[SI-LIST] : How are Switch Groups and Series Switch models used?

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From: Kim Helliwell (khelliwe@acuson.com)
Date: Mon Nov 13 2000 - 16:36:26 PST


I'm trying to set up a model to use [Series Switch Groups] and [Series Pin Mapping]
and associated keywords to model a 12-bit 1-of-2 mux/demux chip. The chips connects
the A-inputs to either of 2 B-outputs. I'm having trouble visualizing how to
set up the series switch groups to accomplish the simple rule that only one of
the two states can be "on" at a time. Should I do something like:

On 1 /
Off 2 /

???

I'm also puzzled as to what the "1" and "2" mean: are they just some convenient names,
or to they actually refer to control pins? The examples in the IBIS spec lead me
to believe the former, but the text does not come right out and say so.

-- 
Kim Helliwell
Senior CAE Engineer
Acuson Corporation
Phone: 650 694 5030  FAX: 650 943 7260

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