Re: Exact Timing Constraints vs. Over-Constraining

Larry, I disagree. Metastability delay is statistically unbounded
(although less than 3 ns in all but perverse cases). But you should not
throw this in willy-nilly. Whenever you have a truly asynchronous
interface, you should be aware of it. If many or most of your timings
are prone to metastability, there is something wrong with the design approach...

Peter Alfke
====================
Larry Doolittle wrote:
> Don't forget metastability slack.  In theory it does not apply to the
> purely synchronous nets; in practice I don't want to go through the
> work of separating them out, and it's a good excuse to add one more
> conservative assumption.
> 
>        - Larry