Renesas SH7781 - Manual (Page 1272)

24. Multimedia Card Interface (MMCIF)
Rev.1.00 Jan. 10, 2008 Page 1242 of 1658
REJ09B0261-0100
Start of command sequence
End of command sequence
Clear FIFO
Execute CMD16
Configure the DMAC
Set DMACR (in the MMCIF)
Read response register
Set DMACR to H'84 Clear DMACR to H'00
Set CMDOFF to 1
Clear DMACR to H'00
CMD16
normal end?
No
Yes
CRPI interrupt
detected?
No
Yes
Response status
normal?
No
Yes
DTI interrupt
detected?
No
Yes
DMA transfer end?
No
Yes
CTERI interrupt
detected?
No
Yes
CRCERI interrupt
detected?
Yes
No
CRCERI interrupt
detected?
Yes
No
DTERI interrupt
detected?
Yes
No
Set the size of block
for transfer in TBCR
Execute CMD17
(Set CMDR then CMDSTRT)
Set CMDOFF to 1
Clear DMACR to H'00
Clear FIFO
Figure 24.22 Example of Read Sequence Flow (Single Block Transfer)