[SI-LIST] IBIS model problems
- From: "John Ellis" <jellis@xxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Thu, 19 Sep 2002 16:41:59 -0400
I too have seen the problems generated by many IBIS models. Recently I've
found that about half the IBIS models I try to run cannot support the
application when rwf_ramp and fwf_ramp are set to 1 or 2.
In these cases I have to fall back on the 0 setting. I think I was told
that it has to do with the frequency at which the IBIS waveforms are
derived. If someone has a more complete explanation, please share it.
While I'm on the subject, In IBIS there are multiple optional settings to
choose from which impact the nature of the waveforms. Typically when I use
an IBIS model, its one I've downloaded from a component vendor's website
because an HSPICE model wasn't available. There is usually ZERO
documentation for this model regarding what settings (rwf_ramp etc.) to use.
Does anyone who routinely builds IBIS models have any suggestions on how to
proceed in implmenting an undocumented model within a netlist so as not to
go too far afield?
Thanks,
John Ellis
TriCN, Inc.
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