SMSC USB2640i - Manual (Page 44)

Ultra Fast USB 2.0 Multi-Format Flash Media Controller/USB Hub Combo
Revision 2.0 (10-03-08) 44 SMSC USB2640/USB2641
DATASHEET
7.3.3.30 F1h: Port Swap
BIT
NUMBER BYTE NAME DESCRIPTION
7:0 PRT_SWP Port Swap: Swaps the Upstream and Downstream USB DP and DM Pins for
ease of board routing to devices and connectors.
‘0’ = USB D+ functionality is associated with the DP pin and D- functionality
is associated with the DM pin.
‘1’ = USB D+ functionality is associated with the DM pin and D- functionality
is associated with the DP pin.
Bit 7= Reserved
Bit 6= Reserved
Bit 5= Reserved
Bit 4= Reserved
Bit 3= ‘1’; Port 3 DP/DM is swapped
Bit 2= ‘1’; Port 2 DP/DM is swapped
Bit 1= Reserved
Bit 0= ‘1’:Upstream Port DP/DM is swapped