Renesas SH7781 - Manual (Page 1263)

24. Multimedia Card Interface (MMCIF)
Rev.1.00 Jan. 10, 2008 Page 1233 of 1658
REJ09B0261-0100
Start of command sequence
Clear FIFO
Execute CMD16
Read response register
Execute CMD24
(Set CMDR then CMDSTRT)
Set the size of block
for transfer in TBCR
No
Yes
CRCERI interrupt
detected?
Yes
No
CMD16
normal end?
Yes
No
CRPI interrupt
detected?
Yes
No
No
Response status
normal?
Yes
No
End of command sequence
CTERI interrupt
detected?
Set CMDOFF to 1
Write data to FIFO
Set DATAEN to 1
Yes
DTBUSY detected?
Yes
DBSYI interrupt
detected?
No
Yes
CRCERI interrupt
detected?
No
Yes
Legend:
Len:
Block length [bytes]
Cap: FIFO size [bytes]
n (FEI): Number of FIFO empty interrupts (FEI)
from the start of read sequence
DTERI interrupt
detected?
Yes
No
DRPI interrupt
detected?
Yes
Cap × n (FEI) ≥ Len
No
No
Yes
DTI interrupt
detected?
No
Yes
FEI interrupt
detected?
No
Figure 24.19 Example of Operational Flow for Commands with Write Data
(Single Block Transfer)