( ESNUG 306 Item 13 ) --------------------------------------------- [12/3/98]
From: Andy Pagones-ACIC22 <Andy_Pagones-ACIC22@email.mot.com>
Subject: How Do I Put Routing Layer Preferences Per Pin In DC Libs?
Dear John,
I'm a new Synopsys user. Our cell library has lots of ways to save metal2
tracks by routing metal1 between adjacent cells.
We'd like Synopsys to choose pin connections based on routability. That
is, if a cell has a set of boolean equivalent pins but only one can connect
with metal1, then Synopsys should connect to *that* pin if its target
connection pin is also metal1-enabled.
Is there a way to specify this in the library??? I'd rather not try to
tweak delay numbers to make one pin more "attractive" than the others.
Perhaps there is another clever workaround.
- Andy Pagones
Motorola Chicago Corporate Research Laboratories Chicago, IL
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