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Archive for January 9th, 2014

CDC Verification of Fast-to-Slow Clocks – Part One: Structural Checks

Thursday, January 9th, 2014

This is the first in a short blog series that addresses the issue of doing clock domain crossing analysis where the clocks differ in frequency, and the use of three different techniques for a complete analysis.

INTRODUCTION

CDC checking of any asynchronous clock domain crossing requires that the data path and the control path be identified and that the receive clock domain data flow is controlled by a multiplexer with a select line that is fed by a correctly synchronized control line.  Meridian CDC will always identify all the data and associated control paths in a design and will ensure that the control signals passing from a transmit clock domain to an asynchronous receive clock domain are correctly synchronized.  There are three separate techniques that are used within Meridian CDC: structural checking, formal checks and simulation-based injected metastability checks.

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