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High Speed Inter-Chip USB 2.0 Hub and Flash Media Controller
Datasheet
SMSC USB4640/USB4640i 47 Revision 1.0 (06-01-09)
DATASHEET
8.4.4.20 F1h: Port Swap
BIT BYTE NAME DESCRIPTION
7:0 PRT_SWP 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= Controls physical port 3
Bit 2= Controls physical port 2
Bit 1= Reserved
Bit 0= Controls physical port 0