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

Hi Fabio,
One thing to keep in mind is that S2IBIS defaults to a transient time of 10ns. So you will need to add the keyword to your s2ibis file to lengthen this time to accommodate the longest transient time to prevent data truncation.

Regards,
-Graham

Link:
http://www.ece.ncsu.edu/erl/abstracts/s2ibis2_doc.html
[Sim time] t
        t = Spice transient simulation time
        Optional.
        Default: t = 10ns.
       Describes the transient simulation time to be used by Spice.

From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org] On Behalf Of Timothy Coyle
Sent: Friday, July 08, 2011 11:02 AM
To: 'Fabio BRINA'; 'ibis-users'
Subject: 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 --> 12 ns duration
    Rising1 --> 10ns duration
   Falling0 --> 8ns duration
    Falling1 --> 11ns duration

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

 Thank you in advance.

Fabio

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