Re: [IBIS-Users]

Vinayak,
   The IBIS standard itself doesn't allow for any kind of feedback
modeling of slew rate control. I forget the exact IBIS version, but
either 4.0, 4.2 or 5.0 allows for the inclusion of verilog-A models
which can be written to model this behavior.

Ghatawade, Vinayak wrote:
> All,
>
>
>
> This has been discussed previously in this forum on modeling Adaptive
> feedback buffers.
>
> Is there anyway we can model adaptive feedback buffer which depends on
> the PAD voltage and inturn switches on pmos/nmos depending on external
> loading condition.
>
>
>
> I tried looking at few of the options like driver schedule but since
> these are timing related I cannot use for my case since in my case the
> buffer
>
> Adjust the slews based on PAD voltage and not with respect to the time
> (delayed turn on). Also if I want to model the PAD dependency in time
> domain this will be very
>
> Specific to a loading condition. Since IBIS modeling can be done using
> R_load only we cannot make sure this approach can work across different
> user conditions (tline, loading etc).
>
>
>
> Do you have any other suggestion to model a buffer with PAD feedback.
>
>
>
> Thanks
>
> vinayak
>
>
>
>
>
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>
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-- 
John Phillippe
MSG, I/O Pad Design
Freescale  - 512-895-1835
Austin, TX - john.phillippe@freescale.com
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