( ESNUG 368 Item 9 ) --------------------------------------------- [04/12/01]
From: Dyson Wilkes <Dyson.Wilkes@swindon.ericsson.se>
Subject: It's Frustrating How PrimeTime Partially Ignores Its Commands...
Hi, John
Here is a quote from an engineer working with me:
"The worst problem that I've come across so far is PrimeTime's inability
to correctly implement false paths. For example, setting false paths
between all asynchronous clock domains (as suggested by Synopsys) does
not always work."
And another:
"Also use extreme caution with the 'reset_design' command, you can easily
be resetting far more than you bargained for!"
I observed this "ignoring false paths" problem in the early days with
PrimeTime. The realy frustrating thing is that you do not get to find out
the tool has (partially) ignored your command until you get the results
from the next report. Why, oh why, does it not tell you it has ignored
you? There seems to be no way to find out why either!
I just wondered if other users have had similar problems or have some
suggestions on how to solve this problem?
- Dyson Wilkes
Ericsson Microelectronics Europe
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