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

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From: Richard A. Schumacher (schumach@valencia.rsn.hp.com)
Date: Thu Nov 18 1999 - 13:19:47 PST


> To me, though, the largest benefit the industry has gained from IBIS is that
> models are now widely available. Imagine trying to do your high speed
> designs without them. IBIS removed the log jam that prevented engineers from
> getting models at all. And it has evolved to attempt to keep up with
> emerging needs. It trails, and will probably always trail, the leading edge
> of our needs, but it sure beats the alternative (no models at all), and it

Well, not necessarily when the vendor's IBIS model is flawed.
This can occur in such a way that the error doesn't turn up
until a board is routed and timed, or even until a prototype
is built and tested. Better no model at all (which causes
one sig int engineer to work on building one) than one which
causes a dozen designers to propagate an error.

Perhaps vendors should be prohibited from using the IBIS name
unless they certify the accuracy of their model or attest
to it with measurements. Until then, Caveat Emptor.

regards,
Richard Schumacher
Hewlett Packard

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