USB2524 datasheet(21/58 Pages) MICROCHIP

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DS00001588B-page 21

USB2524

7.1.4.9

COMPOUND

Compound Device: Allows the OEM 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”.

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.

2:1

Reserved

Reserved, always = ‘0’.

BOOST_IOUT

Upstream USB electrical signaling drive strength Boost Bit.

Note:

This is used for long-trace length designs where additional electri-

cal signal boost may be required to support standard USB signal

levels at the far end of a cable.

‘0’ = Normal electrical drive strength.

‘1’ = Elevated electrical drive strength.

Bit Number

Bit Name

Description

7:6

PRT_ASSIGN_MOD

Port Assignment Interface Mode:

‘00’ = Port Assign Interface is configured for Programmable Mode (8

configurations) (3-wire)

‘01’ = Port Assign Interface is configured for Direct Port Control. (4-Wire),

Level Sensitive.

‘10’ = Port Assign Interface is configured for Direct Port Control. (4-Wire),

edge Sensitive, and Unassigned state is not supported.

‘11’ = Port Assign Interface is configured for Direct Port Control. (4-Wire),

edge Sensitive, and the Unassigned state is supported.

PRT_ASSIGN_CFG

Port Assignment Configuration:

‘0’ = Port assignment is controlled by hardware interface pins

‘1’ = Port assignment is controlled by:

PORT_ASSIGN_12

PORT_ASSIGN_34

PORT_ASSIGN_56

PORT_ASSIGN_73333

4:3

Reserved

Reserved, always = ‘0’.3

2:1

LED_MODE

LED Mode Selection: The LED_A[4:1]_N and LED_B[4:1]_N pins support

several different modes of operation (depending upon OEM implementation of

the LED circuit).

‘00’ = USB Mode, (see USB Mode on page 40 for description)

‘01’ = Host Ownership and Port Speed LED indicator, (see Host Ownership

and Port Speed LED Indication on page 40 for description)

‘10’ = Basic Host Ownership LED indicator, (see Basic Host Owner LED

Indication on page 40 for description)

‘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!

Bit Number

Bit Name

Description

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