HD6417320 RENESAS [Renesas Technology Corp], HD6417320 Datasheet - Page 1150

• Manufacturer Part Number: HD6417320
• Description: Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7700 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

Section 31
31.5
31.5.1
For transfer with DMAC, set MMCIF (DMACR) after setting DMAC. Transmit the read
command after setting the DMACR.
Figures 31.23 to 31.26 show the operational flowcharts for read sequence.
• FIFO is cleared and DMACR is set.
• Read command transmission is started.
• Read data is received from the MMC.
• After read sequence, FIFO includes data. If necessary, 100 is written to the SET2 to SET0 bits
• The end of the transfer with the DMAC is confirmed, and 0 is set to the DMAEN bit in
• When the CRC error (CRCERI) or the command timeout error (CTERI) occurs during
• When the CRC error (CRCERI) or the data timeout error (DTERI) occurs during read data
When the DMA is in use, and detected that reading is completed successfully after block transfer
in pre-defined multiblock transfer, reading the next block is automatically performed again by
setting the AUTO bit in DMACR to 1. Figures 31.27 shows the operational flowchart for pre-
defined multi read sequences in MMC mode.
• FIFO is cleared.
• The number of blocks is set to TBNCR.
• DMACR is set.
• Read command transmission is started.
• Command response and read data are received from the MMC.
• If the MMC does not return the command response, it detected by the command timeout error
• Command sequence end is detected by polling the BUSY flag in CSTR or the multiblock
• Errors during command sequence (data reception) are detected by the CRC error flag and the
Rev. 3.00 Jan. 18, 2008 Page 1088 of 1458
REJ09B0033-0300
in DMACR to read every data in FIFO.
DMACR.
command response reception, write 1 to the CMDOFF bit and set DMACR to H'00.
reception, write 1 to the CMDOFF bit and set DMACR to H'00 to clear the FIFO.
flag (CTERI).
transfer (pre-defined) end flag (BTI).
data timeout error flag. When these flags are detected, set the CMDOFF bit in OPCR to 1 to
issue the CMD12 command and suspend the command sequence.
Operations Using DMAC
Operation of Read Sequence
MultiMediaCard Interface (MMCIF)