Re: [SI-LIST] : How to simulate SCSI backplane with 15 slots?

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From: Scott McMorrow (scott@vasthorizons.com)
Date: Fri Jan 12 2001 - 19:35:46 PST


John,

A different way to approach this is to perform ac frequency sweeps in
Spice. These are much faster than transient simulations. Then you can
easily build a data deck to incrementally add drives to the slots. The
frequency sweeps will help you to find resonance trends which will
aid in determining whether there is any sensitivity to certain combinations
of drives inserted in the backplane.

Resonance peaks between about 1/2 and 3X the bus frequency might
have a significant effect on the time domain waveforms. Should you find
these, then you can switch to a transient simulation to observe the
effect on overshoot, undershoot, ringing and jitter.

regards,

scott

--
Scott McMorrow
Principal Engineer
SiQual, Signal Quality Engineering
18735 SW Boones Ferry Road
Tualatin, OR  97062-3090
(503) 885-1231
http://www.siqual.com

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