USB2524 datasheet(22/58 Pages) MICROCHIP

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USB2524

DS00001588B-page 22

 2013 - 2016 Microchip Technology Inc.

7.1.4.10

7.1.4.11

STRING_EN

Enables String Descriptor Support

‘0’ = String Support Disabled

‘1’ = String Support Enabled

Bit Number

Bit Name

Description

7:0

NR_DEVICE

Non-Removable Device: Indicates which port(s) include non- removable

devices. ‘0’ = port is removable, ‘1’ = port is non- removable.

Informs the Host if one of the active ports has a permanent device that is un-

detachable from the Hub. (Note: The device must provide its own descriptor

data.)

When using the internal default option, the NON_REM[1:0] pins will designate

the appropriate ports as being non- removable.

Bit 7= Reserved, always = ‘0’.

Bit 6= Reserved, always = ‘0’.

Bit 5= Reserved, always = ‘0’.

Bit 4= 1; Port 4 is disabled.

Bit 3= 1; Port 3 non-removable.

Bit 2= 1; Port 2 non-removable.

Bit 1= 1; Port 1 non-removable.

Bit 0 is Reserved, always = ‘0’.

Bit Number

Bit Name

Description

7:0

PORT_DIS_SP

Port Disable Self-Powered: Disables 1 or more contiguous ports. ‘0’ = port is

available, ‘1’ = port is disabled.

During Self-Powered operation, this selects the ports which will be

permanently disabled, and are not available to be enabled or enumerated by

a Host Controller. The disabled ports must be contiguous, and must be in

decreasing order starting with port 4.

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

appropriate ports.

Bit 7= Reserved, always = ‘0’.

Bit 6= Reserved, always = ‘0’.

Bit 5= Reserved, always = ‘0’.

Bit 4= 1; Port 4 is disabled.

Bit 3= 1; Port 3 is disabled.

Bit 2= 1; Port 2 is disabled.

Bit 1= 1; Port 1 is disabled.

Bit 0 is Reserved, always = ‘0’

Bit Number

Bit Name

Description

USB2524 数据表(PDF) 22 Page - Microchip Technology

USB2524 数据表(HTML) 22 Page - Microchip Technology

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