USB2641 datasheet(37/60 Pages) MICROCHIP

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DS00001947C-page 37

USB2640/USB2641

7.3.5.14

EBh: Max Power For Bus-Powered Operation

7.3.5.15

ECh: Hub Controller Max Current For Self-Powered Operation

7.3.5.16

EDh: Hub Controller Max Current For Bus-Powered Operation

7.3.5.17

EEh: Power-On Time

Bit

Byte Name

Description

7:0

MAX_PWR_BP

Max Power Bus_Powered: 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, and the embedded peripheral reports 0

mA in its descriptors.

Bit

Byte Name

Description

7:0

HC_MAX_C_SP

Hub Controller Max Current Self-Powered: 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.

Bit

Byte Name

Description

7:0

HC_MAX_C_BP

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

hub consumes from an upstream port (VBUS) when operating as a bus-

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 100 mA, which is the default value.

Bit

Byte Name

Description

7:0

PWR_ON_TIME

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

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

adequate on that port. System software uses this value to determine how long

to wait before accessing a powered-on port.

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