USB2642 datasheet(32/56 Pages) MICROCHIP

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USB2642

DS00001578C-page 32

 2014-2015 Microchip Technology Inc.

7.4.3.19

E9h: Port Disable For Bus-Powered Operation

7.4.3.20

EAh: Max Power For Self-Powered Operation

7.4.3.21

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

enumerated 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

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.

Note:

The USB 2.0 Specification (References) 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

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.

Note:

The USB 2.0 Specification does not permit this value to exceed

100 mA.

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