[SI-LIST] Re: Looking for an algorithm to clip waveforms
- From: Vishwanath Elechithaya <elechi@xxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Fri, 28 May 2010 18:23:46 +0530
Hi Kumar,
This is not a good solution as the waveforms no more match! if I remove
the VT tables.
Regards,
elechi
On Fri, May 28, 2010 at 3:54 PM, C. Kumar <kumarchi@xxxxxxxxx> wrote:
> viswanath:
> you will save yourself lot of time by just removing the rising and falling
> wave form tables. These tables were used to represent staged switching in
> old cmos drivers.
> At DDR3 speeds they are mainly legacy.
>
> ------------------------------
> *From:* Vishwanath Elechithaya <elechi@xxxxxxxxx>
> *To:* si-list@xxxxxxxxxxxxx
> *Sent:* Fri, May 28, 2010 4:47:27 AM
> *Subject:* [SI-LIST] Looking for an algorithm to clip waveforms
>
> Hi All,
> while generating models for a fast DDR3 Cell, I came across a problem of
> over-clocked cell problem of the IBIS models not able to cope up the
> frequency requirements. I came across some topics here about the time
> shifting of the waveforms. I have tried out by manually clipping the
> waveforms so as to match the spice w.r.t IBIS, with a bit of success.
> however, the values for the clipping I am not able to put them in a
> generalized algorithm for various over-clocked models. I hope that many of
> you may have come accross this situation, and would like to know if any
> algorithm exists or innovated to actually find the amount of clipping that
> needs to be applied to the models.
> Regards,
> elechi
>
>
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