[SI-LIST] Re: IBIS Model error
- From: "Ingraham, Andrew" <a.ingraham@xxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Mon, 17 Nov 2003 09:37:31 -0500
Suresh,
All these errors point to an incorrect IBIS model. Contact IDT and ask them
to fix it.
The IBIS checker in the simulator tries to verify that the waveform data is
consistent with the I-V tables. Ohm's law and the I-V tables should tell
you the steady-state (initial and final) voltages, which ought to closely
match those in the waveform tables. In this model, they do not come close.
The I-V data doesn't seem to be pulling the output down. Even when driving
a 50 ohm load resistor to 1.5V, the LOW state is 2.13V. Something is
seriously wrong here.
Regards,
Andy
...
> ERROR- Model IOPAD2546Z: The [Rising Waveform]
> with [R_fixture]=50 Ohms and [V_fixture]=1.5V
> has TYP column DC endpoints of 0.50V and 2.21v, but
> an equivalent load applied to the model's I-V tables yields
> different voltages ( 2.13V and 2.69V),
> a difference of 288.80% and 84.70%, respectively.
...
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