[IBIS] Validation of composite current

From: Rinsha Reghunath <Rinsha.Raghunath@synopsys.com>
Date: Fri Mar 08 2013 - 08:01:00 PST
Hi,

I am trying to validate an IBIS 5.1 model generated for DDR3 with ISSO_PU/PD and Composite Current data. The V-T and I-T data is not clipped in order to capture pre-driver current better and the I-T table has 1000 points. When I tried to do a transient analysis for validation, SPICE and IBIS V-T waveforms are matching at the DDR3 frequency, but IBIS I-T curves are getting truncated at the rise and fall transitions and doesnot correlate well with SPICE. The pre-driver current is being lost. When the frequency is reduced, there is good SPICE - IBIS matching for I-T.

Is this issue known or is it an issue in the IBIS model?

I have read in http://www.eda.org/ibis/summits/may11/m051111.pdf that "adding [Composite Current] data to the model reduced the valid switching rate of the model." Is the above issue related to this?

Thanks.

Regards,
Rinsha


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Received on Fri Mar 8 08:02:13 2013

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