[SI-LIST] Re: Where are IBIS models with SSO support ?
- From: "Sam Chitwood" <samchitwood@xxxxxxxxxxx>
- To: "'David Lieby'" <dlieby@xxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Wed, 14 Jan 2009 01:54:05 -0600
Hi everyone,
David may be referring to my original BIRD95 case study presentation:
http://www.vhdl.org/pub/ibis/summits/jan05/chitwood.pdf
(Thanks David for the nice comments!)
A follow-up SSO study on IBIS package model choices and example
effectiveness of PCB decoupling:
http://www.vhdl.org/pub/ibis/summits/oct06b/chitwood.pdf
And finally, a thorough discussion of how to build the best possible IBIS
package models for SSO applications:
http://www.vhdl.org/pub/ibis/summits/feb08/chitwood.pdf
And remember to ask the silicon vendor for the die PDS capacitance... :-)
Thanks,
Sam
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of David Lieby
Sent: Tuesday, January 13, 2009 4:27 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Where are IBIS models with SSO support ?
Several years ago I saw a paper by someone (I have forgotten the name of the
author) that detailed the use of IBIS files in HSPICE to get an idea of SSO
in a system. The system is set up to use the current output and timing from
the IBIS file, along with some extrapolation for cross current, to get a
result of the current usage of a switching output. Then several of them are
fed from a power bus with a feed that is set up to look like several
adjacent power/ground connections to the board.
Yes, there are a lot of people who are taken aback by this approach. On the
other hand, once you go through the exercise and calibrate the results
across at least one existing system (lab measurements, ghastly), you have
something that is within 10 percent of what you really will see when the
system is built. It does take time and no one else will do the work or
figure out what you really want.
I kept a whole group of hardware engineers happy with this approach and the
results with real systems.
Cheers,
dav0
David Lieby
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