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Undocument USB Registers

Other Parts Discussed in Thread: OMAP-L138, OMAP-L137

I have ported the Starterware USB CDC Device example to the OMAP-L137/C6747 EVM. It seems to work but I am wondering about the driver file usb.c accessing undocumented registers in the USB OTG controller. These registers have the names EPCISC, IDVISC, EPCIM, VDC, EPC, DMASEL and GPCS. These are not in the OMAP-L137 or OMAP-L138 TRM. Are these "real" registers or is the driver just writing to nothing?

StarterWare Version 1_20_03_03 for C6748.