RE: [IBIS] query on modelling of diff pin for programmable buffers!

Mithlesh,

I can't think of a better way than using a comment character
with the [Diff Pin] keyword.  I know this is not optimal, but
we can't make the [Diff Pin] part of the [Model Selector],
which seems to be what you really would need for your receiver.

For the internal reference case, you could get by with making
the model as if it was single ended, and define the Vinh and
Vinl values around the internally generated reference voltage.

Arpad Muranyi
Intel Corporation
===============================================================

-----Original Message-----
From: owner-ibis@eda.org [mailto:owner-ibis@eda.org] On Behalf Of Mithlesh Shrivas
Sent: Monday, February 14, 2005 10:01 PM
To: ibis
Cc: ibis-users
Subject: [IBIS] query on modelling of diff pin for programmable buffers!

Hi,

I am working on writing ibis model for a programmable I/O buffer which 
can be programmed to work both as cmos input and differential input. If 
I model it as diff pin, it will always be treated as differential input 
even if programmed for cmos input. So, I am not able to understand how 
to model it. This buffer is always cmos output.

Also, this buffer can be programmed to have an internal reference as 
inverting input. So, there may not be a pin on package which acts as 
inverting pin. In this case what do I declare as inverting pin?

It will help me a lot if you could respond and explain with an example.

Warm Regards,
Mithlesh

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