Re: Ver. 3.2 and Ver. 2.1 Models

We at SiQual provide IBIS version 3.2 models which
include only version 2.1 features quite often. There are
two reasons for this:

1) This causes ibischk3 to perform it's highest level
of syntax checking.

2) Because it is our only leverage to encouraging
CAD vendors to update their simulators to support
3.2 features.

Recently, however, almost all of the models which we have
developed use IBIS 3.2 features. Model Spec,
Dynamic Clamps and Model Selector come to mind.

Quite honestly, it is frustrating to us to find that only
one simulator vendor can consistently support these advanced
features in version 3.2. As a result, I have no problem
in encouraging all vendors to provide version 3.2 models.

Anything we can do on the model creation end to
speed the adoption of 3.2 syntax in simulators is
goodness for the industry.

BTW, SiQual is also providing IBIS models which have
been correlated to the original Spice decks and include
the IBIS Accuracy Trailer as documentation. I would
strongly encourage all model creators to do the same.

best regards,

scott

--
Scott McMorrow
Principal Engineer
SiQual, Signal Quality Engineering
18735 SW Boones Ferry Road
Tualatin, OR  97062-3090
(503) 885-1231
http://www.siqual.com
Mike LaBonte wrote:
> Periodically I hear that IC vendors feel pressured by users to provide IBIS 3.2 models.
> I concur with Bob's point, and would like to suggest that it is primarily up the IC vendor
> to make this determination on a part-by-part basis. If a part can be modeled with reasonable
> accuracy using only IBIS 2.1 features, then there may be no reason to utilize IBIS 3.2
> features. So when customers ask for 3.2 models, it would be best to ask why. Hopefully
> the reason is not "because it is the latest IBIS".
>
> Mike LaBonte
> Cadence Design Systems
>
> Bob Ross wrote:
> >
> > Mike:
> >
> > I would use and supply Version 3.2 models only when Version 3.2 features
> > are needed to accurately describe the part.  Otherwise, I would still
> > supply Version 2.1 models.
> >
> > Bob Ross
> > Mentor Graphics
> >
> > mike.magdaluyo@philips.com wrote:
> > >
> > > To Model Users and EDA Vendors:
> > >
> > > Philips Semiconductors offers numerous standard logic Ver. 2.1 IBIS models.  We are planning to start generating Ver. 3.2 models but would like your feedback on an issue.  We are trying assess how many people have capability to run Ver 3.2 models and who
> > > can use only Ver 2.1 models.  Due to the number of logic families and products we have, we want to avoid maintaining 2 sets of libraries per product family for both versions, but we need to see that our customers' needs are met too.  Your comments would
> > > be greatly appreciated.
> > >
> > > Mike Magdaluyo
> > >
> > > Logic Products Group
> > > Philips Semiconductors
> > > (408) 991-2642