USB2512A Standard Microsystems Corp., USB2512A Datasheet - Page 22

• Manufacturer Part Number: USB2512A
• Description: Usb2512a Usb 2.0 High-speed 2-port Hub Controller
• Manufacturer: Standard Microsystems Corp.

Revision 1.96 (07-11-08)
4.2.1.20
NUMBER
NUMBER
BIT
BIT
3:2
1:0
7:0
Register FAh: Port Swap
BOOST_IOUT_2
BOOST_IOUT_1
BIT NAME
BIT NAME
PRTSP
USB electrical signaling drive strength Boost Bit for Downstream Port ‘2’.
‘00’ = Normal electrical drive strength = No boost
‘01’ = Elevated electrical drive strength = Low (approximately 4% boost)
‘10’ = Elevated electrical drive strength = Medium (approximately 8% boost)
‘11’ = Elevated electrical drive strength = High (approximately 12% boost)
Note:
USB electrical signaling drive strength Boost Bit for Downstream Port ‘1’.
‘00’ = Normal electrical drive strength = No boost
‘01’ = Elevated electrical drive strength = Low (approximately 4% boost)
‘10’ = Elevated electrical drive strength = Medium (approximately 8% boost)
‘11’ = Elevated electrical drive strength = High (approximately 12% boost)
Note:
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= Reserved
Bit 2= ‘1’; Port 2 DP/DM is Swapped.
Bit 1= ‘1’: Port 1 DP/DM is Swapped.
Bit 0= ‘1’:Upstream Port DP/DM is Swapped
“Boost” could result in non-USB Compliant parameters (one
example would be Test J/K levels), the OEM should use a 00 value
unless specific implementation issues require additional signal
boosting to correct for degraded USB signalling levels.
“Boost” could result in non-USB Compliant parameters (one
example would be Test J/K levels), the OEM should use a 00 value
unless specific implementation issues require additional signal
boosting to correct for degraded USB signalling levels.
DATASHEET
22
DESCRIPTION
DESCRIPTION
USB 2.0 Hi-Speed 2-Port Hub Controller
SMSC USB2512A
Datasheet