( ESNUG 221 Item 5 ) ---------------------------------------------- [7/13/95]
From: biswal@india.ti.com (Krutibas Biswal)
Subject: DB2EDDM Chokes When Number Of Nets In Region Is High
John,
Most of the customers I support use Synopsys as the front end synthesis tool
and they translate to Mentor for ATPG and Simulation. All of them use SIFF
to translate to Mentor (not thru EDIF->ENWRITE of Mentor).
Synopsys supplies DB2EDDM as part of the SIFF software, which is a schematic
translator. When I use DB2EDDM for a design which has feedthroughs or
shorted nets, DB2EDDM is expected to put a NETCON in the EDDM schematic that
it creates. I have a netcon symbol in the ".sdb" symbol lib that I use to
create schematic. I have a "-NETCON" entry in the "library.map" file used
by DB2EDDM. It works properly when the designs having feedthroughs etc are
small, but fails when the congestion is high, i.e. number of nets in
that region is large. DB2EDDM gives :
"(warning) Unable to fix all feedthroughs on sheet <XXX> of design <YYY>."
Any idea as to how to fix this problem ??
- Krutibas Biswal
Texas Instruments (India)
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