Section 24 Multimedia Card Interface (MMCIF)
Rev.1.00 Dec. 13, 2005 Page 932 of 1286
REJ09B0158-0100
24.6
Operations when Using DMA
24.6.1
Operation in Read Sequence
In order to transfer data in FIFO with the DMAC, set MMCIF (DMACR) after setting the
DMAC*. Transmit the read command after setting DMACR.
Figure 24.22 to 24.24 shows the operational flow for a read sequence.
•
Clear FIFO and make settings in DMACR.
•
Read command transmission is started.
•
Command response is received from the card.
•
Read data is received from the card.
•
After the read sequence, data remains in FIFO. If necessary, write 100 to SET[2:0] in DMACR
to read all data from FIFO.
•
Confirm that the DMAC transfer is completed and set the DMAEN bit in DMACR to 0.
•
Set the CMDOFF bit to 1 and clear DMACR to H'00 if a CRC error (CRCERI) or a command
timeout error (CTERI) occurs in the command response reception.
•
Set the CMDOFF bit to 1, clear DMACR to H'00, and clear FIFO if a CRC error (CRCERI) or
a data timeout error (DTERI) occurs in the read data reception.
When using DMA, next block read is resumed automatically when the AUTO bit in DMACR is
set to 1 and normal read is detected after the block transfer end of a pre-defined multiple block
transfer. Figure 24.25 shows the operational flow for a pre-defined multiple block read using auto-
mode.
•
Clear FIFO.
•
Set the block number to TBNCR.
•
Set DMACR.
•
Read command transmission is started.
•
Command response is received from the card.
•
Read data is received from the card.
•
Detect the command timeout error (CTERI) if a command response is not received from the
card.
•
The end of the command sequence is detected by poling the BUSY flag in CSTR or through
the pre-defined multiple block transfer end flag (BTI).
Summary of Contents for SH7780 Series
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Page 82: ...Section 1 Overview Rev 1 00 Dec 13 2005 Page 32 of 1286 REJ09B0158 0100 ...
Page 122: ...Section 3 Instruction Set Rev 1 00 Dec 13 2005 Page 72 of 1286 REJ09B0158 0100 ...
Page 146: ...Section 4 Pipelining Rev 1 00 Dec 13 2005 Page 96 of 1286 REJ09B0158 0100 ...
Page 196: ...Section 6 Floating Point Unit FPU Rev 1 00 Dec 13 2005 Page 146 of 1286 REJ09B0158 0100 ...
Page 292: ...Section 9 L Memory Rev 1 00 Dec 13 2005 Page 242 of 1286 REJ09B0158 0100 ...
Page 492: ...Section 12 DDR SDRAM Interface DDRIF Rev 1 00 Dec 13 2005 Page 442 of 1286 REJ09B0158 0100 ...
Page 674: ...Section 15 Clock Pulse Generator CPG Rev 1 00 Dec 13 2005 Page 624 of 1286 REJ09B0158 0100 ...
Page 692: ...Section 16 Watchdog Timer and Reset Rev 1 00 Dec 13 2005 Page 642 of 1286 REJ09B0158 0100 ...
Page 726: ...Section 18 Timer Unit TMU Rev 1 00 Dec 13 2005 Page 676 of 1286 REJ09B0158 0100 ...
Page 1032: ...Section 25 Audio Codec Interface HAC Rev 1 00 Dec 13 2005 Page 982 of 1286 REJ09B0158 0100 ...
Page 1150: ...Section 28 General Purpose I O GPIO Rev 1 00 Dec 13 2005 Page 1100 of 1286 REJ09B0158 0100 ...
Page 1184: ...Section 29 User Break Controller UBC Rev 1 00 Dec 13 2005 Page 1134 of 1286 REJ09B0158 0100 ...
Page 1266: ...Section 31 Electrical Characteristics Rev 1 00 Dec 13 2005 Page 1216 of 1286 REJ09B0158 0100 ...
Page 1328: ...Appendix Rev 1 00 Dec 13 2005 Page 1278 of 1286 REJ09B0158 0100 ...
Page 1336: ...Rev 1 00 Dec 13 2005 Page 1286 of 1286 REJ09B0158 0100 ...
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