RE: [SI-LIST] : modeling languages (was: receiver jitter)

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From: Chris Cheng (hycheng@3pardata.com)
Date: Mon Jan 24 2000 - 14:02:33 PST


there is no reason why the scaling factor needs to be encrypted.
besides, hspice can have different scaling factor for different
transistor model.
chris

-----Original Message-----
From: owner-si-list@silab.eng.sun.com
[mailto:owner-si-list@silab.eng.sun.com]On Behalf Of D. C. Sessions
Sent: Monday, January 24, 2000 7:44 AM
To: si-list@silab.eng.sun.com
Subject: Re: [SI-LIST] : modeling languages (was: receiver jitter)

Jim Freeman wrote:
>
> Hi Fred,
> Hspice will accomodate different models from different vendors but not
automatically. If scale is the same for different models, all you
> have to do is rename the models from other vendors with a unique name and
edit the netlist to reference the same name. I have simulated up to
> 8 different technologies in the same simulation using this technique. I
have no idea how high it can go but I suspect the limit has to do more
> with the simulation machine than the Hspice code.

That's fine if you have editable models.
The problem arises when people propose *encrypted* models as
a solution to the distribution-of-proprietary-data problem.

> Fred Balistreri wrote:
>
> > Hello Jim, the answer is no. Not even Hspice will do that if the
> > parts are from different vendors that use different modeling
> > methodologies. Hspice also uses propietary models, those
> > cannot be done by law. However the levels that are public
> > are compatible. That is one of the reasons why I said I
> > understand why people use Hspice.
> >
> > However realize that Hspice is designed for IC not SI
> > engineers. Where as Aspice is designed for SI engineers.
> > The advantages we have are not in the IC areas but rather
> > in the SI area. I realize that transistor level model do play
> > an important role and for that we do have a solution although
> > it may not be as "clean" as one would like.
> >
> > Best Regards,
> >
> > Jim Freeman wrote:
> >
> >> Part 1.1 Type: Plain Text (text/plain)
> >> Encoding: 7bit
> >
> > --
> > Fred Balistreri
> > fred@apsimtech.com
> >
> > http://www.apsimtech.com
> >
> >

--
D. C. Sessions
dc.sessions@vlsi.com

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