Subject: [IBIS] Operating conditions and sweep ranges
From: Gaspard Thaller (gthaller@psi-e.com)
Date: Fri Mar 07 2003 - 01:38:39 PST
Hello all,
All I/V curves of an IBIS model are generated for a given voltage swing
range, depending on the rail power supply value.
That is [-Vcc, 2Vcc] for [Pulldown] and [Pullup] tables, [Vcc, 2Vcc] for
[Power Clamp], etc...
The sweep range is defined as a single variable in s2ibis2 C source
code, and the tables are all given for the same voltage swing (mainly
based on typical voltage values), without regard to the voltage
variations due to operating conditions (min, max).
I mean you got Vcc(typ), Vcc(min), Vcc(max), it should define a
different voltage swing value for each operating condition.
What does the IBIS spec says about that?
Are all s2ibis2 simulations done with the same voltage swing values?
How are the current data gathered and grouped under the same sweep
range, when the sweep ranges are supposed to be different?
I hope I made myself clear.
Gaspard
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