Renesas SH7781 - Manual (Page 1255)

24. Multimedia Card Interface (MMCIF)
Rev.1.00 Jan. 10, 2008 Page 1225 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
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
BTI interrupt
detected?
Yes
No
DTI interrupt
detected?
Yes
No Cap ≥
Len (1 + n (DTI))
- Cap × n (FFI)
Yes
No
TBNCR value
= n (DTI) ?
Set CMDOFF to 1
Execute CMD12
Read data from FIFO
Set CMDOFF to 1
Clear FIFO
1 2
Figure 24.13 Example of Operational Flow for Commands with Read Data (4)
(Pre-defined Multiple Block Transfer)