RE: [IBIS-Users] warning with ibischk3.2

This model looks like there is zero current in your IV table. Was the
buffer in a tristate or input mode when the IV sweeps were simulated? Or is
this an open sink buffer with the load resistor terminated to ground?

Tom Dagostino
Teraspeed Consulting Group LLC
503-430-1065
tom@teraspeed.com
www.teraspeed.com

-----Original Message-----
From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org]On
Behalf Of lgreen
Sent: Friday, November 05, 2004 8:12 AM
To: 'Akhilesh CHANDRA'; ibis-users@eda.org; ibis@eda.org
Subject: RE: [IBIS-Users] warning with ibischk3.2

Hello, Akhilesh,

Do both the rising and falling SPICE waveforms pass through 1V with this
load? If this is a differential buffer, remember that IBIS only checks one
I/O pad at a time.

I would recommend trying ibishck4 to see if the problem still occurs. You
could also submit your model to the IBIS model review committee (please
include "IBIS Model Review Committee" in the subject).

- Lynne

PS: Does your production group really use 1-Meg as their timing test load?
Many companies use loads around 50-150 Ohms.

"IBIS training when you need it, where you need it."

Dr. Lynne Green
Green Streak Programs
http://www.greenstreakprograms.com
lgreen22@mindspring.com

-----Original Message-----
From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org] On Behalf
Of Akhilesh CHANDRA
Sent: Friday, November 05, 2004 5:16 AM
To: ibis-users@eda.org; ibis@eda.org
Cc: Akhilesh CHANDRA
Subject: [IBIS-Users] warning with ibischk3.2

Hello,

  I am geting following warning in one of my differential cell when I
run ibischk3.2. Can anybody help me to find out how it come and where it
effect because I run my cell lebel simulation with this model and result
are near to spice.

WARNING - Model 'LVPECLDRV_3V3': TYP VI curves cannot drive through Vmeas=1V
          given load Rref=1e+06 Ohms to Vref=0.9V
WARNING - Model 'LVPECLDRV_3V3': MIN VI curves cannot drive through Vmeas=1V
          given load Rref=1e+06 Ohms to Vref=0.9V
WARNING - Model 'LVPECLDRV_3V3': MAX VI curves cannot drive through Vmeas=1V
          given load Rref=1e+06 Ohms to Vref=0.9Vak, Michael wrote:

>Regards
>
Akhilesh

>
>

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Received on Fri Nov 5 09:19:56 2004