[SI-LIST] measuring final settle time in HSPICE
- From: Mike LaBonte <mike@xxxxxxxxxxx>
- To: si_list <si-list@xxxxxxxxxxxxx>
- Date: Mon, 24 Sep 2001 16:00:36 -0400
When performing a setup time check it is necessary to use the latest
time that the data signal becomes stable. On a low to high transition,
for example, this is conventionally the last time where the received
signal rises above Vinh and stays above. In the best case this will be
the first crossing. But ringing may necessitate 2 or more crossings
before the signal becomes stable enough to be latched.
How does one automate the measurement of this final settle time value in
HSPICE? The .measure statement lets you find the LAST crossing time for
a signal, but the time at which HSPICE begins to count data crossings is
either a fixed time value, or it is triggered by another signal. The
trigger signal could almost be the clock, but that signal obviously
changes too late to be the trigger. Has anyone found a convenient method
for automating these measurements?
Mike LaBonte
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