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Clock Domain Crossing Demystified: The Second Generation Solution for CDC Verification

Authored on: Mar 13, 2008 by Prakash Narain and Clifford Cummings

Technical Paper

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With the growing trend toward use of systems-on-a-chip (SOCs), designs with multiple asynchronous clock domains are becoming commonplace. With the emergence of asynchronous clock domain crossing (CDC) verification tools, users have a way to verify their designs. However, first generation CDC tools do not provide adequate support for a top-down, bottom-up CDC verification methodology; also, extensive manual setup and signoff requirements create serious deployment limitations. This causes inconsistent usage of the tools and wasted engineering resources without covering the CDC failure risk.

This paper describes an efficient, reliable and practical CDC verification methodology for effective timing closure verification (TCV).



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