SH7720 Datasheet, PDF (911/1524 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7700 Series

25.5 EP4 Isochronous-Out Transfer
Section 25 USB Function Controller (USBF)
USB function
SOF reception
Interrupt request (SOF)
FIFO buffer switch over
Out-token reception
FIFO A side
Data reception from host
No errorin
receive data?
No
Yes
Set EP4 normal
reception flag to 1
(IFR3/EP4 TS = 1)
Set EP4 abnormal
reception flag to 1
(IFR3/EP4 TF = 1)
SOF reception
Interrupt request (SOF)
FIFO buffer switch over
Out-token reception
Data reception from host
FIFO B side
No errorin
receive data?
No
Yes
Set EP4 normal
reception flag to 1
(IFR3/EP4 TS = 1)
Set EP4 abnormal
reception flag to 1
(IFR3/EP4 TF = 1)
Firmware
Clear SOF packet
detection flag
(IFR2/SOF = 0)
Read time stamp
register H, L(TSRH,TSRL)
No
Time stamps
match?
Yes
To figure
25.15
A
FIFO B side
Read EP4 flag
(IFR3/EP4 TS, EP4 TF)
Read EP4
receive data size register
(EPSZ4)
Read data
from EP4 data register
(EPDR4)
Clear SOF packet
detection flag
(IFR2/SOF = 0)
Read time stamp
register H, L(TSRH,TSRL)
No
Time stamps
match?
To figure
25.15
A
Yes
FIFO A side
Read EP4 flag
(IFR3/EP4 TS, EP4 TF)
Read EP4
receive data size register
(EPSZ4)
Read data
from EP4 data register
(EPDR4)
Figure 25.14 EP4 Isochronous-Out Transfer Operation (SOF is Normal)
Rev. 3.00 Jan. 18, 2008 Page 849 of 1458
REJ09B0033-0300