Renesas SH7781 - Manual (Page 1265)

24. Multimedia Card Interface (MMCIF)
Rev.1.00 Jan. 10, 2008 Page 1235 of 1658
REJ09B0261-0100
No
End of command sequence
Write data to FIFO
Set DATAEN to 1
Yes
No
Next block write?
Yes
DTBUSY detected?
Yes
DBSYI interrupt
detected?
No
Yes
*
CRCERI interrupt
detected?
No
Yes
Note: * Write block size of data (if block size < or = FIFO size) or FIFO size of data (if block size > FIFO size).
Len: Block length [bytes]
Cap: FIFO size [bytes]
n (FEI): Number of FIFO empty interrupts (FEI) from the start of read sequence
n (DRPI): Number of data response interrupts (DRPI) from the start of write sequence
Legend:
DTERI interrupt
detected?
Yes
No
DRPI interrupt
detected?
Yes
Cap × n (FEI)
- Len (1 + n (DTI))
≥ Len
No
No
Yes
DTI interrupt
detected?
No
Yes
FEI interrupt
detected?
No
Set CMDOFF to 1 Set CMDOFF to 1
Execute CMD12
1 2
Figure 24.20 (2) Example of Operational Flow for Commands with Write Data
(Open-ended Multiple Block Transfer)