M66290AFP datasheet(13/54 Pages) RENESAS

13 / 54 page

USB DEVICE CONTROLLER

M66290AGP/FP

MITSUBISHI <DIGITAL ASSP>

Figure 2. shows the examples of interrupt output timing

(1) Endpoint buff er ready interrupt (ex.OUT transaction)

USB

PID

SYNC

Addr Endp CRC EOP

SYNC

PID

DATA

CRC EOP

SYNC

PID

EOP

OUT token packet

Data packet

Hand shake packet (ACK)

INT output

Buff er becomes ready (read enable)

and interrupt occurs

(2) Endpoint buff er not ready interrupt (ex.OUT transaction)

USB

PID

SYNC

Addr Endp CRC EOP

SYNC

PID

DATA

CRC EOP

SYNC

PID

EOP

OUT token packet

Data packet

Hand shake packet (NAK)

INT output

Buff er is in not ready (receiv e disable)

and interrupt occurs

(3) Endpoint buff er not ready interrupt (ex.IN transaction)

USB

PID

SYNC

Addr Endp CRC EOP

SYNC

PID

EOP

IN token packet

Hand shake packet (NAK)

INT output

Buff er is in not ready (transmit disable)

and interrupt occurs

Figure 2. Examples of interrupt output timing

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