Foren

www.dsprelated.com/groups/c55x/1.php

USB-Specs

www.usb.org/developers/devclass_docs/

www.usb.org/developers/devclass_docs/usbmass-ufi10.pdf

www.usb.org/developers/devclass_docs/audio10.pdf

www.usb-by-example.com/FTDI_Book_C.pdf