USB Hub with Integrated 10/100 Ethernet Controller

 

 

Datasheet

 

Table 3.3 Hub Configuration (continued)

 

 

 

 

EEPROM

 

 

OFFSET

DESCRIPTION

DEFAULT

 

 

 

2Ah

Port Disable (Self) Register (PDS)

30h

 

Disables 1 or more 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

 

 

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.

 

 

Bit 7 = RESERVED

 

 

Bit 6 = RESERVED

 

 

Bit 5 = RESERVED

 

 

Bit 4 = RESERVED

 

 

Bit 3 = 1; Port 3 disabled

 

 

Bit 2 = 1; Port 2 disabled

 

 

Bit 1 = 1; Port 1 disabled

 

 

Bit 0 is RESERVED, always = 0b

 

 

 

 

2Bh

Port Disable (Bus) Register (PDB)

30h

 

Disables 1 or more 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

 

 

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.

 

 

Bit 7 = RESERVED

 

 

Bit 6 = RESERVED

 

 

Bit 5 = RESERVED

 

 

Bit 4 = RESERVED

 

 

Bit 3 = 1; Port 3 disabled

 

 

Bit 2 = 1; Port 2 disabled

 

 

Bit 1 = 1; Port 1 disabled

 

 

Bit 0 is RESERVED, always = 0b

 

 

 

 

2Ch

Max Power (Self) Register (MAXPS)

01h

 

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 USB2.0 Specification does not permit this value to exceed 100mA.

 

 

 

 

2Dh

Max Power (Bus) Register (MAXPB)

00h

 

Value in 2mA increments that the Hub consumes from an upstream port (VBUS) when

 

 

operating as a bus-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.

 

 

 

 

Revision 1.0 (04-20-09)

24

SMSC LAN9512

 

DATASHEET