[IBIS-Users] about Vref


Subject: [IBIS-Users] about Vref
From: Lior Aviv (RM18440@email.sps.mot.com)
Date: Tue Apr 29 2003 - 07:44:12 PDT


Hello,

I have IO that works with 3.3v +-10%.
The output resistance is 50 Ohm.
My questions are regarding the Vref parameter -
1. Who should set it and how?
2. While running the ibis checker3, I have noticed that there is a
relation
    between the Vref and the Vmeas but could not understand what does
the
    checker exactly check with these parameters.
    The warnings I get are not so clear -
    " Model 'xxx': MIN VI curves cannot drive through Vmeas=1.5V
      given load Rref=50 Ohms to Vref=zzzV ".

Thanks,
Lior Aviv,
               MSIL.

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