Subject: Re: [IBIS-Users] Questions Regarding Bird 75.8
From: Ross, Bob (bob_ross@mentorg.com)
Date: Wed Jan 08 2003 - 12:00:56 PST
Al:
I have uploaded a very generic sample cmos_3_state.ibs
CMOS buffer that reference an IBIS buffer and a Generic
SPICE test buffer under cmos_3_state.sp
The SPICE model is a reconfigurable to other modes.
http://www.eda.org/pub/ibis/samples/ver4.1/
I wish I had more time for more models and variations,
but this is a start. Arpad Muranyi stated that he is
also working on some samples to be posted later.
We are unable to offer some actual operating models
because they contain proprietary data, but the overall
concept has proven to be successful in actual test
cases with nearly identical syntax as the proposed BIRDs.
Bob Ross
Mentor Graphics
Al Davis wrote:
>
> Can someone please post examples of mixed IBIS-Spice,
> IBIS-Verilog, and IBIS-VHDL models so we can review them?
>
> I asked for this several times before and so far have gotten no
> useful responses. If the proponents of this BIRD are serious,
> they will have made some examples manually to demonstrate the
> concept. It is only by doing so that you can know enough about
> it to proceed further.
>
> I agree with the need, but I agree with Timothy that this
> approach is confusing. I further believe that it doesn't even
> come close to solving the problem that it is intended to solve.
>
> The examples should demonstrate that it works, and is superior
> to a Spice only (or *-AMS only) approach.
>
> If such examples cannot be produced and published, it should be
> rejected. It is the responsibility of those who think it is
> good to prove it.
>
> The proponents should also be able to explain:
>
> 1. How this impacts simulators that use only the [Model]
> portion of an IBIS file. (not [Component])
>
> 2. How it is superior to documenting an equivalence between the
> languages, like the equivalence between Spice and Verilog-A is
> documented.
>
> 3. How it impacts mixed-mode simulators.
>
> 4. How such a model can be developed and tested.
>
> If these questions cannot be adequately answered in this public
> forum, it should be rejected.
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