USB2502 datasheet(17/40 Pages) MICROCHIP

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DS000002248A-page 17

USB2502

5.2.3.6

EEPROM Offset 8(h) - Non-Removable Device

5.2.3.7

EEPROM Offset 9(h) - Port Disable For Self Powered Operation

5.2.3.8

EEPROM Offset A(h) - Port Disable For Bus Powered Operation

5.2.3.9

EEPROM Offset B(h) - Max Power For Self Powered Operation

5.2.3.10

EEPROM Offset C(h) - Max Power For Bus Powered Operation

Bit Number

Bit Name

Description

7:0

NR_DEVICE

Non-Removable Device: Indicates which port(s) include non-removable devic-

es. ‘0’ = port is removable, ‘1’ = port is non-removable.

Bit 7:3= 0; Reserved

Bit 2= 1; Port 2 non-removable.

Bit 1= 1; Port 1 non removable.

Bit 0 is Reserved, always = ‘0’.

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.

Bit 7:3= 0; Reserved

Bit 2= 1; Port 2 is disabled.

Bit 1= 1; Port 1 is disabled.

Bit 0 is Reserved, always = ‘0’

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.

Bit 7:3= 0; Reserved

Bit 2= 1; Port 2 is disabled.

Bit 1= 1; Port 1 is disabled.

Bit 0 is Reserved, always = ‘0’

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

A value of 50 (decimal) indicates 100mA.

Bit Number

Bit Name

Description

7:0

MAX_PWR_BP

Max Power Bus_Powered: 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.

A value of 50 (decimal) indicates 100mA.

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