M66290AFP datasheet(33/54 Pages) RENESAS

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USB DEVICE CONTROLLER

M66290AGP/FP

MITSUBISHI <DIGITAL ASSP>

Af ter "Data1" transmit end

"Data2" write end

"Data3" write start

"Data1" write end

"Data1" write start

In token receive

Before "Data1" transmit end

"Data2" write end

"Data1" transmit end

data1

data transmit impossible

Buff er1

Buff er2

USB side

CPU bus side

Buff er1

Buff er2

writing data

Buff er2

Buff er1

data1

data transmit available

data write available

data2

Buff er2

Buff er1

OUT

transmitting data

writing data

Buff er2

Buff er1

transmitting data

data write completed

data2

Buff er1

Buff er2

data transmit avalable

data write avalable

Buff er1

Buff er2

data transmit avalable

Buff er1

Buff er2

data3

data2

writing data

data

: Data exists in buff er

(2) Transmitting

Below are the transmit status examples

of the endpoint which is set to double buff er.

Endpoint buffer status

Figure 8. Double buff er activ ities-2

"Data1" transmit start

"Data2" write start

data write available

data transmit impossible

OUT

data writeimpossible

data2

data write avalable

Can not transmit because the

transmit buff er is in NotReady.

Request CPU to prepare transmit

data by INTN interrupt

Data write is av ailable during

data transmitting.

When data transmit ended, it occurs

INTR interrupt because the buff er

is in Ready.

End of data write of m aximum packet

size or to set(short packet transmit)

set status, and transmit becomes enable.

And occurs INTR interrupt because

the buff er is in Ready (write enable).

IVAL f lag, it becomes transmit data

End of data write of maximum packet

size or to set (short packet transmit)

set status, and transmit becomes enable.

IVAL flag, it becomes transmit data

When data transmit ended,

because the buff er is in

it occurs INTR interrupt

Ready.

data transmit avalable

M66290AFP Datasheet(PDF) 33 Page - Renesas Technology Corp

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