Re: Package Parasitics

Hi,
    I know that PKG and EBD are part of the IBIS specification, but I don't
know the relation between the .EBD and .IBS file and how to use the .EBD file.
Thanks in advance.

"Nelson, Kerry" wrote:

> In addition to other reasons...
>
> We have often found this section of the IBIS model to be inadequate in
> describing our CPU and chipset packages. For example, there is no way to
> include a transmission line element of any sort. We usually use a Package
> Model or an Electrical Board Description (EBD) to more accurately describe
> the package. (Both are part of the IBIS specification.) In those cases we
> will set R_pkg, L_pkg, and C_pkg to zero.
>
> I hope that helps.
> Kerry
> Intel Corp.
>
> -----Original Message-----
> From: Mark Bossard [mailto:mbossard@atmel.com]
> Sent: Wednesday, April 25, 2001 6:10 AM
> To: Syed Huq
> Cc: r6aabt@email.sps.mot.com; ibis-users@eda.org
> Subject: Re: Package Parasitics
>
> I agree with Syed...
>
> The ASIC house I work in does supply ibis models to our customers that
> are simply an ibis model for one I/O buffer. They are many times left
> without package RLC so they can be filled in depending on the package
> that is used.
>
> -Mark Bossard
> Atmel Chesapeake Design Center
>
> Syed Huq wrote:
> >
> > One reason could be is that a ASIC vendor is simply creating "buffer only"
> > models without any package parasitics. Once the ASIC is defined(with
> package)
> > then you create the full IBIS model with all the individual buffers along
> > with the package parameters..
> >
> > For a commercially available component, it does not make sense to have
> > a model without the package parasitics.
> >
> > Syed
> > Cisco Systems, Inc
> >
> > >
> > > > |
> > > >
> > > > I have found other models that have these values set to zero:
> > > >
> > > >
> > > > > > > [Package]
> > > > > > > R_pkg 0 0 0
> > > > > > > L_pkg 0 0 0
> > > > > > > C_pkg 0 0 0
> > > >
> > > > Can you explain why these values are used, i.e. why the model would be
> > > > realistic with no package parasitics?
> > > >
> > > > Thanks for your help.
> > > >
> > > > Best regards,
> > > > Jay Azurin
> > > > Motorola NetComm Applications
> > >
>
> --
>
> ========================================================================
> | Mark Bossard | |
> | Direct Phone: (410) 872-9267 | Atmel Corporation |
> | Main Phone: (410) 312-4400 | Chesapeake Design Center |
> | Fax: (410) 312-4424 | 6740 Alexander Bell Dr, Suite 100 |
> | Email: mbossard@atmel.com | Columbia, MD 21046 |
> ========================================================================

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