RE: [IBIS-Users] Requesting for some help / information regarding the use of IBIS in SI simulation.

If you are using extracted RLC data to manually set up the package model
you can certainly make intelligent decisions on the topology of the
model and the distribution of the RLC parasitics. However if you are
depending on a simulator to read the data from a IBIS .pkg format file
(or the [PIN] data) and set up a model for you then your results may
differ from simulator to simulator.

-Ray
Xilinx Inc.

-----Original Message-----
From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org] On
Behalf Of Andrew Ingraham
Sent: Tuesday, May 31, 2011 4:48 PM
To: ibis-users
Subject: Re: [IBIS-Users] Requesting for some help / information
regarding the use of IBIS in SI simulation.

Yes.

I am usually tempted to start with an evenly distributed RLC model ...
unless I have reason to think that the distribution is otherwise. For
example, wirebonds might have most of the inductance and resistance,
whereas the leadframe may have more capacitance, which might influence
one to imbalance those factors unequally between die end and pin end.
But without hard data to back it up, that is just guessing.

Andy

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