Renesas SH7781 - Manual (Page 1247)

24. Multimedia Card Interface (MMCIF)
Rev.1.00 Jan. 10, 2008 Page 1217 of 1658
REJ09B0261-0100
• The end of the command sequence is detected by poling the BUSY flag in CSTR, by the data
transfer end interrupt (DTI) or pre-defined multiple block transfer end (BTI).
• Write the CMDOFF bit to 1 if a CRC error (CRCERI) or a command timeout error (CTERI)
occurs in the command response reception.
• Clear the FIFO by writing the CMDOFF bit to 1, when CRC error (CRCERI) and data timeout
error (DTERI) occurs in the read data reception.
MMCCLK
MMCCMD
MMCDAT
CMDSTRT
(CMDSTART)
INTSTR0
(CMDI)
(CMDOFF)
CSTR
(CWRE)
(BUSY)
(REQ)
(CRPI)
(DTI)
(FFI)
(FIFO_FULL)
CMD17 (READ_SINGLE_BLOCK)
OPCR
(RD_CONTI)
Input/output pins
Command Command response
Read data
Command
transmission
started
Single block read command execution sequence
Figure 24.8 Example of Command Sequence for Commands with Read Data
(Block Size
≤ FIFO Size)