USB97C102 datasheet(64/80 Pages) SMSC

64 / 80 page

SMSC DS – USB97C102

Page 64

Rev. 03/23/2000

USB HUB BLOCK

The registers shown below interface the Internal 8051 MCU with the SMC SMSC97C102 internal Hub Block. The

MCU, subsequent to reset and initialization, must initialize the HUB register block as its first task. Initialization of the

registers below, must be accomplished within two (2) ms after the de-assertion of reset. The MCU must initialize the

registers before the up stream host controller relinquishes its reset pulse to the internal HUB block so that the Host

Controller can enumerate the device.

Below is a block diagram of the HUB block. As indicated in the diagram, the HUB block consists of the Hub Repeater,

Control and Command sequencer.

SIU System Interface Unit

This module consists of address decoding and multiplex logic. The address decoder logic is used to compare the

address received from the host during a SETUP, IN or OUT token transfer with the address of the HUB. There are

two address decodes, one for the HUB endpoint and one for the Remote Device Bay Control endpoint which is not

part of the HUB Block.

HIU Hub Interface Unit

The Hub Interface Unit (HIU) provides the hub controller function of this compound device. The hub controller

provides the functionality for Host to HUB communication. The HUB specific control and status commands defined in

the USB and HUB device class specification permit the host controller to configure the HUB and control and monitor

each down stream port. The HUB control block, for the most part, is like a full speed device on USB and hence it

consists of all the function blocks needed to implement a device. Included in the functionality required is endpoint 0

control, enumeration, control packet decoding, status maintenance and reporting. Additional functions that will be

performed by the HUB block include:

!" Provide Hub descriptors defined the HUB USB Device Class Specification V 1.1

!" Hub Configuration

!" Hub and Port Status

Hub Repeater

USB97C102 - Hub Compound Device Block

Hub Serial Interface Engine

Hub Port

Control

PORT0

SIU

HIU

Hub Command Sequencer

Power

Control

Mode

From Control Reg.

Upstream Port

Down Stream Ports

Hub Port

Control

PORT5

Walkup

USB

Hub Port

Control

PORT4

Walkup

USB

Hub Port

Control

PORT3

Walkup

USB

Hub Port

Control

PORT2

Walkup

USB

Hub Port

Control

PORT1

Internal

SIE

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