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CY4672 Reference Design Guide, Document # 001-16968 Revision ** 97
Bridge
5.4.5 Example USB Bus Analyzer (CATC) Traces
Figure 5-17 below shows the USB data transmissions between the bridge and the host PC captured
with the USB CATC Bus Analyzer. In this example, the Right Shift + ‘g’, ‘h’ keys were typed followed
by the ‘Volume Up’, ‘Volume Down’ keys. Note the keyboard regular key reports are sent to the PC
via the endpoint 1 while the Multimedia key reports are sent via the endpoint 2 with Report ID 2.
Figure 5-17. Example keyboard CATC Trace (Standard and MM Keys)
Modifier Byte.
Right Shift Key Down
“g” Key code.
Key Down
“h” Key code.
Key Down
“h” Key Up
“g” Key Up
Keyboard EP (EP1)
Endpoint 2, Report ID 2 =
Multimedia keys
“Volume + ”
Key Down
“Volume + ”
Key Up
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