RE: [IBIS-Users] V-T different durations

Hi Fabio,

I asked this same question a few months ago and from what I recall the
responses were that most modern EDA tools can properly account for the
different VT length durations and it is not an IBIS spec violation. I was
concerned with potential over-clocking situations based upon the different
VT duration lengths. I have not done any follow up testing myself.

I have run into issues with some EDA tools that in certain situations do
have problems with these types of models. So you may want to do some testing
at least with one EDA tool to make sure it's not going to produce unexpected
results.

Best,

Tim

From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org] On Behalf
Of Fabio BRINA
Sent: Friday, July 08, 2011 10:24 AM
To: 'ibis-users'
Subject: [IBIS-Users] V-T different durations

Hello experts,

  a simply question (I suppose!) :

   Can I have different durations for the four V-T waveforms ?

   Till today I generated Rising0, Rising1, Falling0, Falling0 curves

    using the same durations, but Can I have the following situations:

    Rising0 à 12 ns duration

    Rising1 à 10ns duration

   Falling0 à 8ns duration

    Falling1 à 11ns duration

   Standard does not preclude it, but can cause problems to user?

 Thank you in advance.

Fabio

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