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

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From: Jim Freeman (freeman@broadcom.com)
Date: Fri Nov 19 1999 - 10:42:22 PST


HI All,
    The faux models are patently obvious but at least are checked out by the vendor and have a correlation to their actual models for the purposes of I/O modelling. In addition, youcan model a transistor instead of a voltage or
current source.

Jim Freeman

Jonathan Dowling wrote:

> Chris/Scott,
>
> Vendors who use Spice as their process tool are sometimes
> reluctant to release the *actual* Spice model to customers.
> This means that the Spice model that is released is a
> cut-down approximation (like the Merced Hspice model).
> Sometimes the Spice model is behavioralized, defeating
> the purpose of using Spice in the first place.
>
> Perhaps Micron's DDR Spice model is the real-deal, but I
> have it on authority that Samsung's is faux.
>
> Jonathan Dowling
>
> --- Scott McMorrow <scott@vasthorizons.com> wrote:
> > Chris Cheng wrote:
> >
> > >
> > > spice only for DDR i/o but then again, why do
> > > u need ibis if u have the full spice......
> >
> > Lets see ...
> > Faster performance in simulation by 10-100X ...
> > Encapsulation of standard measurement points ...
> > Encapsulation of package parameters ...
> > Equivalent or better accuracy depending on method of
> > creating and characterizing the model ...
> > More widespread simulator support.
> >
> > Hmmm ... I can't imagine what the need or desire for
> > IBIS models would be.
> >
> > 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
> >
> > > begin:vcard
> > n:McMorrow;Scott
> > tel;work:503-708-4320
> > x-mozilla-html:FALSE
> > url:www.siqual.com
> > org:SiQual, Signal Quality Engineering
> > adr:;;18735 SW Boones Ferry Road;Tualatin ;OR;97062-3090;USA
> > version:2.1
> > email;internet:scott@vasthorizons.com
> > title:Principal Engineer
> > note:asdfsdaf
> > fn:Scott McMorrow
> > end:vcard
> >
>
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