EXHIBIT 99.1


Quickturn Board to Review Mentor Graphics'
Unsolicited Tender Offer

Advises Shareholders to Take No Action at Present Time

SAN JOSE, Calif.--(BUSINESS WIRE)--August 12, 1998--Quickturn Design Systems, 
Inc. (NASDAQ: QKTN - news) announced today, in response to Mentor Graphics 
Corporation's (NASDAQ: MENT - news) unsolicited tender offer for all 
outstanding shares of Quickturn, that the Company's board of directors will 
study the offer and make its recommendation to shareholders in due course. In 
the meantime, Quickturn urges all its shareholders to take no action with 
respect to the Mentor Graphics offer and any related activities until 
Quickturn's board of directors has made its recommendation.

Quickturn Design Systems, Inc. is the leading provider of verification 
products and time-to-market engineering (TtME(TM)) services for the design of 
complex ICs and electronic systems. The company's products are used worldwide 
by developers of high-performance computing, multimedia, graphics and 
communications systems. Quickturn is headquartered at 55 W. Trimble Road, San 
Jose, CA 95131-1013; Telephone: 408/914-6000. For more information, visit the 
Quickturn Web site at www.quickturn.com or send e-mail to info@quickturn.com.

Contact:

     Quickturn Design Systems, Inc.
     Raymond K. Ostby
     Vice President Finance & Administration, CFO
     (408) 914-6633
       or
     Abernathy MacGregor Frank
     Jim MacGregor/Matt Sherman
     (212) 371-5999