RE: [SI-LIST] : IBIS model gives numerous errors

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From: Beal, Weston (weston_beal@mentorg.com)
Date: Tue Apr 17 2001 - 08:54:13 PDT


Jason and Itzhak,

Be very careful with the scheme command cited below! This will allow bad
data into your simulation. ICX reports the error for a good reason. You
really need to look at the sum of the curves on which ICX reports the
non-monotonic error. Ask your local AE for the ibischart utility that will
show these sums. If you don't get prompt response through that channel then
email me directly and I can help you.

Regards,
Weston

-----Original Message-----
From: Itzhak Hirshtal [mailto:hirshtal@is.elta.co.il]
Sent: Monday, April 16, 2001 11:09 PM
To: Stubbs, Jason
Cc: Si-List (E-mail)
Subject: Re: [SI-LIST] : IBIS model gives numerous errors

Hello,

For your first question: This is a known feature with the V-I curves of IBIS
models, which
are purposely made non-monotonic. I don't know why ICX issues these
messages,
perhaps because there can be non-monotonicities which are not good, but it's
hard to distinguish between them. Anyway, to get rid of the message and
enable
you to load the model into your ICX environment, you should issue the
following
command in the command window (open it from the "options" menu):

(setupIbisModelChecker '("monotonicCurves" "#f"))

(Type CR at the end of the command)

Type this command exactly as it appears above, with the appropriate capital
letters. Do it after you open your design view and before you try to load
the
model. Good luck.

Stubbs, Jason wrote:

> I have an IBIS buffer model that I downloaded from Lucent for their ORCA
3T
> FPGA called OBZ12F that gives me numerous errors when I try to read it in
to
> ICX as part of an IBIS part model. The errors are non-monotonic, and I
> usually try to correct these by editing the appropriate tables, but I'm
not
> having any success with this model.
>
> Does anyone have any suggestions on the best way to remove non-monotonic
> errors?
>
> Also, regarding the IBIS spec, I know that [pullup] is referenced to Vcc &
> [pulldown] is referenced to GND, but is it the same for the [power clamp]
> and [GND clamp] or are they both referenced to GND?
>
> Regards
>
> Jason Stubbs
>
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--
Itzhak Hirshtal
Elta Electronics
POB 330 Ashdod
Israel 77102
Tel: 972-8-8572841
Fax: 972-8-8572978
email: hirshtal@is.elta.co.il

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