USB2513 SMSC Corporation, USB2513 Datasheet - Page 30

• Manufacturer Part Number: USB2513
• Description: USB 2.0 High-Speed 3-Port Hub Controller
• Manufacturer: SMSC Corporation

Revision 1.98 (11-19-07)
4.3.1.28
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
Upstream 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:
Upstream 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= ‘1’; Port 3 DP/DM is Swapped.
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
30
DESCRIPTION
DESCRIPTION
USB 2.0 High-Speed 3-Port Hub Controller
SMSC USB2513
Datasheet