Subject: RE: [IBIS-Users] number of waveforms
From: Tom Dagostino (tom@teraspeed.com)
Date: Tue May 27 2003 - 09:38:31 PDT
Anything is possible but whether it gets used is the important issue. IBIS
allows up to 100 different waveform tables in a model statement. Usually
there will be two rising and two falling waveforms for a given load
resistance. One rise to ground and one rise to Vcc plus one fall to ground
and one fall with the resistor terminated to Vcc. You can use several
different load resistors and terminate to different voltages as long as you
keep the number of waveform tables to under 100. But many simulators will
not know what to do with all the waveforms. Some will just look at the
first 4 waveform tables and ignore the rest.
Tom Dagostino
Teraspeed Consulting Group LLC Teraspeed Consulting Group LLC
2926 SE Yamhill St. Device Modeling Division
Portland, OR 97214 13610 SW Harness Lane
Beaverton, OR 97008
http://www.teraspeed.com 503-430-1065
tom@teraspeed.com
-----Original Message-----
From: owner-ibis-users@server.eda.org
[mailto:owner-ibis-users@server.eda.org]On Behalf Of
erik.van.der.ven@philips.com
Sent: Tuesday, May 27, 2003 6:43 AM
To: ibis-users@server.eda.org
Subject: [IBIS-Users] number of waveforms
Dear IBIS users,
It is possible to specify more than one waveform table, for instance with
different loads.
I have studied many IBIS models by semiconductor companies. All models I
have seen give only one waveform (both rising and falling).
What is the purpose of specifying more than one waveform? Does this yield
better results in the simulator if the load differs from the standard load?
With kind regards,
Ir. Erik van der Ven
Room DB1032
Business Line Networking Infrastructure
Philips Semiconductors BV
Gerstweg 2
6534 AE Nijmegen
The Netherlands
Phone: +31-24-3534334
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