High Speed Inter-Chip USB 2.0 Hub and Flash Media Controller

 

 

Datasheet

8.4.4.11

E8h: Port Disable For Self-Powered Operation

 

 

 

BIT

BYTE NAME

DESCRIPTION

 

 

 

7:0

PORT_DIS_SP

Disables 1 or more ports.

 

 

‘0’ = Port is available

 

 

‘1’ = Port is disabled

 

 

During self-powered operation this register selects the ports which will be

 

 

permanently disabled. The ports are unavailable to be enabled or

 

 

enumerated by a host controller. The ports can be disabled in any order

 

 

since the internal logic will automatically report the correct number of

 

 

enabled ports to the USB host and will reorder the active ports in order to

 

 

ensure proper function.

 

 

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= Controls physical port 1

 

 

Bit 0= Reserved

 

 

 

8.4.4.12E9h: Port Disable For Bus-Powered Operation

BIT

BYTE NAME

DESCRIPTION

 

 

 

7:0

PORT_DIS_BP

Disables 1 or more ports.

 

 

‘0’ = Port is available

 

 

‘1’ = Port is disabled

 

 

During self-powered operation, this register selects the ports which will be

 

 

permanently disabled. The ports are unavailable to be enabled or

 

 

enumerated by a host controller. The ports can be disabled in any order, the

 

 

internal logic will automatically report the correct number of enabled ports to

 

 

the USB host and will reorder the active ports in order to ensure proper

 

 

function.

 

 

When using the internal default option, the PRT_DIS[1:0] pins will disable the

 

 

appropriate ports.

 

 

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= Controls physical port 1

 

 

Bit 0 is Reserved

 

 

 

8.4.4.13EAh: Max Power For Self-Powered Operation

BIT

BYTE NAME

DESCRIPTION

 

 

 

 

7:0

MAX_PWR_SP

Value in 2 mA increments that the hub consumes when operating as a self-

 

 

powered hub. This value includes the hub silicon along with the combined

 

 

power consumption of all associated circuitry on the board. This value also

 

 

includes the power consumption of a permanently attached peripheral if the

 

 

hub is configured as a compound device, and the embedded peripheral

 

 

reports 0 mA in its descriptors.

 

 

 

Note: The USB 2.0 Specification does not permit this value to exceed 100

 

 

mA.

 

 

 

 

 

Revision 1.0 (06-01-09)

44

SMSC USB4640/USB4640i

DATASHEET