SMSC USB2512Ai Manual do Utilizador descarregar pdf (Página 22)

Industrial Temperature Rated USB 2.0 Hi-Speed 2-Port Hub Controller

Datasheet

Revision 1.97 (08-11-08) 22 SMSC USB2512Ai

DATASHEET

4.2.1.19 Register F8h: Boost_2:0

4.2.1.20 Register FAh: Port Swap

BIT

NUMBER BIT NAME DESCRIPTION

7:4 Reserved Reserved

3:2 BOOST_IOUT_2 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), 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 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), OEM should use a ‘00’ value

unless specific implementation issues require additional signal

boosting to correct for degraded USB signalling levels.

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= 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

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 36 37

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