Re: [SI-LIST] : Bad IBIS models!

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From: Mike LaBonte (mikelabonte@cadence.com)
Date: Thu Mar 16 2000 - 05:43:01 PST


The IBIS web page at http://www.eia.org/EIG/IBIS/ibis.htm has a Support link
to a page that advertises the FREE Model Review Service, which states:

  IBIS Model Review: If you are developing an IBIS model and would like to have
  your model reviewed, you may send your model to this address. This is a
  confidential and FREE service provided by the IBIS Model Review committee
  comprised of a number of EDA vendors. Feedback about the model will only
  be passed to the requestor of this service. Model Review Service is intended
  for use by IC MANUFACTURERS ONLY !(large or small).

The page has a hotlink with the email address to send to. Hopefully, IC vendors
are setting up reapeatable processes for producing IBIS models. It could take as
little as submitting one sample to help get a flawed process back on track.

Mike LaBonte

Stephen Nolan wrote:
>
> SI-List,
>
> What, exactly would be the QC steps that you would like to see component vendors
> ensure that their models pass, prior to release?
>
> What I've gleaned so far:
>
> - Validate to IBISCHK3 and document exceptions to warnings.
>
> - Validate all curves with a visual graphing for discontinuity, or other
> visually obvious errors.
>
> - Validate that the VI curves pass through origin.
>
> - Verify that a full pin map exists and is accurate against datasheet.
>
> - Verify that all models exist.
>
> - Validate accuracy of package parastics.
>
> - Validate accuracy of dV/dt. Use 50 ohm load or datasheet load?
>
> - Include and validate accuracy of C_comp, including min and max.
>
> - Include 4 VT curves minimum. Use 50 ohm load or datasheet load?
>
> - Include accurate Min, Typ, Max data, derived from a setup that has full
> variation across PVT.
>
> What else? Thanks.
>
> --
> Regards,
> Stephen M. Nolan
>
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