Subject: RE: SPECCTRAQuest timing measurement
From: John Horner (horner@cadence.com)
Date: Fri Jan 25 2002 - 06:09:42 PST
Matt,
You can get the behavior you are looking for by using the buffer delay "on the fly" measurement, and the standard "measure at input thresholds". When you use on the fly measurement, the measurement waveforms are generated for:
1) The driver into the circuit being driven
2) The waveform of the driver into the test fixture (seen as driver-bufdelay in the waveforms)
3) All the receivers.
Look for buffer delay in the help documentation, it explains it pretty well.
Regards,
John Horner
-----Original Message-----
From: ruston, matt [mailto:ruston_matt@emc.com]
Sent: Thursday, January 24, 2002 3:35 PM
To: ibis-users@eda.org
Subject: SpectraQuest timing measurement
All:
Hi. I have a specific question regarding SPECCTRAQUEST SigXplorer. Under
analysis/measurement modes, they give me the option to "measure delays at"
either Input Thresholds or Vmeasure.
It seems to me that I want a hybrid of these two options. I want to measure
the driver output at the Vmeasure point of the driver to correlate to
standard load timing. I then want to use the Input threshold of the receiver
(either Vil or Vih, depending on low-to-high or high-to-low transition).
Am I mis-reading what my options are? Does what I want make sense? Any and
all thoughts and experiences are welcome.
Regards,
Matt
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