[IBIS-Users] Question

Folks,

I have quick question, has anyone here attempted to 
write. PHP wrapper for the IBIS parser? Also for 
GNUPlot?

Please advise

Thanks

Abbey
(Abdulrahman Rafiq)

Sent from my iPhone

On Mar 8, 2013, at 9:01 PM, Rinsha Reghunath <Rinsha.Raghunath@synopsys.com> wrote:

> 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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