[SI-LIST] Re: Four model types of "single line model" in ICM 1.0

Shawn,

Thanks for your interest in the ICM specification.  The various
ICM_model_type descriptions are described in detail on page 19 of the
ICM documentation. =20

All four of the SLM_* model types are intended to describe uncoupled or
non-coupled model data.  In these cases, only diagonal terms in the
resulting RLGC matrices would be used. =20

However, in many cases, lab or simulation data is collected for
interconnects where the effects of nearby conductors cannot be
eliminated.  SLM_even_mode, SLM_odd_mode and SLM_quiescent were created
in order to accurately describe the states of signals surrounding the
signal of interest, even though coupling would not be explicitly
described in the model. =20

In other words, though an SLM_* model does not directly describe
coupling, the SLM_* model types allow model authors to take the states
of surrounding signals into account, to more accurately include their
effects on the signal of interest in the diagonal RLGC data.

Note also that SLM_quiescent, SLM_even_mode and SLM_odd_mode are
intended for use in cases involving a defined low-loss return path.
SLM_general, though the neighboring conductors are considered
non-switching as in SLM_quiescent, is intended for cases where the
return path or reference is unknown or undefined.

I hope this helps!

- Michael Mirmak
  Intel Corp.
  Chair, EIA/IBIS Open Forum

-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of slwu
Sent: Monday, February 23, 2004 8:13 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Four model types of "single line model" in ICM 1.0

Hi All,

There are four SLM types in ICM 1.0, SLM_general, SLM_quiescent,
SLM_even_mode and SLM_odd_mode.
Does anybody know why the uncoupling single line model may be classified
like this? and when
EDA tools companys implement ICM model, is it reasonable for them not to
consider the ICM_model_type
keyword's effect to RLGC matrix or internal path topology ?. ( From my
opinions, this keyword is
necessary for ICM model's providers, since they must give the conditions
under which the RLGC data
is gathered.)

Thanks in advanced

Shawn

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