2-Port SS/HS USB Hub Controller

Datasheet

Revision 1.2 (05-31-13)

16

SMSC USB5532B

DATASHEET

Chapter 4 Configuration Options

The USB5532B must be configured in order to correctly function when attached to a USB host

controller. The hub can be configured either internally or externally depending on the implemented

interface (see Chapter 5: Interfacing to the USB5532B on page 17 for details).

4.1

SPI ROM

When the SPI interface is configured, the USB5532B is will perform code execution from an external

SPI ROM.

4.2

SMBus

Two SMBus modes (based on the used slave address) are available: Legacy and Advanced.

4.2.1

SMBus Legacy Mode

The SMBus Legacy Mode provides access to all internal USB 2.0 registers, and is enabled based on

the 7-bit slave address of 0101100b. The hub will not respond to the general call address of 0000000b.

4.2.2

SMBus Advanced Mode

The SMBus Advanced Mode provides access to all USB 2.0 and USB 3.0 registers, and is enabled

based on the 7-bit slave address of 0101101b. The hub will not respond to the general call address

of 0000000b. The protocol is based on the SMBus block read/write, except the register offset is

extended to 16 bits (high byte, low byte).