USB4640 datasheet(45/64 Pages) SMSC

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High Speed Inter-Chip (HSIC) USB 2.0 Hub and Flash Media Controller

Datasheet

SMSC USB4640/USB4640i

Revision 1.0 (06-09-09)

DATASHEET

8.4.4.14

EBh: Max Power For Bus-Powered Operation

8.4.4.15

ECh: Hub Controller Max Current For Self-Powered Operation

8.4.4.16

EDh: Hub Controller Max Current For Bus-Powered Operation

8.4.4.17

EEh: Power-On Time

BIT

BYTE NAME

DESCRIPTION

7:0

MAX_PWR_BP

Value in 2 mA increments that the hub consumes when operating as a bus-

powered hub. This value includes the hub silicon along with the combined

power consumption 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

Value in 2 mA increments that the hub consumes when operating as a self-

powered hub. This value includes the hub silicon along with the combined

power consumption 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

Value in 2 mA increments that the hub consumes when operating as a bus-

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

power consumption 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

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. If the host requests the power-on time, the system software uses this

value to determine how long to wait before accessing a powered-on port.

USB4640 Datenblatt(PDF) 45 Page - SMSC Corporation

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