USB MultiSwitchTM Hub

Datasheet

7.1.4.11Register 0Ah: Port Disable For Self Powered Operation (Reset = 0x00)

BIT

 

 

 

NUMBER

BIT NAME

 

DESCRIPTION

 

 

 

7:0

PORT_DIS_SP

Port Disable Self-Powered: Disables 1 or more contiguous ports. ‘0’ = port is

 

 

available, ‘1’ = port is disabled.

 

 

During Self-Powered operation, this selects the ports which will be permanently

 

 

disabled, and are not available to be enabled or enumerated by a Host

 

 

Controller. The disabled ports must be contiguous, and must be in decreasing

 

 

order starting with port 4.

 

 

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

 

 

appropriate ports.

 

 

Bit 7= Reserved, always = ‘0’.

 

 

Bit 6= Reserved, always = ‘0’.

 

 

Bit 5= Reserved, always = ‘0’.

 

 

Bit 4= 1; Port 4

is disabled.

 

 

Bit 3= 1; Port 3

is disabled.

 

 

Bit 2= 1; Port 2

is disabled.

 

 

Bit 1= 1; Port 1

is disabled.

 

 

Bit 0 is Reserved, always = ‘0’

7.1.4.12Register 0Bh: Port Disable For Bus Powered Operation (Reset = 0x00)

BIT

 

 

 

NUMBER

BIT NAME

 

DESCRIPTION

 

 

 

7:0

PORT_DIS_BP

Port Disable Bus-Powered: Disables 1 or more contiguous ports. ‘0’ = port is

 

 

available, ‘1’ = port is disabled.

 

 

During Bus-Powered operation, this selects the ports which will be permanently

 

 

disabled, and are not available to be enabled or enumerated by a Host

 

 

Controller. The disabled ports must be contiguous, and must be in decreasing

 

 

order starting with port 4.

 

 

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

 

 

appropriate ports.

 

 

Bit 7= Reserved, always = ‘0’.

 

 

Bit 6= Reserved, always = ‘0’.

 

 

Bit 5= Reserved, always = ‘0’.

 

 

Bit 4= 1; Port 4

is disabled.

 

 

Bit 3= 1; Port 3

is disabled.

 

 

Bit 2= 1; Port 2

is disabled.

 

 

Bit 1= 1; Port 1

is disabled.

 

 

Bit 0 is Reserved, always = ‘0’

7.1.4.13Register 0Ch: Max Power For Self Powered Operation (Reset = 0x00)

BIT

 

 

NUMBER

BIT NAME

DESCRIPTION

 

 

 

7:0

MAX_PWR_SP

Max Power Self_Powered: Value in 2mA increments that the Hub consumes

 

 

from an upstream port (VBUS) when operating as a self-powered hub. This

 

 

value includes the hub silicon along with the combined power consumption

 

 

(from VBUS) 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 0mA

 

 

in its descriptors.

 

 

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

 

 

100mA

Revision 1.91 (08-22-07)

26

SMSC USB2524

 

DATASHEET