RE: [IBIS-Users] Vinl and Vinh For Differential Input Model

From: Muranyi, Arpad <arpad.muranyi_at_.....> Date: Fri Mar 04 2005 - 13:58:14 PST · This archive was generated by hypermail 2.1.8 : Fri Mar 04 2005 - 13:59:42 PST

This look like that the parser doesn't check that the [Model]
is used as a differential pair, and issues a warning regardless.
Keep in mind that the same [Model] can be referenced as a single
ended buffer as well as part of a differential pair.

However, this is only a warning, and if you are aware of the
rules that the vdiff value overrides the Vinh and Vinl parameters
you can rest in piece that there is nothing wrong with your model.

Arpad Muranyi
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-----Original Message-----
From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org] On Behalf Of lee yang
Sent: Friday, March 04, 2005 6:40 AM
To: ibis-users@eda.org
Subject: [IBIS-Users] Vinl and Vinh For Differential Input Model

Hi IBIS experts,

As far i as concern, the differential input does not base on the Vinl and 
Vinh to determine the voltage level but based on the difference between 
posite and negative pins.
I am wondering that I got the warning if i did not put the vinl and vinh 
values for diffrentil LVDS input model in an IBIS file. Why should we put 
the values? And how can we determine the Vinl and Vinh values for LVDS or 
any other differential input standards (since we only talking about Vid and 
Vicm most of the time)?
Thanks a lot.

-Lee

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