USB2517 datasheet(25/58 Pages) MICROCHIP

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 2013-2016 Microchip Technology Inc.

DS00001598B-page 25

USB2517/USB2517I

7.2.1.9

COMPOUND

Compound Device: Allows the OEM to indicate that the Hub is part of a com-

pound (see the USB Specification for definition) device. The applicable

port(s) must also be defined as having a "Non-Removable Device".

Note:

When configured via strapping options, declaring a port as non-

removable automatically causes the hub controller to report that it

is part of a compound device.

0 = No

1 = Yes, Hub is part of a compound device

2:0

Reserved

Bit

Number

Bit Name

Description

7:4

Reserved

PRTMAP_EN

Port Re-mapping enable: Selects the method used by the hub to assign port

numbers and disable ports.

‘0’ = Standard Mode

‘1’ = Port Re-map mode

2:1

LED_MODE

LED Mode Selection: The LED_A[47:1]_N and LED_B[47:1]_N pins support

several different modes of operation.

‘00’ = USB Mode

‘01’ = Speed Indication Mode

‘10’ = Same as ‘00’, USB Mode

‘11’ = Same as ‘00’, USB Mode

Warning: Do not enable an LED mode that requires LED pins that are not

available in the specific package being used in the implementation!

Note:

The Hub will only report that it supports LED's to the host when

USB mode is selected. All other modes will be reported as No LED

Support.

STRING_EN

Enables String Descriptor Support

‘0’ = String Support Disabled

‘1’ = String Support Enabled

Bit

Number

Bit Name

Description

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