USB82642 datasheet(33/64 Pages) MICROCHIP

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DS60001253F-page 33

USB82642

7.5.3.19

E9h: Port Disable For Bus-Powered Operation

7.5.3.20

EAh: Max Power For Self-Powered Operation

7.5.3.21

EBh: Max Power For Bus-Powered Operation

Bit

Name

Description

7:0

PORT_DIS_BP

Disables 1 or more ports.

: port is available

: port is disabled

During self-powered operation

, this register selects the ports which will be

permanently disabled. The ports are unavailable to be enabled or enumer-

ated by a host controller. The ports can be disabled in any order, the internal

logic will automatically report the correct number of enabled ports to the USB

host and will reorder the active ports in order to ensure proper function.

When using the internal default option, the PRT_DIS[1:0] pins will disable the

appropriate ports.

Bit 7 = rsvd

Bit 6 = rsvd

Bit 5 = rsvd

Bit 4 = rsvd

Bit 3 = controls physical port 3

Bit 2 = controls physical port 2

Bit 1 = controls physical port 1

Bit 0 = rsvd

Note:

Bit 1 must be set to 0 in order for the card reader to enumerate.

Bit

Name

Description

7:0

MAX_PWR_SP

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 asso-

ciated 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.

Note:

The USB 2.0 Specification [3] does not permit this value to exceed

100 mA.

Bit

Name

Description

7:0

MAX_PWR_BP

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 asso-

ciated 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.

Note:

The USB 2.0 Specification [3] does not permit this value to exceed

100 mA.

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