USB2514 datasheet(34/63 Pages) MICROCHIP

34 / 63 page

USB 2.0 Hi-Speed Hub Controller

Datasheet

Revision 2.2 (02-17-12)

SMSC USB251xB/xBi

DATASHEET

5.1.13

5.1.14

5.1.15

BIT

NUMBER

BIT NAME

DESCRIPTION

7:0

MAX_PWR_SP

Max Power Self-Powered: the value in 2 mA 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. The embedded peripheral

reports 0 mA in its descriptors.

Note:

The USB 2.0 Specification does not permit this value to exceed

100 mA

BIT

NUMBER

BIT NAME

DESCRIPTION

7:0

MAX_PWR_BP

Max Power Bus-Powered: the value in 2 mA 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. The embedded peripheral

reports 0 mA in its descriptors.

BIT

NUMBER

BIT NAME

DESCRIPTION

7:0

HC_MAX_C_SP

Hub Controller Max Current Self-Powered: the value in 2 mA 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

100 mA

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

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