RE: [IBIS-Users] Simulation with VT tables for different load conditions

Surendra,
 
In addition to Tom's comments and my reply to it, I want
to add a little more to answer some of the other aspects
of your question.
 
Some tools support only up to four V-t tables. This may
be done in a variety of ways, such as picking the first
four, or picking the first two rising and first two falling
waveforms from the IBIS [Model]. I do not know which tool
does what, you need to ask your vendor about their algorithms.
 
Then there are some other tools which support all of the
V-t tables in the IBIS [Model], but again I don't know
what their algorithms are, so you need to ask them to
understand that.
 
I can give you an example for how it could be done through
an experiment I did with a colleague in the following
presentation (mostly pg. 15 and onwards):
 
http://www.eda.org/ibis/summits/jun03b/muranyi1.pdf
 
I hope this helps.
 
Arpad
==============================================================

________________________________

From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org] On
Behalf Of surendra.deshmukh@wipro.com
Sent: Thursday, September 16, 2010 6:33 AM
To: ibis-users@eda.org
Subject: [IBIS-Users] Simulation with VT tables for different load
conditions

Hi,

        The IBIS specification permits up to 100 (VT) waveforms to be
included to describe buffer transitions, using a variety of loading
conditions. Can I get the answer how these tables are used during
simulation for a different load condition?

        E.g. If VT tables are generated for C_fixture of 5pf and 10pf
and simulation has to be done with C_fixture of 8pf then how simulator
will take these 5pf and 10pf tables for its simulation at 8pf of load?

Thanks in advance.

Regards

Surendra.

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