7643 datasheet(220/424 Pages) RENESAS

220 / 424 page

Rev.2.00

Aug 28, 2006

page 99 of 202

7643 Group

REJ09B0133-0200

APPLICATION

2.6 USB

Fig. 2.6.4 Communication sequence of control transfer

Control transfer

q Control Read

q Control Write

q No control data

Setup stage

SETUP

DATA0

Handshake

Data stage

DATA1/0

Handshake

Status stage

OUT

DATA1

Handshake

Setup stage

SETUP

DATA0

Handshake

Data stage

OUT

DATA1/0

Handshake

Status stage

DATA1

Handshake

Setup stage

SETUP

DATA0

Handshake

Status stage

DATA1

Handshake

: Device issue

: Host issue

(3)

Communication sequence

Each transfer type has a different transfer sequence, as described below.

Control transfer communication sequence

The control transfer is the common transfer type used at setup for all devices. Each transfer

process consists of three different stages. The control transfer starts with the setup stage. Based

on the contents of the Setup stage, the data stage (control Read transfer or control Write transfer)

is executed. When the transfer is complete, the status stage is executed, completing one full

process.

Endpoint 0 is always used for control transfer.

Figure 2.6.4 shows the communication sequence for a control transfer.

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