Re: FW: [SI-LIST] : IBIS datasheets for PCI and DDR

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From: Mike Mayer (Mike.Mayer@cp.artesyn.com)
Date: Thu Nov 18 1999 - 15:59:00 PST


>>>>> "Richard" == Richard A Schumacher <schumach@valencia.rsn.hp.com> writes:

[...]

> If the notion of IBIS is at all worthwhile, then vendors should
> not be allowed to call a model an IBIS model unless and until
> they are willing to attest to or demonstrate the model's
> correctness, at least in some minimal set of defined situations.
> Passing the golden parser and having every pin correctly
> simulate the vendor's own standard load for that pin would be a
> good start.

I always try to inform suppliers when there are problems with their
IBIS models, even if it is something that I can fix with a text
editor. An example is a model that uses the [Pin] keyword but does not
specify all pins on the device. I quite often find this in logic
parts. I have also gotten models that are so bad that it is obvious
that no one ever ran them in a simulator. One such model was for a 128
Mbit SDRAM.

I can only conclude that the people who are simulating with models are
a small enough minority that suppliers don't have a reason to put any
effort into providing accurate models.

-- 
=============================================================================
Mike Mayer                               Artesyn Communication Products, Inc
Senior Hardware Design Engineer          Madison, WI
Mike.Mayer@cp.artesyn.com                http://www.artesyn.com/cp
=============================================================================

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