RM0319 datasheet(188/368 Pages) STMICROELECTRONICS

188 / 368 page

MMC-SD card/SDIO controller

RM0319

188/368

Doc ID 022640 Rev 3

Set the value to Block Size register.

Set the value to Block Count register.

Set the argument value to Argument register.

Set the value to the Transfer Mode register. The host driver determines Multi/Single

Block Select, Block Count Enable, Data Transfer Direction, Auto CMD12 Enable and

DMA Enable.

Set the value to Command register.

Wait for the Command Complete Interrupt.

Write logic ‘1’ to the Command Complete in the Normal Interrupt Status register for

clearing this bit.

Read Response register and get necessary information of the issued command.

In the case where this sequence is for write to a card, go to step (10). In case it is for

read from a card, go to step (14).

10. Wait for Buffer Write Ready Interrupt.

11. Write logic ‘1’ to the Buffer Write Ready in the Normal Interrupt Status register for

clearing this bit.

12. Write block data to Buffer Data Port register.

13. Repeat until all blocks are sent and then go to step (18).

14. Wait for the Buffer Read Ready Interrupt.

15. Write logic ‘1’ to the Buffer Read Ready in the Normal Interrupt Status register for

clearing this bit.

16. Read block data from the Buffer Data Port register.

17. Repeat until all blocks are received and then go to step (18).

18. If this sequence is for Single or Multiple Block Transfer, go to step (19). In case of

Infinite Block Transfer, go to step (21).

19. Wait for Transfer Complete Interrupt.

20. Write logic ‘1’ to the Transfer Complete in the Normal Interrupt Status register for

clearing this bit.

21. Perform the sequence for Abort Transaction

14.5.6

Transferring data with SDMA

Note:

When using DMA transfer care must be taken to ensure the system memory addresses are

not protected by the MMU, and that cache coherency with the CPU core is managed by

software.

RM0319 датащи(PDF) 188 Page - STMicroelectronics