comments on BIRD 6.1

Hi Bob Ross,
        I have read thru your BIRD 6.1 and have also seen some of the comments
        from other fellow IBIS members. Overall it looks good.

        One thing I want to be clear about is [Diff_Pin] and inv_pin are for
        a Differential receivers input pins and in that case vdiff is the
        peak-to-peak voltage of the receiver inputs.

        vdiff can also be the differential output of a driver. In that case it
        is assiged 0V(differential not ground-just as your note says). 0 volts
        differential shows only the cross over points of the driver outputs.

        I know we only talk about skews but can Differential Prop delay be
        measured thru the simulators. For example, for the driver this would
        mean the delay from 1.5V(input) to the 0v(differntial output).

        Also, last point, us semiconductor vendors do an extensive characterization
        on each device across Vcc, temp, process corners and package types to
        gather data. We do not base our simulations on datasheet numbers only.
        Thanks Will for pointing that out too.

        If we create IBIS files, our data will be based on the above mentioned.

Regards,
Syed.
Received on Mon Jan 31 16:56:27 1994