Renesas SH7781 - Manual (Page 1253)

24. Multimedia Card Interface (MMCIF)
Rev.1.00 Jan. 10, 2008 Page 1223 of 1658
REJ09B0261-0100
End of command sequence
Yes
No
FFI interrupt
detected?
Set CMDOFF to 1
Read data from FIFO
Set RD_CONTI to 1
Read data from FIFO
No
Yes
DTERI interrupt
detected?
No
Yes
CRCERI interrupt
detected?
No
Yes
Legend:
Len: Block length [bytes]
Cap: FIFO size [bytes]
n (FFI): Number of FIFO full interrupts (FFI) from the start of read sequence
n (DTI): Number of data transfer end interrupts (DTI) from the start of read sequence
DTERI interrupt
detected?
Yes
No
Read next block?
Yes
No DTI interrupt
detected?
Yes
No Cap ≥
Len (1 + n (DTI))
- Cap × n (FFI)
Set CMDOFF to 1
Execute CMD12
Set CMDOFF to 1
Execute CMD12
Clear FIFO
1 2
Figure 24.13 Example of Operational Flow for Commands with Read Data (2)
(Open-ended Multiple Block Transfer)