LeCroy Advisor, User Manual, Page: 129 / 174

USB Advisor User Manual Chapter 11: Recording Options
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Frame Patterns
Select Frame Patterns under Event Groups to display the Frame Patterns window:
Identify frame patterns you want either to filter out of a Trace View or to use as a Trigger.
You can select either
All Start of Frame packets (SOF) to be filtered out or specify the
Frame Number of a frame to trigger on.
Note: Do not filter Start of Frame (SOF) packets if you will use Transfer or other
higher level decoding of the trace or require accurate Data Toggle error analysis.
The software depends on the existence of SOF packets when it analyzes these (and
other) sequences in the USB packet stream.
Device Requests
Select Device Requests under Event Groups to display the Device Requests window:
You can select one or two Device Requests for triggering or filtering.