7643 datasheet(223/424 Pages) RENESAS

223 / 424 page

Rev.2.00

Aug 28, 2006

page 102 of 202

7643 Group

REJ09B0133-0200

APPLICATION

2.6 USB

Fig. 2.6.5 Device state transition

Connecting

HUB configuration

released

Power on

Power off

Default

Set address request

Address

Set Configuration request

Configuration

Bus no active

Suspend

Bus active

Bus no active

Suspend

Bus active

Bus no active

Suspend

Bus active

Bus no active

Suspend

Bus active

Bus reset

HUB configuration

(4)

Device State

The device has various states and can transit states. In the 7643 Group, control the state transition

by software, not hardware.

Enumelation is the continuous process from bus connection to system configuration.

1. Connection state: When the device is connected to the bus.

2. Power-on state: When the HUB has been configured and power is supplied to the bus.

3. Default state: When a reset signal is received from the host CPU. Default address (0) is

configured.

4. Address assignment state: When the SET_ADDRESS standard device request is received. This

is the unconfigured state (configuration 0).

5. The device is configured when the SET_CONFIGURATION standard device request is received.

6. Suspend state: When there is no activity on the bus for a 3ms period.

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