Re: Ibis standard for feedback

From: Sergey Sofer <Sergey.Sofer@motorola.com>
Date: Mon Jul 09 2001 - 05:46:52 PDT

Hello Bob,

The method specified by Yoked is a kind of model selecting
method, where the control for driving strong or less strong,
comes from pad itself as specific voltage level.

We saw that there is an option to take care on IO buffer with
different driving models connected in parallel, with "model
selector" in the last version of IBIS (3.2).

The Yoked's question may be asked in other words:
Is there any possibility to select models by pad's voltage level?

Regards,
Sergey.
 

Bob Ross wrote:

Hello Yoked:

I am not familiar with the specific technical
details regarding the feedback method.  However,
I believe IBIS would not handle it now, but the
future IBIS-X macro language would be able to
describe such a buffer.

Bob Ross
Mentor Graphics

> "Yoked Erlich (r58559)" wrote:
>
> Hi ,
>
> As I've seen in 'IBIS forum I/O buffer modeling cookbook - revision 2.0x'
> paper
> there are four main different I/O buffers (3-state,input buffer,output
> buffer,open drain buffer),
> Is there any specification for buffer that using feedback method in order to
> reduce noises?
>
> Thanks
>
> Yoked.
>
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  Received on Mon Jul 9 05:47:07 2001