
Bridge
5.4.5Example 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)
Keyboard EP (EP1) | Modifier Byte. | “g” Key code. | “h” Key code. |
| Right Shift Key Down | Key Down | Key Down |
“h” Key Up
“g” Key Up
“Volume + ” Key Down
“Volume + ”
Key Up
Endpoint 2, Report ID 2 =
Multimedia keys
CY4672 Reference Design Guide, Document # | 97 |
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