Re: NCSA s2ibis

Katja:

I believe this is a bug in s2ibis2. However, direct
subtraction must be done carefully because subtracting
two tables with large diode currents causes loss in
numerical resolution. So extrapolating the [Pullup]
table so that it does not include the extra diode
information is often a better solution.

Bob Ross
Mentor Graphics

Katja Koller wrote:
>
> I have a question to the s2ibs tool fron NCSA:
>
> I made a tristate-model and found that the [Pullup]-curve has still a
> diode-current from vcc to 2*vcc. It is the same amount of current, that
> is present in the [GND_clamp].
> I thought due to the ibis-spec all the Diode-current has to be
> subtracted
> from the high-curves, not only the [POWER_clamp].
>
> I hope, you can help me with this,
>
> Katja Koller
>
> --
> Katja Koller ICN M TC 16
> Siemens AG Hofmannstr. 51 81359 Muenchen
> Katja.Koller@icn.siemens.de
> Tel: 0049 89 722 45719 Fax: 0049 89 722 44692
Received on Fri May 19 08:21:49 2000