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

Thanks Arpad for the reply. I got my answer.

|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.

Can I use [model spec] to define my Vinl and Vinh for typ, min and max 
cases since it will give me a range for all the three cases? If yes, Can 
I use only vinh, vinl sub-parameters in [model spec] ?

With warm regards,
Mithlesh

Muranyi, Arpad wrote:

>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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