USB2640I datasheet(35/59 Pages) MICROCHIP

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DS00001948C-page 35

USB2640i/USB2641i

7.3.5.11

E8h: Port Disable For Self-Powered Operation

7.3.5.12

E9h: Port Disable For Bus-Powered Operation

7.3.5.13

EAh: Max Power For Self-Powered Operation

Bit

Byte Name

Description

7:0

PORT_DIS_SP

Disables 1 or more ports.

‘0’ = Port is available

‘1’ = 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 since 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.

Bit 7= Reserved

Bit 6= Reserved

Bit 5= Reserved

Bit 4= Reserved

Bit 3= Controls physical port 3

Bit 2= Controls physical port 2

Bit 1= Controls physical port 1

Bit 0= Reserved, always = ‘0’

Bit

Byte Name

Description

7:0

PORT_DIS_BP

Disables 1 or more ports.

‘0’ = Port is available

‘1’ = 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= Reserved

Bit 6= Reserved

Bit 5= Reserved

Bit 4= Reserved

Bit 3= Controls physical port 3

Bit 2= Controls physical port 2

Bit 1= Controls physical port 1

Bit 0 is Reserved, always = ‘0’

Bit

Byte Name

Description

7:0

MAX_PWR_SP

Max Power 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 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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