7643 datasheet(219/424 Pages) RENESAS

219 / 424 page

Rev.2.00

Aug 28, 2006

page 98 of 202

7643 Group

REJ09B0133-0200

APPLICATION

2.6 USB

Fig. 2.6.3 Transaction format

➀ IN transaction

(Idle state)

DATA0/1

NAK STAL

ACK

➁ OUT transaction

OUT

ACK NAK STALL

DATA0/1

➂ SETUP transaction

SETUP

ACK

DATA0

➃ Isochronous transaction (IN)

DATA0/1

➃ Isochronous transaction (OUT)

OUT

DATA0/1

: Token packet sent by host

: Date packet sent by device

: Handshake packet sent by device

: Handshake packet sent by host

: Date packet sent by host

(Idle state)

Outline of processing

Host CPU informs device of operation process.

Host CPU requests data transmit from device.

Host CPU requests data receive from device.

Host CPU informs start of frame to device.

Indicates that the number of transfer data sequence bits is even.

Indicates that the number of transfer data sequence bits is odd.

Reports that data transmit was successfully completed.

Reports that the device is in the transfer ready status.

Reports that transfer was completed successfully.

q Transaction

A transaction is the unit in which the host CPU schedules 1 frame. Each transaction is comprised

of packets. The transaction format is shown below.

Table 2.6.1 USB PID list

bit structure

(bit 3 to bit 0)

11012

10012

00012

01012

00112

10112

00102

10102

11102

PID

name

SETUP

OUT

SOF

DATA0

DATA1

ACK

NAK

STALL

PID

type

Token

Data

Handshake

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