USB5533B datasheet(31/71 Pages) MICROCHIP

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 2012 - 2015 Microchip Technology Inc.

DS00001680C-page 31

USB5533B

5.5.4

SPECIAL HUB COMMANDS

Below is a list of the extended commands and the code used to execute them.

The extended commands provide access to the status of the device. From these registers a SMBus controller can see

the connection status of the hub, communicate with the UCS1000, and change the SMBus address if desired. When

the extended command is sent the hub will interpret the memory starting at offset 00h as follows:

TABLE 5-1:

SPECIAL SMBUS COMMANDS

Operation

OPCODE

Description

Reboot

9936h

Reboot internal MCU.

Configuration Register

Access

9937h

Read and Write Configuration Registers

Extended Command

993Eh

Execute Extended Status Commands

USB Attach

AA55h

Enter Configuration Stage

USB Attach with SMBus

Access

AA56h

Enter Configuration Stage with SMBus Access Enabled

TABLE 5-2:

EXTENDED COMMANDS

Command

Code

Set Address

00h

Get Default Address

01h

Get Hub Info

02h

Get UCS Port Mask

03h

Port Connect Status

80h

Port Power Status

81h

Port Force Disable

82h

Port DP/DM Status

83h

UCS Byte Read

84h

UCS Byte Write

85h

UCS Block Read

86h

UCS Block Write

87h

TABLE 5-3:

MEMORY FORMAT FOR EXTENDED HUB COMMAND

RAM Address

Description

Notes

0000h

Command

Code of the extended command to execute.

0001h

Status

Always write 0 to this register, it will be updated after the command is exe-

cuted with the status.

0002h

Data1

The first byte of data to write to or read from when executing the command.

...

0004h+N

DataN

The Nth byte of data to write to or read from when executing the command.

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