Philips Semiconductors

Product specification

PDIUSBH11

Universal Serial Bus Hub

1997 Aug 01

8

COMMAND DESCRIPTIONS

Command Procedure

There are four basic types of commands: Initialization, Data, Hub Specific and General commands. Respectively, these are used to initialize the

hub and embedded function; for data flow between the hub, embedded function and the host; some hub specific commands for controlling

individual downstream ports; and some general commands.

Initialization Commands

Initialization commands are used during the enumeration process of the USB network. These commands are used to enable the hub and

embedded function endpoints. They are also used to set the USB assigned address.

Set Address / Enable

Command

: D0h (Hub), D1h (Embedded Function)

Data

: Write 1 byte

This command is used to set the USB assigned address and enable the hub or embedded function respectively. The hub always powers up

disabled and should be enabled after a bus RESET.

0

7

0

6

0

5

0

4

0

3

0

2

0

1

0

0

POWER ON VALUE

ADDRESS

ENABLE

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ADDRESS

THE VALUE WRITTEN BECOMES THE ADDRESS

ENABLE

A ‘1’ ENABLES THIS FUNCTION

Set Endpoint Enable

Command

: D8h

Data

: Write 1 byte

Interrupt endpoints can only be enabled when the hub/function is enabled via the Set Address/Enable command.

X

7

X

6

X

5

X

4

X

3

X

2

0

1

0

0

POWER ON VALUE

HUB’S INTERRUPT ENDPOINT

FUNCTION’S INTERRUPT ENDPOINT

RESERVED

HUB’S INTERRUPT ENDPOINT

A VALUE OF ‘1’ INDICATES THE HUB’S INTERRUPT ENDPOINT IS ENABLED.

FUNCTION’S INTERRUPT ENDPOINT

A VALUE OF ‘1’ INDICATES THE EMBEDDED FUNCTION’S INTERRUPT ENDPOINT IS ENABLED.

SV00387