( ESNUG 442 Item 8 ) -------------------------------------------- [03/24/05]
Subject: ( ESNUG 434 #7 ) How To Get Nassda HSIMplus Violations in GDSII
> I thought your readers might be interested in the steps required to take
> Calibre-xRC hierarchical parasitic netlist output into Nassda HSIM.
>
> - Claudia Relyea
> Mentor Graphics Wilsonville, OR
From: Mike Demler <mdemler=user domain=nassda spot calm>
Hi John,
After completing back annotation of Calibre-xRC extracted parasitics into
HSIM, users will also be interested in knowing how to generate graphical
output for viewing the results of HSIMplus power and signal net
reliability analysis.
The HSIMplus PWRA option performs dynamic analysis of IR drop and
electromigration in power nets with a unique two-step direct-coupled
approach. After IR drop and current density results have been calculated
and stored into .radb files during the power net analysis phase, HSIMplus
can create a violation map in GDSII format. Users can then overlay the
violation map on their original layout. Visualization marks different
values of IR drop or EM current density with different colors as specified
by the user. The violation map GDS output file is created in one of
two ways:
1. ralayout is specified in the *.ratcl file.
2. Using -ralayout as a parameter in HSIM invocation.
Users have a choice of the type of IR drop and current density measurements
that are performed. Assuming that a user specified maximum IR drop (vmax)
with RMS current density (irms), a violation map can be generated using the
command: hsim -ralayout vmax test-vdd
I hope this is useful to your readers.
- Mike Demler
Nassda Santa Clara, CA
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