[SI-LIST] Re: Tools to Create IBIS Models
- From: MikonCons@xxxxxxx
- To: si-list@xxxxxxxxxxxxx
- Date: Sun, 21 Mar 2004 16:35:44 EST
Good comment, Andy. I totally agree.
I presented one paper at DesignCon 2004 this year on the use of Laplacian
based Coupled T-line models (in SPICE format) that was well received; however,
another paper I submitted on converting IBIS model data to SPICE models was
rejected. My conversion technique added dynamic conversion of driver output
capcitance and receiver input capacitance as a function of the instantaneous
T-line
voltage, which is more accurate than the current IBIS model format. I also
allowed coupled package leads and I/O intefaces to be easily incorporated into
the model. Further, the conversion process identifies when a published IBIS
model is deficient or inconsistent.
I have had independent reviewers indicate the paper as a major step forward;
however, I suspect the rejection was because there are many IBIS model (and
EDA) vendors who financially support the conference that would have been
displeased with the paper. That is, it was not "politically correct." I am
considering submitting the paper to a magazine, but they have the same EDA
vendor (paid
advertising) barrier.
If one can afford the time to run SPICE models, do it. If time-to-market is
so critical that minutes or hours of schedule are detrimental, one may opt to
take chances with IBIS models and cross their fingers. If a company chooses to
publish IBIS models instead of SPICE models, they need to do a thorough and
accurate job of it to gain respect. The option is to require a non-disclosure
agreement for SPICE models instead.
I haven't the time for another lengthy thread of comments, so I hope this
note doesn't ruffle too many feathers.
Mike
Michael L. Conn
Owner/Principal Consultant
Mikon Consulting
Cell: 408-821-9843
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