Subject: RE: [IBIS] FW: V-T Time Window in HSPICE
From: Silva, Benjamin P (benjamin.p.silva@intel.com)
Date: Thu May 23 2002 - 13:16:55 PDT
The IBIS model must have V-T windows that are no more than 1/2 the fastest
period. In this case, you would need buffers with <400ps V-T windows.
Regards,
Ben Silva
Intel Corporation
> -----Original Message-----
> From: John Angulo [mailto:jangulo@innoveda.com]
> Sent: Thursday, May 23, 2002 11:44 AM
> To: ibis@eda.org
> Subject: [IBIS] FW: V-T Time Window in HSPICE
>
>
> The following is posted on behalf of Timothy Coyle. Please
> address any
> private replies to Timothy.Coyle@nsc.com:
>
> --------------------
> Hello,
>
> I have a 1.25 GHz IBIS buffer I am trying to run in HSPICE.
> The issue
> I am having is that the buffer will not perform at this
> frequency using
> the supplied V-T data. The time window of the V-T data is 800psec.
> According to what I have seen/read, this time window defines
> the period
> of the IBIS buffer. I have also read that for some simulators, if the
> time window is larger than the pulse width, then it will not
> work. This
> seems to be
> the case for HSPICE. Using 200psec rise/fall times, my pulse width is
> 200psec and my period is 800psec. If I specify just the ramp
> data, then
> it works. Do I need to cut out the delay in my V-T data so
> it switches
> sooner and I can cut down the time window? I would like to be able to
> correlate the IBIS buffer to the original SPICE file at this
> frequency.
> Has anyone encountered this issue in HSPICE? ( I did use this IBIS
> buffer in XTK at this frequency without any issues)
>
> Thanks for any suggestions,
>
> Tim
>
>
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