M66290AFP datasheet(32/54 Pages) RENESAS

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USB DEVICE CONTROLLER

M66290AGP/FP

MITSUBISHI <DIGITAL ASSP>

Af ter "Data1" read end

"Data2" receiv e end

"Data3" receiv e start

"Data1" read start

"Data2" receiv e start

"Data1" receiv e end

"Data1" receiv e start

Bef ore "Data1" read end

"Data2" receiv e end

"Data1" read end

When data receiv e ended, the buff er

is set to Ready state (read enable)

and occurs INTR interrupt

Continuous receiv ing is av ailable

bef ore data read.

In OUT token receiv e to this

INTN interrupt and do NAK

handshake.

endpoint, M66290A occurs

It becomes receiv e enable

af ter read of data1 ended.

And occurs INTR interrupt

because the buff er is ready.

M66290A Occurs INTR interrupt

because the buff er is ready.

data1

data2

receiving data

Buff er1

Buff er2

USB side

CPU bus side

Buff er2

Buff er1

data receive

available

data receive completed

data read available

Buff er2

Buff er1

data1

data2

receiving data

data read available

data1

Buff er2

Buff er1

receiving data

reading data

Buff er2

Buff er1

data receive completed

data receive impossible

reading data

OUT

data1

OUT

Buff er1

Buff er2

data receive enable

data read available

data2

Buff er1

Buff er2

data receive available

data read available

data2

Buff er1

Buff er2

data2

data3

receiving data

data read available

data

: Data exists in buff er

(1) Receiv ing

Below are the receiv e status examples

of the endpoint which is set to double buff er.

Endpoint buffer status

Figure 7. Double buff er activ ities-1

Double buffer operations

The endpoint FIFO of EP1 to EP5 can be

set to double buffer constitution.

So a double of transfer data of its buffer size, which

is set, can be stored.

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