同步Reset和异步Reset

同步Reset和异步ResetSynchronous Resets? Asynchronous Resets? I am so confused! How will I ever know which to use?

Clifford E. Cummings
Sunburst Design, Inc.

Don Mills
LCDM Engineering

ABSTRACT
This paper will investigate the pros and cons of synchronous and asynchronous resets. It will then look at usage of each type of reset followed by recommendations for proper usage of each type. This paper will also detail an interesting synchronization technique using digital calibration to synchronize reset removal on a multi-ASIC design.

1.0 resets, Resets, RESETS, and then there’s RESETS
One cannot begin to consider a discussion of reset usage and styles without first saluting the most common reset usage of all. This undesired reset occurs almost daily in systems that have been tested, verified, manufactured, an