[IBIS-Users] RE: IBIS Delay Model

Nagarjuna,

Are these "rm_dly_*" keywords part of the HSPICE B-element?
If so you should be able to get an answer from your colleagues
at Synopsys to the question on what it does. IBIS certainly
doesn't have such keywords in the specification.

My personal opinion is that the removal of any flat portions
in the waveform tables should not have any effect on the
rest of the waveform, is the slope and other artifacts of
the waveforms should be retained. Also, the amount that is
removed from the beginning of the waveforms should be the
same among all of the waveforms, otherwise the model's
behavior will be changed in an undesirable manner.

Thanks,

Arpad
================================================================

From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org] On Behalf Of Nagarjuna Vallamkonda
Sent: Wednesday, September 21, 2011 12:23 AM
To: ibis-users@eda.org
Subject: [IBIS-Users] IBIS Delay Model

Hi

As we know that, rm_dly_* keywords are used to remove the initial and flat tail delay for rising and falling waveforms in HSPICE. Does these keywords have any impact on rising and falling times of waveforms?

When we compare the results of HSPICE with Mentor ICX Pro explorer, I see different results for the two tools. Why is it happening so for such a simple circuit?

Can anyone help me regarding this ASAP.

Thanks & Regards
Nagarjuna

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