, SCOTT H.   )
BICE, HARRY L. DEMOREST,        )
C. SCOTT GIBSON and MICHAEL J.K.)
SAVAGE,                         )
                                )
  Counterclaim-defendants.      )


                                    ORDER
                                    -----
                                        
         The Court having considered counterclaimant Quickturn Design Systems,

Inc. ("Quickturn")'s Motion for Leave to File its Second Amended and

Supplemental Counterclaims;
         
         IT IS HEREBY ORDERED this __ day of September, 1998 that:

         1.     Quickturn's Motion for Leave to File its Second Amended and

Supplemental Counterclaims is GRANTED, and Quickturn is hereby given leave to

file its Second Amended and Supplemental Counterclaims; and
<PAGE>
 
         2.     The counterclaim-defendants shall move, answer or otherwise

respond to the Second Amended and Supplemental Counterclaims within ten (10)

days of the service thereof or at such other earlier time as may be further

ordered by the Court.



                                    /s/ Roderick R. McKelvie
                              ___________________________________________
                                    The Honorable Roderick R. McKelvie

                                     -2-
<PAGE>
 
                 CERTIFICATION PURSUANT TO LOCAL RULE 7.1.1
                 ------------------------------------------

          Pursuant to Local Rule 7.1.1, I hereby certify that I have made a

reasonable effort to reach agreement with opposing counsel on the matters set

forth in the foregoing motion, but at this time, counsel for the

plaintiffs/counterdefendants have not taken a definitive position with respect

to this motion.



                                            /s/ William M. Lafferty
                                 _____________________________________________ 
                                                William M. Lafferty
<PAGE>
 
                           CERTIFICATE OF SERVICE
                           ----------------------


          I hereby certify that on September 21, 1998, two copies of the

foregoing Motion for Leave to File Second Amended and Supplemental Counterclaims

were served upon the following counsel of record:

VIA HAND DELIVERY                      VIA OVERNIGHT MAIL
- -----------------                      ------------------

Kevin G. Abrams, Esquire               Christopher L. Kaufman, Esquire
Richards, Layton & Finger              Latham & Watkins
One Rodney Square, P.O. Box 511        75 Willow Road
Wilmington, Delaware 19899             Menlo Park, California  94025

Norman M. Monhait, Esquire
Rosenthal, Monhait, Gross & Goddess, P.A.
Suite 1401, Mellon Bank Center
P.O. Box 1070
Wilmington, Delaware 19899


                                             /s/ William M. Lafferty
                                        -------------------------------------
                                                 William M. Lafferty





                                     -2-

<PAGE>
 
                                                                     EXHIBIT 34 
                                                                     ----------

                      IN THE UNITED STATES DISTRICT COURT

                         FOR THE DISTRICT OF DELAWARE


MENTOR GRAPHICS CORPORATION,    )
and MGZ CORP.,                  )
                                )
     Plaintiffs,                )
                                )
     v.                         )       Civil Action No. 98-473-RRM
                                )
QUICKTURN DESIGN SYSTEMS, INC., )
                                )
     Defendant.                 )
________________________________)
QUICKTURN DESIGN SYSTEMS, INC., )
                                )
     Counterclaimant,           )
                                )
     v.                         )
                                )
MENTOR GRAPHICS CORPORATION,    )
MGZ CORP., WALDEN C. RHINES,    )
GREGORY K. HINCKLEY, DEAN M.    )
FREED, GIDEON ARGOV, SCOTT H.   )
BICE, HARRY L. DEMOREST,        )
C. SCOTT GIBSON and MICHAEL J.K.)
SAVAGE,                         )
                                )
     Counterdefendants.         )


                 SECOND AMENDED AND SUPPLEMENTAL COUNTERCLAIMS
                 ---------------------------------------------

     Pursuant to Rule 13(a) of the Federal Rules of Civil Procedure, and without
waiving any defenses set forth in its Answers and Defenses, Quickturn Design
Systems, Inc. ("Quickturn"), hereby makes and files the following Counterclaims
against counterdefendants Mentor Graphics, MGZ (collectively, "Mentor") and the
Nominee Defendants (as defined below).

        1.  Quickturn makes these allegations upon knowledge as to its own acts,
and as to all other matters makes these allegations on information and belief
and investigation of
<PAGE>
 
counsel, including a review of documents filed with the Securities and Exchange
Commission, papers and proceedings filed with courts of various jurisdictions,
as well as articles and information available through the media.

                            JURISDICTION AND VENUE
                            ----------------------

        2.  This Court has jurisdiction over these Counterclaims under the
principle of ancillary jurisdiction because the claims herein arise out of the
same transaction or occurrence as the claims in Mentor's complaint. 28 U.S.C.
Section 1367(a). Jurisdiction also exists under Section 27 of the Securities
Exchange Act of 1934 as amended, 15 U.S.C. Section 78aa ("Exchange Act"), 28
U.S.C. Sections 1331 and 1337. The Counterclaims asserted herein arise under
Section 14 of the 1934 Act, 15 U.S.C. Sections 78n and the rules and regulations
promulgated thereunder.

        3.  Venue for these Counterclaims is proper in the United States
District Court for the District of Delaware, pursuant to 28 U.S.C. Section 1391
and principles of ancillary venue.

                                  THE PARTIES
                                  -----------

        4.  Quickturn is a Delaware corporation, which designs, manufactures,
markets and supports products which verify the design of integrated circuits and
electronic systems. Quickturn has established a position as the leading provider
of emulation technology and a leader in cycle-based simulation, for the
integrated circuit design verification market, as well as a reputation in the
industry as a technological leader and innovator in this area. Quickturn's
proven technical expertise, reputation for high-quality worldwide customer
service and support, and acknowledged quality manufacturing infrastructure have
all made the company a leader in its field.

                                      -2-
<PAGE>
 
        5.  Mentor Graphics is an Oregon corporation which manufactures, markets
and supports software and hardware Electronic Design Automation ("EDA") products
and provides related services which enable engineers to design, analyze,
simulate, model, implement and verify the components of electronic systems.
Mentor markets its products primarily to large companies in the communications,
computer, semiconductor, consumer electronics, aerospace and transportation
industries.

        6.  Walden C. Rhines, Gregory K. Hinckley and Dean M. Freed are
executive officers of Mentor who have participated in Mentor's solicitation of
agent designations and of proxies, including the wrongful acts alleged herein.

        7.  Gideon Argov, Scott H. Bice, Harry L. Demorest, C. Scott Gibson and
Michael J.K. Savage (the "Nominee Defendants") are each persons whom Mentor has
nominated to serve as its designees on the Board of Directors of Quickturn. Each
of the Nominee Defendants has participated in Mentor's solicitation of proxies,
including the wrongful acts alleged herein.

                                 INTRODUCTION
                                 ------------

        8.  This is an action arising out of Mentor's false and misleading
disclosures regarding its Tender Offer, filed on August 12, 1996 (the "Tender
Offer") and related agency designation and proxy solicitation (collectively the
"Proxy Solicitation"). As more fully described below, Mentor has engaged in a
pattern and practice of not disclosing, or of falsely disclosing, information
which is critical and material to Quickturn's stockholders as these stockholders
consider the Tender Offer and Proxy Solicitation.

        9.  The information Mentor falsely discloses or entirely omits from its
disclosures goes to the core of Mentor's Tender Offer and Proxy Solicitation,
including the 

                                      -3-
<PAGE>
 
value of Quickturn and what will happen to Quickturn's shareholders if Mentor is
successful in its proxy contest. The information not disclosed by Mentor, or
                                                 ---
disclosed in a false and misleading manner, includes the following:

          a.   MENTOR'S PROPOSED FINANCING FOR THE OFFER IS CONDITIONAL AND WILL
               EXPIRE BEFORE THE OFFER CAN BE CONSUMMATED.
               -----------------------------------------------------------------

     Mentor does not have sufficient cash on hand to finance its offer.  As a
result, it is borrowing $200 million to buy Quickturn.  While Mentor has claimed
that its offer does not contain a financing condition, in fact the financing for
Mentor's offer is highly conditional and dubious.  In particular, Mentor fails
to disclose that the loan commitment it has obtained will expire before it can
complete any acquisition of Quickturn.  As a result, Mentor may not be able to
complete the "second-step" of its proposed acquisition, thereby possibly leaving
those Quickturn shareholders who do not tender into Mentor's offer as minority
stockholders in a company controlled by Mentor.

          b.   MENTOR FAILS TO DISCLOSE HOW THE NOMINEE DEFENDANTS WOULD RUN
               QUICKTURN IF MENTOR IS SUCCESSFUL IN ITS PROXY CONTEST.
               -----------------------------------------------------------------

     Mentor is seeking to remove the entire Quickturn board, and replace it with
the Nominee Defendants selected by Mentor.  The Nominee Defendants have no
knowledge of Quickturn or its business, and have no experience or knowledge of
the emulation industry.  Yet Mentor fails to disclose how the Nominee Defendants
intend to operate Quickturn's business, and in particular what they will do if
Quickturn's management leaves as a result of the removal of Quickturn's board.
The result could be a disaster for Quickturn's shareholders:  a board, hand-
picked by Mentor, with no knowledge of the industry, Quickturn, its products or
even the multiple litigations between Quickturn and Mentor.  

                                      -4-
<PAGE>
 
Mentor thus fails to disclose the risk that Quickturn's business could be
substantially damaged -- and thus the value of Quickturn could decline
dramatically -- if Mentor's nominees are elected.

          c.   MENTOR FALSELY CLAIMS THAT ITS SENIOR MANAGEMENT BELIEVES A
               MENTOR ACQUISITION OF QUICKTURN WOULD BENEFIT THE CUSTOMERS OF
               QUICKTURN AND MENTOR.
               -----------------------------------------------------------------

     Mentor has repeatedly asserted, in its press releases and in its "road
show" presentations, that a merger of Mentor and Quickturn would benefit the
combined company's customers.  These statements are false.  In fact, members of
Mentor's senior management team have stated that a merger would be bad for
customers.  Mentor recognizes internally -- but fails to disclose publicly --
that the reason for the merger proposal is to eliminate the litigation between
Quickturn and Mentor, at the expense of harming Quickturn's customers and the
industry.

          d.   MENTOR FALSELY CLAIMS THAT ITS OFFER IS "NON-COERCIVE" WHEN IT IS
               COERCIVE AND CONDITIONAL.
               -----------------------------------------------------------------

     Mentor has repeatedly claimed, in press releases, meetings with Quickturn
stockholders and/or with the financial community, and in its public filings,
that its offer is "non-coercive".  This is not true.  In fact, Mentor's offer is
highly coercive.  This is because a condition to Mentor's offer is that it
acquire only a majority of Quickturn's stock.  As a result, if this (and the
other) Mentor conditions are satisfied, Mentor will be the majority stockholder
of Quickturn, but may not have sufficient financing to complete the "back-end"
of the transaction.  As a result, those Quickturn shareholders not tendering
into the "front-end" of Mentor's offer may be stuck as minority shareholders, in
a Quickturn which is majority owned by Mentor, and run by a board of directors
picked by Mentor but with no 

                                      -5-
<PAGE>
 
knowledge of Quickturn or its business. Quickturn shareholders are being coerced
to tender into Mentor's offer rather than risk this result.

          e.   MENTOR FAILS TO DISCLOSE THE HARM IT IS SUFFERING IN ITS BUSINESS
               AS A RESULT OF THE MULTIPLE FINDINGS THAT IT IS VIOLATING
               QUICKTURN'S INTELLECTUAL PROPERTY.
               -----------------------------------------------------------------

     On information and belief, a primary reason Mentor is seeking to acquire
Quickturn is to obtain Quickturn's intellectual property.  Multiple rulings by
every court that has faced the question have resulted in Mentor being completely
                                                                      ----------
prohibited from selling its SimExpress product line in the United States.  This
- ----------                                                                     
has resulted in a devastating -- and undisclosed -- blow to Mentor.  Mentor has
not disclosed to Quickturn shareholders, as they are trying to consider whether
Mentor's offer is adequate, how desperate Mentor is as a result of these
rulings, and what position Mentor will be in if its bid for Quickturn fails.
Such information is crucial to a Quickturn stockholder when considering the
adequacy of Mentor's offer.

          f.   MENTOR FAILS TO DISCLOSE ITS NOMINEES FOR THE QUICKTURN BOARD OF
                      -----                                            
               DIRECTORS.
               -----------------------------------------------------------------

     Mentor's offer is conditioned upon Mentor obtaining control of Quickturn's
board, and Mentor's Proxy solicitation is a two-step process to accomplish this
objective.  Specifically, Mentor proposes to (i) remove all eight of Quickturn's
current directors, (ii) reduce the size of Quickturn's board to five persons,
and (iii) place five new directors on Quickturn's board.  Yet Mentor's proposed
nominees were not identified anywhere in Mentor's hundreds of pages of required
filings in connection with the Tender Offer and Proxy Solicitation.  Rather, the
only information provided about these "stealth nominees" at the time of Mentor's
offer was that each (i) allegedly is "not affiliated with Mentor;" and, (ii)
despite the alleged independence of these directors, Mentor will pay each
nominee, just for 

                                      -6-
<PAGE>
 
being a nominee, more than twice as much as what Quickturn pays board members to
serve as directors. Mentor's failure to identify its nominees in a timely
manner, to explain the basis of its representation that each will be
independent, to explain why each director needs to be paid twice as much as
Quickturn's current directors just to stand for election, deprives Quickturn
shareholders of the most basic information necessary to have available before
they can consider Mentor's Proxy Solicitation.

          g.   MENTOR FALSELY CLAIMS THAT IT WAS WILLING TO NEGOTIATE A
               TRANSACTION.
               -----------------------------------------------------------------

     Mentor's statements in its Tender Offer and Proxy Solicitation are
affirmatively false in their assertions that Mentor was and is willing to
negotiate the proposed acquisition, when Mentor in fact had no intention of
doing so.  Mentor has from the beginning planned to proceed with its Tender
Offer solely on its own terms, rather than through discussions to obtain a fair
price for Quickturn shareholders.  For example, Mentor's August 11, 1998 letter
to Quickturn was not an attempt to negotiate, but a sham -- Mentor gave
Quickturn no opportunity to even consider the offer before it launched its
hostile takeover attempt.

        10.  These are just a few examples of the many false or misleading
statements and/or omissions contained in Mentor's Tender Offer and Proxy
Solicitation materials. The timing of Mentor's offer (on the heels of the
Federal Circuit ruling), the inadequate price, and the sheer number and extent
of Mentor's misrepresentations and omissions, demonstrate Mentor's intent to
mislead Quickturn's shareholders and to obtain Quickturn's intellectual property
at a bargain-basement price.

        11.  In fact, as detailed below, Mentor's offer is premised on its
violation of the federal securities laws, just as sales of Mentor's SimExpress
products are based on the violation of Quickturn's intellectual property rights.
Mentor's efforts to deceive Quickturn's 

                                      -7-
<PAGE>
 
shareholders are no more permissible or appropriate than its attempt to
misappropriate Quickturn's intellectual property. Accordingly, and as described
more fully below, Quickturn seeks to enjoin Mentor's Tender Offer and Proxy
Solicitation at least until such time as Mentor complies with its disclosure
obligations under the federal securities laws, and after Quickturn's
shareholders have the opportunity to consider the true nature of Mentor's offer
and assess Quickturn's value.

                         BACKGROUND TO MENTOR'S OFFER
                         ----------------------------

A.      MENTOR'S UNSUCCESSFUL EFFORTS TO STEAL QUICKTURN'S INTELLECTUAL PROPERTY
        ------------------------------------------------------------------------

        12.  In January 1996, Quickturn filed a complaint with the International
Trade Commission ("ITC") in Washington, DC, seeking to stop the unfair
importation of logic emulation systems manufactured by Meta Systems ("Meta"), a
French subsidiary of Mentor Graphics. In the complaint, Quickturn alleges that
Mentor's hardware logic emulation systems infringe Quickturn's patents.
Quickturn sought and received in August 1996, temporary relief from the ITC in
the form of Temporary Exclusion and Temporary Cease and Desist Orders. The
Federal Circuit Court of Appeals affirmed the ITC's issuance of temporary relief
in August 1997. In December 1997, the ITC issued: (1) a Permanent Limited
Exclusion Order which permanently prohibits the importation of hardware logic
emulation system, subassemblies or components manufactured by Mentor Graphics
and/or Meta, and (2) a Permanent Cease and Desist Order permanently prohibiting
Mentor from, among other things, selling, offering for sale or advertising the
same hardware logic emulation devices, Mentor's SimExpress products. The ITC's
two orders remain in effect until April 28, 2009, the latest expiration date of
the Company's patents involved in the investigation.

                                      -8-
<PAGE>
 
        13.  Quickturn is also engaged in a federal district court case with
Mentor and Meta involving six of Quickturn's patents. Mentor and Meta are
seeking a declaratory judgment of noninfringement, invalidity and
unenforceability of the patents in dispute, and Quickturn has filed
counteractions against Mentor and Meta for infringement and threatened
infringement of the six patents. On August 1, 1997, the U.S. District Court in
Oregon granted Quickturn's motion for a preliminary injunction against Mentor
Graphics, prohibiting its domestic emulation activities, namely, its SimExpress
products.

        14.  The Federal Circuit Court of Appeals affirmed the Oregon District
Court's decision on August 5, 1998. The Oregon action is presently set for trial
in December 1998.

        15.  In August 1997, a preliminary injunction sought by Mentor's German
subsidiary, Mentor Graphics (Deutschland) GmbH, was issued by a regional court
in Munich, enjoining agents of Quickturn from making certain statements
concerning U.S. litigation matters between the companies.  In May 1998, the
Munich district court set aside the preliminary injunction based on the failure
of Mentor's German subsidiary to advance its case within the six-month statutory
limitation.

        16.  In October 1997, Quickturn filed a complaint alleging infringement
of the German part of the Company's European Patent No. 0 437 491 B1 against
Mentor Graphics (Deutschland) GmbH, in the District Court of Dusseldorf. The
main court hearing for this matter is set for March 1999.

        17.  As a result of these patent lawsuits, Mentor may face substantial
liability to Quickturn, and in turn will be forced to pay Quickturn millions of
dollars in damages. Mentor also faces the potential loss of additional millions
as a result of its inability to sell its SimExpress product line in the United
States. Only Mentor knows the actual amounts it 

                                      -9-
<PAGE>
 
believes (i) it will owe Quickturn in damages and (ii) the amount of lost
profits it will lose as a result of its inability to sell SimExpress products in
the United States. Yet nowhere in either its Tender Offer materials or Proxy
Solicitation does Mentor disclose either amount or indeed any analyses relating
to these issues, despite the fact that such information is clearly material to
Quickturn shareholders as they consider Mentor's offer and Proxy Solicitation.

B.      MENTOR'S LATEST EFFORT TO STEAL QUICKTURN'S INTELLECTUAL PROPERTY -- THE
        TENDER OFFER
        ------------------------------------------------------------------------

        18.  As summarized above, Mentor has repeatedly sought to steal
Quickturn's intellectual property. Mentor's proposed takeover of Quickturn is
yet another such attempt.

        19.  On August 5, 1998, the Court of Appeals for the Federal Circuit
affirmed the Oregon District Court's Order enjoining the sales of SimExpress in
the United States. Less than a week later, Mentor's latest plan to acquire
Quickturn's intellectual property without properly compensating Quickturn and
its shareholders went into action.

        20.  On the evening of August 11, 1998, Quickturn's Chief Financial
Officer, Raymond Ostby received a call from a reporter with the Wall Street
Journal, who asked if Mr. Ostby would comment on a tender offer advertisement
that was scheduled to run in the next day's edition of the Wall Street Journal.
In the weeks and months prior to this call, Mentor had not stated any intention
to acquire Quickturn. In fact, Mentor's SEC filings indicate that the parties'
last discussion regarding a business combination was in 1995.

        21.  Later that evening, Walden C. Rhines, Mentor's President and Chief
Executive Officer, handed a letter to Glen Antle, Chairman of the Board of
Quickturn.  The letter offered to purchase all outstanding shares of Quickturn
for the inadequate price of $12.125 per share.

                                      -10-
<PAGE>
 
        22.  Rhines immediately demanded to know whether Quickturn would accept
the offer. Mr. Antle responded that he did not have authority to do so, but
would communicate the offer to Quickturn's Board of Directors. Rhines refused to
allow any time to consider or review Mentor's proposal, or even to present it to
Quickturn's board, although Rhines knew that Mr. Antle could not make an
uninformed or hasty decision about Mentor's proposal. Rhines informed Mr. Antle
that Mentor had already determined to proceed with its hostile tender offer.

        23.  Because Mentor knew that its offer was not in the best interests of
Quickturn's shareholders and suspected that Quickturn's board would reject the
inadequate offer, Mentor filed two lawsuits on August 12, 1998, designed at
least in part to force a hasty and uninformed decision by Quickturn's
shareholders.  One of those lawsuits is the above-captioned lawsuit pending in
this court.  The other is a complaint for declaratory and injunctive relief
filed in the Court of Chancery of the State of Delaware.

        24.  On that same day, August 12, Mentor publicly announced its cash
tender offer for all shares of Quickturn, and filed with the SEC a preliminary
proxy statement which, among other things, sought the solicitation of agent
designations for the purpose of calling a special meeting of Quickturn's
shareholders. Mentor filed its definitive Schedule 14A proxy solicitation on
August 20, 1998. The Proxy Solicitation and related Tender Offer filings are the
subject of Quickturn's counterclaims.

        25.  On August 21, 1998, Quickturn's Board of Directors met and
considered Mentor's tender offer. The Board of Directors voted to reject
Mentor's inadequate offer. Quickturn now brings these Counterclaims.

                                      -11-
<PAGE>
 
                              FIRST COUNTERCLAIM
                              ------------------
               (VIOLATION OF SECTION 14(a) OF THE EXCHANGE ACT, 
                   15 U.S.C. Section 78N(a) AND RULE 14a-9)
                                        
        26.  Quickturn realleges and incorporates herein by reference the
allegations of the Counterclaims contained in paragraphs 1 through 27 above,
inclusive, which are made on information and belief.

        27.  Quickturn is informed and believes, and on that basis alleges, that
Mentor knowingly, willfully, and intentionally engaged in a continuing scheme
and plan to defraud Quickturn and its shareholders. Mentor conducted this scheme
and plan through the use of the mails and instrumentalities of interstate
commerce in connection with Mentor's hostile Tender Offer and Proxy
Solicitation. In connection with Mentor's Proxy Solicitation, Mentor has made
false or misleading statements and/or failed to disclose material facts required
by the securities laws of the United States, and the rules promulgated
thereunder, rendering those statements misleading.

        28.  In connection with Mentor's hostile Tender Offer and Proxy
Solicitation, Mentor filed with the SEC a proxy statement pursuant to Section
14(a) of the Exchange Act for transmittal to Quickturn's shareholders. The law
requires Mentor's statement to contain certain specific, detailed information
which Mentor has misstated or omitted.

        29.  In fact, Mentor admits in its proxy statement that it has failed to
furnish sufficient disclosures to Quickturn's shareholders, and explicitly
promises that Mentor will forward additional materials which "WILL CONTAIN
SIGNIFICANTLY MORE DETAILED INFORMATION CONCERNING THE PROPOSALS AND THE
PROPOSED ACQUISITION, INCLUDING RELEVANT PRO FORMA FINANCIAL INFORMATION."

                                      -12-
<PAGE>
 
        30.  Section 14(a) of the Exchange Act and Rule 14a-9 impose liability
for false and misleading statements and omissions in proxy solicitations. Mentor
has knowingly or recklessly violated these provisions in order to prevent
Quickturn's shareholders from discovering that Mentor's offering price is
inadequate, and to keep the shareholders from making a fully informed decision
about Mentor's offer.

        31.  For example, Mentor's Proxy Solicitation fails to disclose the harm
to its business as a result of the various ongoing lawsuits between Mentor and
Quickturn. Instead, Mentor misleadingly tries to downplay the extent of Mentor's
exposure, implying that Quickturn's damages would be limited to some small
multiple of $3.5 million. However, completely missing from Mentor's disclosures
are any description of Mentor's loss of business resulting from the prohibition
of U.S. sales of its SimExpress products. Mentor's failure to disclose this
material information prevents Quickturn shareholders from understanding the
value of Quickturn, either as an independent company or as an acquisition target
for Mentor. Until this information is disclosed, Quickturn shareholders cannot
meaningfully evaluate Mentor's proxy solicitation. Mentor's failure to disclose
the required information renders the Proxy Solicitation false and misleading and
violates Rule 14a-9.

        32.  Mentor's failure to identify its proposed Nominees for the
Quickturn Board of Directors also renders the Proxy Solicitation false and
misleading. While Mentor states that a purpose of calling the special meeting is
for Mentor "to propose the election as directors of the Company of five
Nominees," to replace Quickturn's current board, Mentor fails to name those
Nominees. This omission violates the requirements of SEC Schedule 14A, which
requires a proxy statement to provide specific information, including the
identity of nominees, "[i]f action is to be taken with respect to the election
of 

                                      -13-
<PAGE>
 
directors[.]" Moreover, Mentor has failed to provide any of the required
                                                     ---
information whatsoever regarding its "Nominees." Quickturn's shareholders have
no way to decide for themselves whether Mentor's Nominees would truly be
independent, qualified individuals who would observe their fiduciary duties to
Quickturn and its stockholders, or mere puppets under Mentor's domination and
control. Without this material information, Quickturn and its shareholders
cannot make an informed decision regarding Mentor's solicitation of designations
for a special meeting and vote.

        33.  Mentor also fails to disclose the impact on Quickturn's
stockholders if Mentor is successful in its proxy contest. Specifically, the
Nominee Defendants selected by Mentor have no knowledge of Quickturn, its
business or its value. These nominees are not capable of running Quickturn,
particularly if Quickturn's existing management does not stay with the company.
Yet, if Mentor's plan is successful, by the end of October 1998 the Nominee
Defendants will be in control of Quickturn. What plans do the Nominee Defendants
have to ensure that Quickturn continues to operate successfully? What happens to
Quickturn stockholders if the Nominee Defendants obtain control of Quickturn's
board, and Mentor drops its offer? How do the Nominee Defendants intend to
operate Quickturn?

        34.  All of these questions are highly material to Quickturn's
shareholders as they consider whether to replace Quickturn's board with the
Nominee Defendants. Yet none of these questions are addressed by Mentor in its
solicitation materials.

        35.  Mentor's proxy statement is also false and misleading with respect
to Mentor's proposed financing for the offer. Mentor, a company with reported
revenues of only $454.7 million during its last fiscal year, has indicated that
it plans to use a $200 

                                      -14-
<PAGE>
 
million unsecured revolving credit facility to finance its proposed "all-cash"
$261 million acquisition of Quickturn. However, the Proxy Solicitation is
misleading as to this financing:

          a.  The Proxy Solicitation states that:

          While an adverse judgment in this [Quickturn patent] litigation would
          not affect Mentor Graphics' ability to borrow funds under the $200
          million unsecured revolving credit facility obtained in connection
          with the Offer, an adverse judgment could have a material adverse
          effect on Mentor Graphics' results of operations in the applicable
          period.

This statement simply is not true, given the conditions, covenants, and
representations of the credit facility, which appear to exclude costs of ongoing
litigation, but not adverse judgments or injunctions.  Moreover, this blanket
assertion is misleading on its face.  It is unlikely that a bank would permit
Mentor to draw against the credit facility if Mentor is required to pay damages
significant enough to have a "material adverse effect" on its business -- which
Mentor admits is a possibility.  And despite its misleading attempt to downplay
its exposure, Mentor has no guarantee regarding the size of adverse judgment(s)
it might suffer in litigation with Quickturn.

          b.  Mentor's statement in its Proxy Solicitation that "[t]he Offer is
not conditioned on Purchaser obtaining financing" is also misleading, as Mentor
does not have the cash on hand to finance the proposed acquisition, and cannot
complete it without either meeting the conditions precedent to draw on the
credit facility or obtaining other financing.

          c.  The proxy statement also fails to disclose when this loan
commitment is due to expire.  In particular, Mentor's loan commitment is due to
expire before Mentor can complete any acquisition of Quickturn.  As a result,
assuming the "success" of Mentor's offer, Quickturn shareholders not tendering
into the "front end" of Mentor's offer are likely to be stuck as minority
stockholders in a company (i) controlled by Mentor and (ii) run by a 

                                      -15-
<PAGE>
 
board of directors who know nothing about Quickturn or its business. Based upon
the foregoing, Mentor's repeated public assertion that its offer is "not
coercive" is false; in fact, Quickturn shareholders are being coerced to tender
into Mentor's offer, or risk being minority shareholders in a company led by a
board incapable of running the company.

        36.  The Proxy Solicitation's misleading statements and omissions about
Mentor's proposed financing are material, because they prevent Quickturn's
investors from making an informed decision about the adequacy of the offer. For
example, a reasonable investor would want to take into account that if Mentor
were to lose its ability to draw funds from the credit facility, it might not be
able to complete the "second step" of its offer, thus impairing the position of
Quickturn's non-tendering shareholders.

        37.  Other material omissions and misleading statements in Mentor's
proxy solicitation include, but are not limited to, the following:

             a.  Mentor's misrepresentations regarding its willingness to
negotiate a fair price for Quickturn shares. Contrary to statements in the Proxy
Solicitation, Mentor has pursued a hostile takeover route by refusing to allow
Quickturn's board to consider the offer before moving forward.

             b.  Mentor's misleading statement that the Quickturn board of
directors should be reduced in size from eight members to five because a
"smaller number of directors would be a more effective working group."   Mentor
does not explain how five directors are a more effective working group than
eight.   Mentor's unexplained choice of five directors is seemingly arbitrary:
if Mentor truly thinks that five directors is the proper number, why does the
Mentor board have six members?  Quickturn is informed and believes and on that
basis 

                                      -16-
<PAGE>
 
alleges that Mentor desires a smaller number of directors in order to facilitate
Mentor's control over the proposed board, to the detriment of Quickturn's other
shareholders.

             c.  Mentor's claim that forcing a combination of Quickturn and
Mentor would be good for Quickturn's customers is false. In fact, on information
and belief, senior executives within Mentor have privately claimed that if
Mentor's hostile effort is successful, the loser will be the customers of both
companies.

        38.  On September 11, 1998, Mentor issued a press release stating that
it "has called a Special Meeting of the stockholders [of Quickturn] for October
29, 1998 . . . . The record date for Quickturn stockholders to be able to vote
at the Special Meeting is September 10, 1998."

        39.  The statements made in the press release described in paragraph 38
were blatantly false and misleading, and were deliberately intended to mislead
Quickturn's stockholders.

        40.  In fact, as Mentor well knows, but deliberately did not disclose,
under Quickturn's Bylaws, the Special Meeting of stockholders which it purported
to call could be held only at a time and date set by the directors of Quickturn,
which under the Bylaws would have to be between December 10, 1998 and December
20, 1998 (i.e., 90 to 100 days after holders purportedly requested such a
          ----
meeting). While Mentor's press release makes passing reference to Quickturn's
Bylaw, it makes no reference whatsoever upon the effect of the Bylaw on Mentor's
ability to call its Special Meeting for October 29 rather than the December 10
through 20, 1998 time period.

        41.  Similarly, Mentor's press release nowhere mentions that it has
filed suit in the Delaware Court of Chancery seeking to invalidate Quickturn's
Special Meeting Bylaw, and

                                      -17-
<PAGE>
 
that its ability to hold any stockholders meeting prior to December 10, 1998 is
wholly contingent upon its success in that lawsuit. Nor does Mentor mention the
material fact that the Court has reserved October 7, 1998 as a date to hear a
motion by Quickturn for summary judgment in Mentor's Delaware Court of Chancery
action, and that the Court has scheduled trial in that action to be held during
the October 19 through 23 time period.

        42.  Finally, Mentor does not disclose that, even if it were to prevail
in its Court of Chancery litigation, it still would not be possible to hold a
meeting by the end of October, as the process for holding a meeting for a public
corporation listed on NASDAQ takes at least 40 days and thus, under the most
optimistic scenario for Mentor -- i.e., assuming an order on October 23
                                  ----                                 
enjoining Quickturn's Bylaw amendment, which order is not appealed -- Mentor
cannot hold the meeting before early December.

        43.  The foregoing material omissions and misstatements in the Proxy
Solicitation materials constitute an ongoing violation of Section 14(a) of the
Securities Exchange Act, 15 U.S.C. Section 78n, and the rules and regulations
promulgated to enforce that section.

        44.  Unless Mentor is preliminarily and permanently enjoined from
continuing to violate Section 14(a), and the regulations promulgated thereunder,
Quickturn's current and potential shareholders will be unlawfully deprived of
critical information affecting decisions related to Mentor's agent designation
solicitation. In addition, Quickturn will suffer immense, irreparable injury in
the absence of injunctive relief in that, among other things, Quickturn and its
board of directors will be forced to expend scarce time and substantial
financial resources responding to Mentor's demand for a special shareholders'
meeting, demand for access to Quickturn shareholder information and its attempt
to remove Quickturn's board. Further, Mentor's continued dissemination of
materially misleading 

                                      -18-
<PAGE>
 
statements about Quickturn will cause irreparable harm to Quickturn's
relationships with its employees, customers and vendors by causing uncertainty
as to the financial stability and future economic viability of Quickturn.

        45.  The injunctive relief requested would serve the public interest. It
will benefit Quickturn's public shareholders and the market as a whole by
requiring Mentor to conform its conduct to comply with federal securities laws,
rules, and regulations, and prevent Mentor from disseminating false and
misleading information to shareholders and the public.

                              SECOND COUNTERCLAIM
                              -------------------
         (VIOLATION OF SECTION 14(d) OF THE SECURITIES EXCHANGE ACT, 
                           15 U.S.C. SECTION 78n(d))

        46.  Quickturn realleges and incorporates here by this reference each
and every allegation of the Counterclaims contained in Paragraphs 1 through 45,
inclusive, which are made on information and belief.

        47.  August 12, 1998, Mentor filed with the SEC a Schedule 14D-1
relating to the Quickturn tender offer, which incorporated by reference, among
other things, Mentor's Offer to Purchase. The Schedule 14D-1 and the Offer to
Purchase were amended and supplemented by Mentor on August 20, 1998. The
Schedule 14D-1 and the Offer to Purchase, as well as their amendments and
supplements, are materially deficient in violation of Section 14(d) of the
Exchange Act and the rules and regulations thereunder, by their failure to
adequately disclose information required by those provisions.

        48.  Mentor's response to Item 5(a) of the Schedule 14D-1 (including the
Introduction and Sections 11 and 13 of the Offer to Purchase to which its Item
5(a) response refers) fails to disclose adequately Mentor's attempt to
circumvent court orders prohibiting Mentor's U.S. sales of SimExpress products.
Instead, Mentor incorporates misleading 

                                      -19-
<PAGE>
 
statements implying that its only concern is the ongoing costs associated with
conducting the intellectual property litigation between Mentor and Quickturn.

        49.  As explained above, Mentor's repeated losses in the intellectual
property litigation have crippled Mentor's ability to compete in emulation
technology in the United States. On information and belief, Mentor decided to
seek to acquire Quickturn only after Mentor lost its appeal of the Oregon
District Court's preliminary finding of likely infringement upon Quickturn's
patents. On information and belief, Mentor's analyses showed that an acquisition
of Quickturn would allow Mentor to re-enter the U.S. emulation market, and thus
Quickturn is worth a high price to Mentor -- certainly higher than the current
offer. Mentor's response to Item 5(a) violates Section 14(d) and the rules and
regulations thereunder because it omits these important, material facts that
Quickturn shareholders should consider in making a decision regarding the Tender
Offer.

        50.  Mentor's response to Item 10(b)-(c) of the Schedule 14D-1
(including Section 15 of the Offer to Purchase to which its Item 10(b)-(c)
response refers) is rendered false and misleading by its statement that Mentor
will not delay its purchase of shares tendered by Quickturn stockholders in
connection with the Offer pending the outcome of any action by a governmental
authority. Mentor's statement creates a dangerous false sense of security that
its offer will not be coercive.

             a.  Mentor purports to make a non-coercive Offer by stating its
intent to offer the same price in the second-step merger transaction as that
offered in the first-step tender offer. However, in Section 15 of the Offer to
Purchase, Mentor states it will go ahead with the first-step purchases even in
the absence of any governmental approval required for 

                                      -20-
<PAGE>
 
the second-step merger. Taken together, these two assertions render the Offer
materials false and misleading.

             b.  While on the one hand Mentor seeks to assure that non-tendering
stockholders will receive the same cash price in the second-step merger
transaction, on the other hand, Mentor intends to embark on the first-step
tender offer without certainty that its Proposed Merger will be permitted to
occur.   In fact, non-tendering stockholders may not have the opportunity to
dispose of their shares at the same cash price as that realized by tendering
stockholders in the Offer.  The misleading impression created by these
statements violates Section 14(d) and the rules and regulations thereunder.

        51.  Mentor's response to Item 9 of Schedule 14D-1 (including Section 8
of the Offer to Purchase to which its Item 9 response refers) also fails to
disclose sufficient financial information concerning Mentor, in violation of
Section 14(d) and applicable rules and regulations. For example, Mentor's
financial disclosures do not include the following information required to be
disclosed to make the statements not misleading:

             a.  The cost to Mentor of not being able to sell an emulation
product in the U.S. market due to the current court rulings;

             b.  Mentor's costs, expenses, and its liabilities other than short-
term borrowings and long-term debt and deferrals.  This omitted financial
information would be material to Quickturn stockholders' tender decision,
especially given the highly leveraged nature of the proposed takeover ($200
million credit for a $261 million acquisition).

             c.  For the reasons set forth above, such a result would be a
disaster for Quickturn's stockholders. In particular, a Quickturn stockholder
needs to know, but is not told by Mentor or the Nominee Defendants, what happens
to Quickturn (i) after the Mentor
                 -----

                                      -21-
<PAGE>
 
Nominees are elected and (ii) before Mentor completes any offer for Quickturn.
                              ------
Further, how is Quickturn going to operate if Mentor cannot complete its
acquisition because of the financing contingency (or any other issue) when it
has a board that lacks the most fundamental knowledge about Quickturn, its
business, products and industry.

        52.  Mentor's response to Item 10(b)-(c) of the Schedule 14D-1
(including Section 15 of the Offer to Purchase to which its Item 10(b)-(c)
response refers) violates Section 14(d) and applicable rules and regulations in
that it fails to disclose sufficient information concerning the applicability of
foreign law to Mentor's Offer. Mentor states only that foreign law may apply to
the proposed acquisition, without any mention of specific foreign countries in
which Quickturn does business or any analysis as to what, if any, foreign laws
or requirements might apply to the Offer and/or to the Proposed Merger. This
information is clearly called for by the instructions to Item 10(b)-(c) of the
Schedule 14D-1.

        53.  As a result of the foregoing material omissions by Mentor in its
Schedule 14D-1, Quickturn's stockholders are deprived of information that they
are entitled to receive in connection with Mentor's Offer under Section 14(d) of
the Exchange Act and the rules and regulations promulgated thereunder. As the
securities laws recognize, the unlawfully omitted information would be important
to stockholders in making the decision whether or not to tender their shares to
Mentor. The injunctive relief sought by Quickturn is therefore necessary (1) to
prevent Mentor from the continued execution of its unlawful tender offer; (2) to
preserve the integrity of the market for Quickturn's stock; and (3) to protect
Quickturn and its stockholders from Mentor's attempt to acquire Quickturn in a
manner which is violates the federal securities laws.

                                      -22-
<PAGE>
 
                              THIRD COUNTERCLAIM
                              ------------------
         (VIOLATION OF SECTION 14(e) OF THE SECURITIES EXCHANGE ACT, 
                           15 U.S.C. SECTION 78n(e))

        54.  Quickturn realleges and incorporates here by this reference each
and every allegation of the Counterclaims, contained in Paragraphs 1 through 53,
inclusive, which are made on information and belief.

        55.  Quickturn is informed and believes, and on such basis alleges, that
Mentor knowingly and intentionally has engaged in a continuing plan and scheme
and conspiracy to defraud the investing public through the use of the mails and
other means and instrumentalities of interstate commerce in connection with its
Offer; has employed devices, schemes and artifices to defraud Quickturn and its
stockholders; and has omitted to state material facts necessary in order to make
the statements made, in light of the circumstances under which such statements
were made, not misleading. As detailed above, Mentor has failed to disclose,
and/or has inadequately disclosed, material information required to be disclosed
in the Schedule 14D-1 in connection with its Offer, as mandated by Section 14(d)
of the Exchange Act and the rules and regulations promulgated thereunder. These
material omissions were purposefully designed to mislead the investing public.
As such, Mentor has violated Section 14(e) of the Exchange Act and the rules and
regulations promulgated thereunder.

        56.  In addition to the material omissions detailed above, Mentor's
Schedule 14D-1 is false and misleading as follows:

             a.  Mentor's response to Item 10(e) of the Schedule 14D-1
(including the Introduction and Sections 10 and 17 of the Offer to Purchase to
which its Item 10(e) response refers) is rendered false and misleading by its
understatement of the value and 

                                      -23-
<PAGE>
 
benefits to Quickturn, as an independent company, of the patent litigation
currently pending between Mentor Graphics and Quickturn, as described above.

             b.  Mentor's response to Item 5(c) of the Schedule 14D-1 (including
the Introduction and Sections 11 and 13 of the Offer to Purchase to which its
Item 5(c) response refers) is false and misleading by its failure to disclose
sufficient information concerning its plans to change the size and composition
of the Quickturn board of directors.  As explained above, the omission of this
material information creates a misleading impression as to Mentor's purposes,
and prevents Quickturn's shareholders from making an informed decision regarding
the adequacy of the offer.

             c.  The stockholders have no way of determining whether Mentor's
proposed slate of directors would contain qualified individuals who would
observe their fiduciary duties to Quickturn and its stockholders and not be mere
puppets under Mentor's domination and control.

             d.  Mentor's response to Item 10(b)-(c) of the Schedule 14D-1
(including Section 15 of the Offer to Purchase to which its Item 10(b)-(c)
response refers) is rendered false and misleading by its statement that Mentor
will not delay its purchase of shares tendered by Quickturn stockholders in
connection with the Offer pending the outcome of any action by a governmental
authority.  As explained above, this creates the dangerous false impression that
Mentor's offer will not be coercive.

             e.  Mentor's Press Release dated August 12, 1998 (attached to the
Schedule 14D-1 as Exhibit (a)(7)) is misleading as to Mentor's financing for the
proposed acquisition, because it states that the Offer is "not subject to any
financing condition," when in fact Mentor's $200 million revolving credit
facility is subject to numerous financing 

                                      -24-
<PAGE>
 
covenants, conditions and representations to which Mentor's financing for its
Offer is subject.

             f.  Mentor's Introduction to the Offer to Purchase falsely implies
that Mentor attempted to negotiate the Offer with Quickturn, and Quickturn
immediately rejected the offer, even before Quickturn's board had considered the
proposal.

        57.  As a result of the foregoing material false and misleading
statements and omissions by Mentor in its Schedule 14D-1, Mentor's Offer
materials are unlawful under Section 14(e) of the Exchange Act and the rules and
regulations promulgated thereunder. As the securities laws recognize, the
unlawfully false and misleading and omitted information would be important to
stockholders in making the decision whether or not to tender their shares to
Mentor. The injunctive relief sought by Quickturn, is therefore necessary: (1)
to prevent Mentor from the continued execution of its unlawful tender offer; (2)
to preserve the integrity of the market for Quickturn's stock; and (3) to
protect Quickturn and its stockholders from Mentor's attempt to acquire
Quickturn in a manner which is violates the federal securities laws.

                               PRAYER FOR RELIEF
                               -----------------
     WHEREFORE, Quickturn prays for relief as follows:

     A. A temporary restraining order and a preliminary and permanent
injunction that:

        1.  Requires Mentor to correct its filings under the Exchange Act to
conform to all applicable requirements of the law;

        2.  Bars Mentor and its officers, agents, servants, employees, and
attorneys, and those persons and entities in active concert of participation
with it, including 

                                      -25-
<PAGE>
 
without limitation, the Nominee Defendants, from violating Sections 14(a), 14(d)
or 14(e) of the Exchange Act and the rules and regulations promulgated
thereunder, including by making or disseminating any further public statements
relating to its proposed special shareholders' meeting, Proxy Solicitation or
Tender Offer, or any of the other matters mentioned in its Sections 14(a) and
14(d) filings or public statements related thereto, and from purchasing any
additional shares of Quickturn common stock and from voting any Quickturn stock
that it purports to own currently until at least thirty (30) days after Mentor
makes the required corrective disclosures;

        3.  Forbids Mentor and its officers, agents, servants, employees, and
attorneys, and those persons and entities in active concert of participation
with it, including without limitation, the Nominee Defendants, from soliciting
any agency designations or proxies related to Quickturn, and voids any agency
designations or proxies thus far delivered to Mentor, until at least thirty (30)
days after Mentor makes the required corrective disclosures;

        4.  Enjoins Mentor and its officers, agents, servants, employees, and
attorneys, and those persons and entities in active concert of participation
with it, including without limitation, the Nominee Defendants, from proceeding
with the Offer, or acquiring or attempting to acquire any further Quickturn
stock, or taking or attempting to take any other steps to acquire control of
Quickturn, until at least thirty (30) days after Mentor has made the required
corrective disclosures;

        5.  Enjoins Mentor and its officers, agents, servants, employees, and
attorneys, and those persons and entities in active concert of participation
with it, including without limitation, the Nominee Defendants, from exercising
or attempting to exercise

                                      -26-
<PAGE>
 
influence or control over the business or management of Quickturn until at least
thirty (30) days after Mentor has made the required corrective disclosures; and

        6.  Enjoins Mentor and its officers, agents, servants, employees, and
attorneys, and those persons and entities in active concert of participation
with it, including without limitation, the Nominee Defendants, from making any
false or misleading statements regarding Quickturn or Quickturn shares;

     B. A declaration that Mentor's demands, as stated in its Proxy Solicitation
and Tender Offer materials, violate the federal securities laws and do not
comport with Quickturn's Bylaws and that Quickturn is not required to comply
with such demands;

     C. A declaration that Mentor's purported proxy solicitation of agency
designations is invalid and that any agency designations Mentor may receive as a
result of such solicitation are null and void;

     D. A declaration that Mentor's purported solicitation of proxies is invalid
and that any proxies Mentor may receive as a result of such solicitation are
null and void ;

     E. An award of Quickturn's costs and disbursements, including reasonable
attorneys' fees in this action; and

     F. Such other and further relief as the Court may deem just and proper.

                                      -27-
<PAGE>
 
                                MORRIS, NICHOLS, ARSHT & TUNNELL


                                 /s/ William M. Lafferty
                                _____________________________________
                                Kenneth J. Nachbar (#2067)
                                William M. Lafferty (#2755)
                                Donna L. Culver (#2983)
                                1201 N. Market Street
                                P.O. Box 1347
                                Wilmington, DE  19899
                                (302) 658-9200
                                   Attorneys for Counterclaimant
                                   Quickturn Design Systems, Inc.

OF COUNSEL:

James A. DiBoise
David J. Berger
Wilson Sonsini Goodrich & Rosati, PC
650 Page Mill Road
Palo Alto, CA  94304-1050
(650) 493-9300

September 21, 1998


88512

                                      -28-

<PAGE>
 
                         QUICKTURN DESIGN SYSTEM, INC.
 
                          THE QUICKTURN BUSINESS PLAN
 
Dear Quickturn Stockholder:
 
  Your Board's decision to reject Mentor's offer is based upon its strong
belief that Quickturn has a promising future. The Board has determined that
Quickturn's business plan offers the potential for obtaining higher long-term
benefits for you, the stockholders, than Mentor's offer. I would like to share
with you some of the details of this plan, as well as to describe some of the
benefits and risks we believe it entails. I also want to direct you to the
Quickturn 1997 Annual Report to Stockholders and Annual Report on Form 10-K
for the year ended December 31, 1997 for a more detailed discussion of the
plan and the associated risks, as well as other information about Quickturn in
general.
 
  The fundamentals of our business plan remain as they always have been--to be
the leader in high-performance design verification tools for the most complex
integrated circuits and electronics systems. The details of the plan to
achieve this goal have evolved over the years. At its core is our current
leadership position in emulation technology. Our recently announced Mercury
Design Verification System is intended to strengthen the position already
achieved by the Company's industry-standard System Realizer emulator.
Complementing Mercury and System Realizer is our CoBALT emulation system,
introduced in January 1997. CoBALT is the industry's most powerful cycle-based
emulation system. In all of our emulation activities, our goal has been to
increase the accessibility and use of emulation technology by the electronics
and semiconductor industries through continual decreases in customer design
cost per silicon gate and increases in ease of use.
 
  In recent years, we have included in our business plan efforts to stake out
leadership positions in other new complementary technologies. For example,
through our acquisition of Speedsim, Inc. in 1997, we acquired a strong
position in cycle-based simulation technology, an important verification
technology complementary to emulation. Our business plan also includes a
strategic open architecture initiative, promoting greater interoperability
among different vendors' design tools. An outcome of this initiative is our
Q/Bridge technology, which provides an interface between simulation-based
software tools and our hardware-based emulators making Quickturn's technology
available to a broader base of users worldwide.
 
  Given the complexity of the verification task, a key part of Quickturn's
business plan is to offer its mission-critical turnkey Time-to-Market
Engineering (TtME) support services to provide applications expertise, start-
up assistance, training, on-site integration, custom engineering development
and complete project implementation as needed by our customers to meet actual
verification challenges. Launched in 1996, TtME has been growing at more than
30% per year and Quickturn expects TtME to play a key role in our planned
growth.
 
  Another important aspect of our business plan is to establish and strengthen
strategic alliances with other participants in the EDA industry. The CoBALT
emulation system was developed as part of our exclusive technology
relationship with IBM, and the Q/Bridge technology has led to technology
partnerships with other leading companies in the EDA industry such as
Synopsys, Inc. and Cadence Design Systems, Inc. to tightly integrate their
industry-leading software simulation tools with Quickturn's emulation systems.
 
  This is our business plan. We believe it is the best for our markets, our
goals and, ultimately, you, our stockholders. Our execution of the plan has
been challenged over the past two years. In 1997, we faced aggressive
marketing campaigns from new competitors causing temporary delay and confusion
in the market. More recently, economic turmoil in the Asia/Pacific region has
affected our business as well as the businesses of many others in the
industry. Nonetheless, we believe that Quickturn will generate substantial
returns for Quickturn's stockholders over the next two years and thereafter.
Our confidence in the plan is based upon, among other things, the following
factors:
 
  . As the electronics industry makes the transition to deep submicron
    semiconductor processing, we believe the increasing complexity of chip
    design will generate higher demand for verification products;
<PAGE>
 
  . Quickturn has invested more than $60 million on research and development
    over the last three years, generating current and future planned products
    such as the MercuryTM Design Verification System, which is expected to be
    in full production by year-end;
 
  . Quickturn is committed to its long-standing policy of vigorously
    defending its strong intellectual property position, which includes 25
    issued U.S. patents, 25 pending U.S. patent applications, and numerous
    international patents and application filings;
 
  . Despite the current economic downturn in the Asia/Pacific region,
    Quickturn believes a reinvestment cycle in new design activity in that
    area is imminent, given the competitive forces in the worldwide
    electronics industry; and
 
  . Quickturn is beginning to see some signs of that reinvestment cycle
    commencing in the third quarter and particularly in the fourth quarter of
    this year.
 
  However, a number of the above factors, as well as the success of the plan
itself, are dependent upon risks, uncertainties and events not within
Quickturn's control, including the following: (i) the company is uncertain
whether the recent weakness experienced in the Asia/Pacific and domestic
market will continue in the foreseeable future; (ii) product transitions to
Quickturn's new Mercury Design Verification System may be disrupted due to
slow market acceptance or due to disruptions in manufacturing for component
availability; (iii) many of the company's customers order on an as-needed
basis and often delay delivery of firm purchase orders; (iv) many of the
company's products involve a lengthy sales cycle which could result, among
other things, in fluctuations of operating results and inventory obsolescence
if expected orders are delayed or not received; (v) the company expects
increased competition, which could result in lost sales or price erosion; (vi)
the company's patents and other proprietary rights may not ensure adequate
protection against competition; (vii) the company serves the electronics and
semiconductor industries, which are noted for rapidly changing needs, there
can be no assurance that Quickturn's product enhancements or new product
introductions will keep pace with or meet those rapidly changing needs or that
new products offered by others will not be superior to those offered by
Quickturn; and (viii) there can be no assurance that Quickturn can retain the
services of key employees and key suppliers upon which the company is
dependent to provide product advances, timely productions and high levels of
product quality and reliability.
 
  This is the business plan that has led us to our current leadership
position, and this is the business plan we intend to continue to follow. Don't
let Mentor prevent us from continuing to carry it out and delivering to you
the benefits we believe will result from it.
 
                                          Very truly yours,

                                          /s/ Keith Lobo
                                          --------------------
                                          Keith Lobo


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