Subject: Re: ibis
From: john austin (john_austinus@yahoo.com)
Date: Tue Sep 18 2001 - 14:41:17 PDT
Thank you Adam and to all to those who responded.
--- Adam.Tambone@fairchildsemi.com wrote:
>
> John,
>
> My apologies for the delay in this response.
>
> I am still not clear as to what you have or what you
> want to create.
> Perhaps some very general and simplified advice can
> get you started.
>
> First inspect the material available at the IBIS
> site mentioned by Arpad,
> especially the specification itself. IBIS models (
> datasheets ) contain DC
> and Vt data in addition to other parameters
> associated with the buffer
> being modeled. The DC and Vt data can be gained via
> simulation ( SPICE to
> IBIS ) or through lab measurement. Most of the
> additional parameters can
> be gained from the device's datasheet such as Vinh
> and Vinl. Collectively
> this data comprises a IBIS datasheet which can be
> used by various
> simulators to perform limited SI simulation and
> analysis. These simulators
> read a IBIS datasheet and create their own
> behavioral model based on the
> information contained therein. Creating your own
> behavioral model from a
> IBIS datasheet is not a trivial task.
>
> Hope this helps,
> Adam Tambone
>
>
>
>
>
>
> john austin <john_austinus@yahoo.com>@eda.org on
> 09/18/2001 11:58:23 AM
>
> Sent by: owner-ibis-users@eda.org
>
>
> To: Adam Tambone/SouthPortland/Fairchild@Fairchild
> cc: ibis-users@eda.org
>
> Subject: Re: ibis
>
>
> I have spec which specify the AC, DC requirement.
> The specs contain V/I curves pullup & pulldown.
> Also,
> the references curves of the pullup and pulldown.
>
> I am looking to write an approximate behavioral
> model
> for it. So I want to know what equations or
> portions
> of the specs I need to pay attention to, to create
> V/I
> tables, rising & falling waveforms.
>
> I have some idea on how to proceed( based on other
> IBIS models) but still I wanted to see a methodology
> or guidelines already used by an expert.
>
> Thanks
>
> --- Adam.Tambone@fairchildsemi.com wrote:
> >
> > John, could you be more specific?
> >
> > Adam
> >
> >
> >
> >
> >
> >
> > john austin <john_austinus@yahoo.com>@eda.org on
> > 09/17/2001 07:11:34 PM
> >
> > Sent by: owner-ibis-users@eda.org
> >
> >
> > To: ibis-users@eda.org
> > cc:
> >
> > Subject: ibis
> >
> >
> > If I want to create a behavioral model out of a
> > spec.
> > Could you please let me know what I should watch
> > for?
> > Also, if there is any documents or paper out there
> > that facilitate the task?
> >
> > Thanks
> >
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