USB2502-HT datasheet(31/44 Pages) SMSC

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2-Port USB 2.0 Hub Controller

Datasheet

SMSC USB2502

Revision 2.1 (12-06-06)

DATASHEET

5.3.9.14

5.3.9.15

5.3.9.16

5.3.9.17

5.3.9.18

Undefined Registers

The registers shown in Table 5.4 are the defined registers in the Hub. Reads to undefined registers

return 00h. Writes to undefined registers have no effect and do not return an error.

BIT

NUMBER

BIT NAME

DESCRIPTION

7:0

MAX_PWR_BP

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.

A value of 50 (decimal) indicates 100mA.

BIT

NUMBER

BIT NAME

DESCRIPTION

7:0

HC_MAX_C_SP

Hub Controller Max Current 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 does NOT include the power consumption of a permanently

attached peripheral if the hub is configured as a compound device.

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

100mA

A value of 50 (decimal) indicates 100mA, which is the default value.

BIT

NUMBER

BIT NAME

DESCRIPTION

7:0

HC_MAX_C_BP

Hub Controller Max Current Self-Powered: Value in 2mA increments that the

Hub consumes from an upstream port (VBUS) when operating as a self-

powered hub. This value will include the hub silicon along with the combined

power consumption (from VBUS) of all associated circuitry on the board.

This value will NOT include the power consumption of a permanently

attached peripheral if the hub is configured as a compound device.

A value of 50 (decimal) would indicate 100mA, which is the default value.

BIT

NUMBER

BIT NAME

DESCRIPTION

7:0

POWER_ON_TIME

Power On Time: The length of time that is takes (in 2 ms intervals) from the

time the host initiated power-on sequence begins on a port until power is

good on that port.

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