USB 2.0 High-Speed 3-Port Hub Controller

 

 

 

Datasheet

 

 

 

 

BIT

 

 

 

NUMBER

BIT NAME

 

DESCRIPTION

 

 

 

3:2

BOOST_IOUT_2

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:

“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.

 

 

 

1:0

BOOST_IOUT_1

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:

“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.

 

 

 

 

4.3.1.28Register FAh: Port Swap

BIT

 

 

NUMBER

BIT NAME

DESCRIPTION

 

 

 

7:0

PRTSP

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

 

 

 

Revision 1.98 (11-19-07)

30

SMSC USB2513

 

DATASHEET