USB3503 datasheet(23/73 Pages) MICROCHIP

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DS00001584B-page 23

USB3503

5.3.8

Default = 0x20h - Not a Compound Device

5.3.9

Default = 0x03h

Bit Number

Bit Name

Description

7:4

Reserved

COMPOUND

Compound Device: Allows the customer to indicate that the Hub is part of a

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

port(s) must also be defined as having a “Non-Removable 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. The following registers are used to define which ports are

enabled, and the ports are mapped as Port “n” on the hub is reported as Port

‘n’ to the host, unless one of the ports is disabled, then the higher numbered

ports are remapped in order to report contiguous port numbers to the host.

Section 5.3.11 Register 0A

Section 5.3.12 Register 0B

‘1’ = Port Re-Map mode. The mode enables remapping via the registers defined

below.

Section 5.3.38 Register FB

Section 5.3.39 Register FC

2:1

Reserved

STRING_EN

Enables String Descriptor Support

‘0’ = String Support Disabled

‘1’ = String Support Enabled

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