SUNNYVALE, Calif.–(BUSINESS WIRE)–April 23, 2004–Monolithic
System Technology, Inc. (MoSys), (Nasdaq:MOSY) the industry’s leading
provider of high density SoC embedded memory solutions, today charged
Synopsys, Inc. (Nasdaq:SNPS) with breach of contract following the
abrupt termination of a merger agreement by Synopsys in April, 2004.

The complaint seeks to force Synopsys to complete the merger
agreement or otherwise seeks monetary damages arising from the breach
of the merger agreement.

“Synopsys waited until the last minute to pull out of a lawful
agreement, causing significant damage to our company and our
stockholders,” said Fu-Chieh Hsu, Chairman and CEO. “While we regret
our only alternative is litigation, we believe this merger is still
important for both companies and we are prepared to move forward to
close the transaction. We hope the management of Synopsys will
recognize not only its contractual obligations but also the benefits
it has repeatedly asserted about this merger.”

The lawsuit, filed in the Chancery Court of the State of Delaware,
describes a long and detailed process that began in October 2003 and
proceeded through various stages of due diligence leading to a signed
merger agreement on February 23, 2004. Synopsys issued a tender offer
for shares of MoSys on March 22, 2004, and by April 16, the date the
tender offer was scheduled to expire, 89 percent of the outstanding
shares were tendered, well over the 50 percent threshold required by
the agreement.

Instead of accepting the tendered shares Synopsys terminated the
agreement. Although the company said that if asked it would explain
the reasons it was entitled to terminate the agreement, Synopsys has
yet to provide that explanation.

“Following the announcement of the merger agreement the leadership
of Synopsys made numerous public statements about the benefits of the
merger and why it would benefit their shareholders,” Dr. Hsu stated.
“We were completely unaware of any issues that would constitute a
legitimate reason to breach our agreement as we had discussed all the
significant aspects of our business and operations that Synopsys had
inquired about.”

The lawsuit alleges that, in the absence of any explanation,
Synopsys may have engaged in obtaining confidential information to
gain an unfair and illegal advantage in competing with MoSys at some
future point when Synopsys enters the memory business.

The suit asks the court to enforce the merger agreement or,
alternatively, to award damages to compensate MoSys and its
stockholders for the harm caused by the decision of Synopsys to breach
the agreement.

About MoSys

Founded in 1991, MoSys (Nasdaq:MOSY), develops, licenses and
markets innovative memory technologies for semiconductors. MoSys’
patented 1T-SRAM technologies offer a combination of high density, low
power consumption, high speed and low cost unmatched by other
available memory technologies. The single transistor bit cell used in
1T-SRAM memory results in the technology achieving much higher density
than traditional four or six transistor SRAMs while using the same
standard logic manufacturing processes. 1T-SRAM technologies also
offer the familiar, refresh-free interface and high performance for
random address access cycles associated with traditional SRAMs. In
addition, these technologies can reduce operating power consumption by
a factor of four compared with traditional SRAM technology,
contributing to making them ideal for embedding large memories in
System on Chip (SoC) designs. MoSys’ licensees have shipped more than
50 million chips incorporating 1T-SRAM embedded memory technologies,
demonstrating excellent manufacturability in a wide range of silicon
processes and applications. MoSys is headquartered at 1020 Stewart
Drive, Sunnyvale, California 94085. More information is available on
MoSys’ website at

Forward-Looking Statements

This press release may contain forward-looking statements about
the Company including, without limitation, benefits and performance
expected from use of the Company’s 1T-SRAM technology.

Forward-looking statements are based on certain assumptions and
expectations of future events that are subject to risks and
uncertainties. Actual results and trends may differ materially from
historical results or those projected in any such forward-looking
statements depending on a variety of factors. These factors include
but are not limited to, customer acceptance of our 1T-SRAM
technologies, the timing and nature of customer requests for our
services under existing license agreements, the timing of customer
acceptance of our work under such agreements, the level of commercial
success of licensees’ products such as the Nintendo GAMECUBE and cell
phone hand sets, ease of manufacturing and yields of devices
incorporating our 1T-SRAM, our ability to enhance the 1T-SRAM
technology or develop new technologies, the level of intellectual
property protection provided by our patents, the vigor and growth of
markets served by our licensees and customers, the impact of the
Company’s acquisition of ATMOS Corporation on future operating results
and operations of the Company, the impact of the termination by
Synopsys of its agreement to acquire the Company, and other risks
identified in the Company’s most recent annual report on Form 10-K
filed with the Securities and Exchange Commission, as well as other
reports that MoSys files from time to time with the Securities and
Exchange Commission. MoSys undertakes no obligation to update publicly
any forward-looking statement for any reason, except as required by
law, even as new information becomes available or other events occur
in the future.

1T-SRAM(R) is a MoSys trademark registered in the U.S. Patent and
Trademark Office. All other trade, product, or service names
referenced in this release may be trademarks or registered trademarks
of their respective holders.

CONTACT: MoSys, Sunnyvale
Mark Voll, 408-731-1846
Litigation Inquiries
Michael Claes, 212-614-5236
Investor Inquiries
Shelton IR
Beverly Twing, 972-239-5119 x126

SOURCE: Monolithic System Technology, Inc.