M66290AFP datasheet(24/54 Pages) RENESAS

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USB DEVICE CONTROLLER

M66290AGP/FP

MITSUBISHI <DIGITAL ASSP>

Control

transf er

sequence

error

Control

write

status

stage

Control

write

data

stage

Setup

stage

Control

read

data

stage

Control

read

status

stage

Control

write

no data

stage

status

Receiv e short packet

or Receiv e IN token

(Control write transfer

status stage transition)

Transmit short packet

or Receiv e OUT token

(Control read transfer

status stage transition)

ACK transmit

(Setup stage complete)

ACK transmit

(Setup stage complete)

ACK receive

(Control transfer

complete)

ACK receive

(Control transfer

complete)

ACK receive

(Control transfer

complete)

Receive

Error detected

Figure 6. Stage shift of control transfer

Control transfer stage transition

M66290A manages control transf er sequence by H/W.

There are setup stage, data stage, and status stage in

control transf er stage, as shown in f igure 6. And when

stage shif ts, CTRT interrupt occurs.

There are f iv e f actors in CTRT interrupt, that is, setup

stage end, control write transf er status stage shif t,

control read transf er status stage shif t, control transf er

end, and control transf er sequence error. And there are

sev en errors as f ollows in control transf er sequence

error which can be detected by H/W.

If H/W detected control transf er sequence error,

response PID is set to STALL("1x") automatically.

1. IN token packet receiv e in control write data stage

(In token packet receiv e which did not do ACK

handshake once to OUT token packet in data stage)

2. OUT token packet receiv e in control write status stage

3. OUT token packet receiv e in control read data stage.

(OUT token packet receiv e which did not do data transf er

once to IN token packet in data stage).

4. IN token packet receiv e in control read status stage.

5. Data packet receiv e except f or Null data in control

read status stage.

6. OUT token packet receiv e in control write no data

status stage.

7. Data receiv e which exceeds maximum packet size.

In control write data stage, it can not be recognized as

sequence error when receiv ed data packet which exceeds

request wLength v alue.

setup packet

(Setup stage complete)

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