AUSTIN, TX – June 22, 2000 – Cirrus Logic, Inc. (NASDAQ:CRUS) today disclosed that on June 9th, the U.S. District Court for the Western District of Texas granted emergency relief to Cirrus Logic in its patent infringement and trade secret misappropriation suit against SigmaTel, Inc., ordering SigmaTel’s CEO to deliver an affidavit asserting non-use of the Crystal Semiconductor Netlist software program, along with the return of all copies.

Pursuant to the Court’s June 9th ruling, Cirrus Logic yesterday received an affidavit from SigmaTel president and CEO, Spence Jackson. While denying any wrongdoing, Jackson stated in his affidavit that SigmaTel has returned the copy of the CSC Netlist program that was in its possession.

The emergency relief granted to Cirrus Logic comes within months of the Texas Court’s granting Crystal Semiconductor permission to amend its complaint to include a claim of “Misappropriation of Trade Secrets” encompassing the CSC Netlist program and other proprietary information.

Litigation proceedings against SigmaTel involve intellectual property protected by U.S. Patent No. 4,851,841 issued to Cirrus Logic’s Crystal subsidiary. The CSC Netlist program was developed over a three-year period by Cirrus Logic’s Crystal Semiconductor subsidiary and has been in use by Cirrus Logic since 1994 as a proprietary design tool used together with other design software to develop Cirrus Logic semiconductor products.

Cirrus Logic is a premier supplier of high-performance analog and DSP chip solutions for Internet entertainment electronics. Building on its global market share leadership in audio integrated circuits and its rich mixed-signal patent portfolio, the company targets high-volume audio, storage and communications applications. Cirrus Logic sells its products under the Crystal ®, Maverick™ and 3Ci™ brands as well as its own name. Founded in 1984 in Silicon Valley, Cirrus Logic operates from headquarters in Austin, Texas and major sites located in Fremont, California and Broomfield, Colorado as well as offices in Europe, Japan and Asia. More information about Cirrus Logic is available at www.cirrus.com.

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