SH7721 datasheet(914/1524 Pages) RENESAS

914 / 1524 page

Section 25

USB Function Controller (USBF)

Rev. 3.00 Jan. 18, 2008 Page 852 of 1458

REJ09B0033-0300

25.6

EP5 Isochronous-In Transfer

SOF reception

Set EP5 transmit flag

(IFR3/EP5 TR = 1)

FIFO buffer

switch over

Yes

In-token reception

FIFO A side

FIFO B side

Data transmission

to host

Set EP5 transmit

request flag

(IFR3/EP5 TR = 1)

Clear SOF packet detection

flag (IFR2/SOF = 0)

Write one packet

of data to EP5 data

FIFO A side

Interrupt request (SOF)

USB function

Firmware

Valid data

in EP5 FIFO?

Data in FIFO B side

has been transmitted?

Data in FIFO A side

has been transmitted?

Yes

FIFO B side

0-byte data

transmission

Read time stamp register

H, L (TSRH, TSRL)

Time stamps

match?

Yes

To figure

25.17

To figure

25.17

Clear SOF packet detection

flag (IFR2/SOF = 0)

Read time stamp register

H, L (TSRH, TSRL)

Time stamps

match?

Set EP5 transmit flag

(IFR3/EP5 TR = 1)

FIFO buffer

switch over

In-token reception

Data transmission

to host

Set EP5 transmit

request flag

(IFR3/EP5 TR = 1)

Valid data

in EP5 FIFO?

0-byte data

transmission

Write one packet

of data to EP5 data

Figure 25.16

EP5 Isochronous-In Transfer Operation (SOF is Normal)

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