Re: [IBIS-Users] question about IBIS simulation for a complete inverter

Dear Tom,
I agree with your statement that there is no description of the logic
function in IBIS model. Then, if I just want to compare the IBIS simulation
result of a complete inverter with its PSPICE simulation result, do I need
to simulate the output model only or cascade the IBIS input model with the
output model? It seems that the cascading way will be closer to the PSPICE
result, but I am not sure. I just directly treat the output signal of the
input model as the input signal of the output model.
Thanks and regards,

Ji Yuancheng

On Thu, Mar 18, 2010 at 12:17 AM, Tom Dagostino <tom@teraspeed.com> wrote:

> Ji
>
>
>
> Historically IBIS Signal Integrity simulators are not designed to simulate
> the transfer function of the parts in the nets you are simulating, they only
> concern themselves with the interaction of the I/O buffers and the
> transmission line medium that is between them. There is no description of
> the logic function, delay or any of the other requirements that may be
> needed to generate the timing of signals from input to output in an IBIS
> model. There are some timing simulators that do at least some level of
> input to output simulation.
>
>
>
> Tom Dagostino
> Teraspeed(R) Labs
> 13610 SW Harness Lane
> Beaverton, OR 97008
> 503-430-1065
>
> 503-430-1285 FAX
> tom@teraspeed.com
> www.teraspeed.com
>
> Teraspeed Consulting Group LLC
> 121 North River Drive
> Narragansett, RI 02882
> 401-284-1827
>
>
>
> *From:* owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org] *On
> Behalf Of *ji xiao
>
> *Sent:* Wednesday, March 17, 2010 8:06 AM
> *To:* ibis-users@eda.org
> *Subject:* [IBIS-Users] question about IBIS simulation for a complete
> inverter
>
>
>
> Dear Sir/Madam,
>
> As a beginner worked with IBIS model, I met a problem about the
> IBIS simulation for a complete device. Let's take an inverter as an example.
> If I want to model a complete inverter including the transfer function by
> using IBIS, do I just need to simulate the output model only(i.e. does the
> output model contain the transfer function) ? or cascade IBIS input model
> with output model?
> If we need to cascade them, does that mean just to receive the
> output signal of the input model as the input signal of the output model?
>
> Thanks and regards,
> Ji Yuancheng
>
>
>
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