For Immediate Release

Lattice And Synplicity Ink Development And Marketing Agreement

- Synplify Pro synthesis performance enhancements for new Lattice FPGA devices scheduled for 2005 release -

HILLSBORO, OR and SUNNYVALE, CA - APRIL 18, 2005 - Lattice Semiconductor Corporation (NASDAQ: LSCC) and Synplicity Incorporated (NASDAQ: SYNP) today announced a comprehensive development and marketing agreement to enhance and promote Lattice FPGA device performance in Synplicity's Synplify Pro® FPGA synthesis tool during the second half of 2005. The agreement calls for significant enhancements, including register retiming, pipelining, and memory inferencing, to strengthen current support for Lattice FPGAs. The Synplify Pro software currently supports all Lattice digital programmable logic devices, including the new, non-volatile LatticeXP™ FPGAs.

“Continuous performance improvement is emphasized by Lattice and its partners,” said Chris Fanning, Lattice vice president of software. “We are confident that Synplicity will deliver considerably improved performance and support for Lattice FPGAs, and that our customers will benefit greatly from Lattice and Synplicity's expanded relationship.”

Joe Gianelli, Synplicity vice president of business development, said, “This agreement reflects our unqualified commitment to deliver unprecedented device performance for Lattice FPGA products in our Synplify Pro software. Performance is a hallmark of Synplicity's synthesis tools, and we are eager to continually expand and improve our support for Lattice FPGAs.”

Availability and pricing
Synplify Pro software, Lattice-only, Node-locked, supporting all Lattice digital programmable devices, is currently available from Synplicity starting at $20,000.

About the latest generation of Lattice FPGAs
The newest generation of Lattice FPGAs, LatticeXP devices employ a combination of SRAM and Flash technology to provide a non-volatile, in-system reconfigurable FPGA family that offers a single chip, secure solution for logic integration. The low cost, SRAM-based LatticeEC™ family provides the best DDR memory interface performance in its class, as well as economical SPI Flash memory configuration. The LatticeECP-DSP™ family adds a best-in-class multiplier-accumulator engine to the optimized architecture of the LatticeEC to support the expanding use of DSP functionality. Additional complementary device families are planned for announcement later this year.

About Synplicity
Synplicity® Inc. (NASDAQ: SYNP) is a leading supplier of innovative synthesis, verification and physical implementation software solutions that enable the rapid and effective design and verification of semiconductors. Synplicity's high-quality, high-performance tools significantly reduce costs and time-to-market for FPGA, structured/platform ASIC and cell-based/COT ASIC designers. The company's underlying Behavior Extracting Synthesis Technology® (BEST™), which is embedded in its logical, physical and verification tools, and has led to Synplicity's top position in FPGA synthesis, now provides the same fast runtimes and quality of results to ASIC and COT customers. The company's fast, easy-to-use products support industry standard design languages (VHDL and Verilog) and run on popular platforms. Synplicity employs over 280 people in its 20 facilities worldwide. Synplicity is headquartered in Sunnyvale, California. For more information visit http://www.synplicity.com .

About Lattice Semiconductor
Lattice Semiconductor Corporation provides the industry's broadest range of Field Programmable Gate Arrays ( FPGA ) and Programmable Logic Devices ( PLD ), including Field Programmable System Chips ( FPSC ), Complex Programmable Logic Devices ( CPLD ), Programmable Mixed-Signal Products ( ispPAC ® ) and Programmable Digital Interconnect Devices ( ispGDX ® ). Lattice also offers industry leading SERDES products.

Lattice is “Bringing the Best Together” with comprehensive solutions for system design, including an unequaled portfolio of non-volatile programmable devices that deliver instant-on operation, security and “single chip solution” space savings.

Lattice products are sold worldwide through an extensive network of independent sales representatives and distributors, primarily to OEM customers in communications, computing, industrial, consumer, automotive, medical and military end markets. Company headquarters are located at 5555 NE Moore Court, Hillsboro, Oregon 97124-6421, USA; telephone 503-268-8000, fax 503-268-8037. For more information about Lattice Semiconductor Corporation, visit http://www.latticesemi.com

Statements in this news release looking forward in time are made pursuant to the safe harbor provisions of the Private Securities Litigation Reform Act of 1995. Investors are cautioned that forward-looking statements involve risks and uncertainties including market acceptance and demand for our new products, our dependencies on our third party software suppliers, the impact of competitive products and pricing, technological and product development risks and other risk factors detailed in the Company's Securities and Exchange Commission filings. Actual results may differ materially from forward-looking statements.

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Lattice Semiconductor Corporation, Lattice (& design), L (& design), LatticeEC, LatticeECP, LatticeXP, ispGDX, ispPAC and specific product designations are either registered trademarks or trademarks of Lattice Semiconductor Corporation or its subsidiaries in the United States and/or other countries.

Synplicity, Synplify Pro, and Behavior Extracting Synthesis Technology are registered trademarks of Synplicity Inc. BEST is a trademark of Synplicity Inc.

GENERAL NOTICE: Other product names used in this publication are for identification purposes only and may be trademarks of their respective holders.

Synplicity Contact:
Joe Gianelli
Synplicity, Inc.
408-215-6000
joeg@synplicity.com

Lattice Contact:
Brian Kiernan
Lattice Semiconductor Corporation
503-268-8739
brian.kiernan@latticesemi.com