[ 1] Compag, Hewlet-t Packard, Intel, et al . Universal Serial Bus Specification Revision 210 [ DB/ OL] . http: / / www. usb. org/ deve-lopers/ docs/ usb- 20. zip, 2002- 12- 21/ 2003- 08.
[ 2] Intel Corporation. USB 210 Transceiver Macrocell Interface Specification Version 1105 [ DB/ OL] . http: / / www. intel. com/ techno-logy/ usb/ download/ 2- 0- Xcvr- Macrocell1 - - 05. pdf, 2001- 03- 29/ 2003- 08.
[ 3] Agere Systems Inc Semiconductors. USS2x1 Data Sheet [ DB/ OL] . http: / /www. agere. com/ client/ docs/ PB00029- 5. pdf, 2002- 10/ 2003- 08.
[ 4] Rudolf Usselmann. USB Function IP Core Rev 11 5 [ DB/ OL] . http: / / www. opencores. org, 2002- 01/ 2003- 08.
[ 5] Xilinx Inc. ISE 4 User Guide [ DB/ OL] . http: / / www. xilinx. com/ support/ sw- manuals/ xilinx6/ index- htm, 2001/ 2003- 08.