[SI-LIST] Re: IBIS Model error
- From: "Chris McGrath" <chris.mcgrath@xxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Mon, 17 Nov 2003 08:29:10 -0800
Speaking of IBIS model problems...
I have a model that has a couple of odd parameters that are inconsistent
with all other models we have used.
First, in the VI curve, the falling edge "maximum" is between the
"typical" and "minimum" curves.
Second, dV/dt_r and dV/dt_f do not increase from minimimum to typical to
maximum.
In both cases when firing these drivers into test loads (PCI-X), they do
not follow the expected trend where the "maximum" settings show the
fastest rise/fall time and the "minimum" settings show the slowest
rise/fall times.
This operations seems very odd, but given my limited experience with
dissecting IBIS models I'm open to suggestions on why this component
behaves the way it does.
Thanks,
Chris
> -----Original Message-----
> From: Ingraham, Andrew [mailto:a.ingraham@xxxxxxxx]=20
> Sent: Monday, November 17, 2003 9:38 AM
> To: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] Re: IBIS Model error
>=20
>=20
> Suresh,
>=20
> All these errors point to an incorrect IBIS model. Contact=20
> IDT and ask them to fix it.
>=20
> The IBIS checker in the simulator tries to verify that the=20
> waveform data is consistent with the I-V tables. Ohm's law=20
> and the I-V tables should tell you the steady-state (initial=20
> and final) voltages, which ought to closely match those in=20
> the waveform tables. In this model, they do not come close.
>=20
> The I-V data doesn't seem to be pulling the output down. =20
> Even when driving a 50 ohm load resistor to 1.5V, the LOW=20
> state is 2.13V. Something is seriously wrong here.
>=20
> Regards,
> Andy
>=20
>=20
> ...
> > ERROR- Model IOPAD2546Z: The [Rising Waveform]
> > with [R_fixture]=3D50 Ohms and [V_fixture]=3D1.5V
> > has TYP column DC endpoints of 0.50V and 2.21v, but
> > an equivalent load applied to the model's I-V tables yields=20
> different=20
> > voltages ( 2.13V and 2.69V), a difference of 288.80% and 84.70%,=20
> > respectively.
> ...
>=20
>=20
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