7643 datasheet(221/424 Pages) RENESAS

221 / 424 page

Rev.2.00

Aug 28, 2006

page 100 of 202

7643 Group

REJ09B0133-0200

APPLICATION

2.6 USB

Control Read transfer

After the SETUP transaction, the IN transaction is repeated to transmit data from the device to the

host (data stage). Then, in order to wait for the host to finish processing the data, an IN transaction

of data empty is executed (status stage).

Control Write transfer

After the SETUP transaction, the OUT transaction is repeated to transmit data from the host to the

device (data stage). Then, in order that host waits the device to finish processing the data, an IN

transaction of data empty is executed (status stage).

No data

After the SETUP transaction, if there is no request for data to be transmitted/received in the data

stage, in order that host waits for the device to finish processing, an IN transaction of data empty

is executed (status stage).

The status stage is used for reporting the results of the setup and data stage operations to the

host CPU. The responses used in the status stage are as follows.

- Function completed normally

Control Write transfer…Data packet

Control Read transfer…ACK handshake

- Error detected in function

Control Write transfer…STALL handshake

Control Read transfer…STALL handshake

- Function in busy state

Control Write transfer…NAK handshake

Control Read transfer…NAK handshake

7643 Datasheet(PDF) 221 Page - Renesas Technology Corp