[SI-LIST] Re: different Vmeas for Rising/Falling
- From: "Jon Powell" <jonpowell@xxxxxxxxxxxx>
- To: <diggidydog2003@xxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Tue, 8 Apr 2003 09:01:51 -0700
I think that this is a very tool centric thing.
You are making timing measurements and not effecting the SI of
the waveform and different tools provide different ways to make those
measurements. In XTK, for instance, you don't really specify the Vmeas at
all but the actual delay time you want to use (which we called TIME TO VM)
and I am sure other tools have a similar function.
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of SI Eng
Sent: Tuesday, April 08, 2003 8:52 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] different Vmeas for Rising/Falling
Gurus :
I'm wondering how to account for different Vmeas
points for Falling vs. Rising edges when doing timing
calculations. IBIS only specifies a single Vmeas
point, and ICX doesn't provide an extension for this.
I don't know about XTK or the other tools.
The SI tools will report delays based upon the
worst-case for Rising and Falling edges referenced to
the same Vmeas point. This result is incorrect for the
edge with the wrong Vmeas.
Does the measurement have to be done manually in this
case (i.e waveform delta) ?
Thanks,
Douglas
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