( ESNUG 250 Item 3 ) -------------------------------------------- [9/6/96]
From: Andrew Frazer <Andy.Frazer@idt.com>
Subject: I Need Better Control Of Synopsys SDF File Generation
Hey, John, I have a question about SDF files.
We are trying to use Synopsys for our pre-layout delay calculator. We use
Synopsys to write out the SDF file, then we back-annotate the SDF file into
Verilog and/or Ikos.
The problem is that Synopsys writes out an SDF file where all three timing
parameters (min/typ/max) are identical because it calculates the delays
based on the last "set_operating_conditons" command.
We want to write out one SDF file where "min" delays are calculated
with "best_case_commercial" operating conditions, "typ" delays are
calculated with "typical_case" operating conditions, and "max" delays
are calculated with "worst_case_conditions".
The current workaround is to write out three different SDF files, each of
which is calculated with under different operating_conditions. Any ideas?
- Andy Frazer
Integrated Device Technology
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