Xilinx is a developer of user-programmable gate arrays in which customers create their own custom gate arrays without the delays or engineering charges normally associated with ASIC devices.

WaferScale Integration produces a family of of high-performance field-programmable peripheral integrated circuits (PSD) as well as a broad line of high-performance non-volatile PROM and EPROM memory products, all based on proprietary technology.

Crystal Semiconductor is a manufacturer of telecommunications ICs that combine both linear and digital functions for the graphics, audio, video and multimedia market places. Sold to Cirrus Logic. (Nasdaq: CRUS).
Source – Dow Jones VentureSources

Credence Systems develops, manufactures and markets semiconductor automatic test equipment (ATE) used in the production of semiconductors. The company serves a broad spectrum of the semiconductor industry’s testing needs through a wide range of products that test digital and mixed-signal semiconductors.