[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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Mithlesh Shrivas (Core-id:R64034).......
Design Engineer.........................
Freescale Semiconductor India Pvt. Ltd..
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