Teledyne LeCroy USB Chief - Users Manual - Manual (Page 113)

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Chief User’s Manual CATC Version 1.7
Chapter 11: Secondary Channel Recording
USB developers have been faced with the challenge of accurately capturing and
analyzing USB traffic on each side of the hub. Setting the triggering mechanism
to capture equal sections of USB data on both sides of the hub and attempting to
correlate the packets from these two sets of data has been an extremely
complicated but necessary task in order to analyze upstream and downstream
traffic.
The addition of a Secondary Recording Channel allows developers to record bus
traffic simultaneously on two USB branches. CATC’s USB Chief Analyzer
analyzes the traffic from both channels and presents the analysis in a unified view,
verifying that USB traffic is being routed upstream efficiently and accurately.
Peripheral developers can use Secondary Channel Recording to verify proper
operation of their designs while connected directly to the host or through a hub,
thus assisting designers in debugging their designs.
When connected and enabled, the Secondary Recording Channel taps another
USB branch and records bus traffic in the same fashion as the Primary channel.
The USB Chief then analyzes the traffic information from both channels and
allows you to manipulate the information with the same tools as those used for
single channel recordings.
To use Secondary Channel Recording, you must replace your current BusEngine
with one specialized for two channel recording (chief_s.rbf).
Note In the Secondary Recording Channel configuration, Traffic Generation is disabled
and your recording options are limited. To restore the Traffic Generation feature
and all recording options, you must return to the Secondary Recording Channel
window and select Primary to revert to the default BusEngine (chief.rbf).
To enable the Secondary Channel Recording feature, follow these steps:
Step 1 From the Setup menu, select Secondary Channel.
The Secondary Recording Channel window appears.
Step 2 Click Secondary.