Subject: [IBIS-Users] Multi Power Buses IBIS models.
From: Anshuli Goel (anshuli@india.ti.com)
Date: Thu Aug 22 2002 - 04:05:56 PDT
Hi
I am trying to generate the IBIS model for input model with multiple VDD
and VSS supply.I have in by ckt 2 VDDs and 2VSS.One VDD operates at 3.3 and
another at 1.8.The circuitry that is in direct contact with outside world
is working at 3.3 Volt while other circuitry is working on 1.8 V . As there
is no option to model these multi power buses in s2ibis2 utility . What
should I do to eliminate this problem.?
One more thing is Vinl and Vinh parameter must for input model to be
supplied in s2ibis2 utility ?
What is the difference in vinl,vinh and Vil and Vih . ? Where and how
these parameters should be used ?
If anybody can answer my querries that will be really helpful. ?
Regards
Anshuli Goel
Texas Instruments
attached mail follows:
Hi
I am trying to generate the IBIS model for input model with multiple VDD
and VSS supply.I have in by ckt 2 VDDs and 2VSS.
One VDD operates at 3.3 and another at 1.8
As there is no option to model these multi power buses in s2ibis2
utility . What should I do to eliminate this problem.?
One more thing is Vinl and Vinh parameter must for input model to be
supplied in s2ibis2 utility ?
What is the difference in vinl,vinh and Vil and Vih . ? Where and how
there parameters should be used ?
In generating the models I am able to generate the GND clamp curve
properly but in Power Clamp curve I am getting very low values of
current . What could be the reason for this ?
If anybody can answer my querries that will be really helpful.
Regards
Anshuli Goel
Texas Instruments
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