RM0319 datasheet(189/368 Pages) STMICROELECTRONICS

189 / 368 page

RM0319

MMC-SD card/SDIO controller

Doc ID 022640 Rev 3

189/368

Figure 63.

Data transaction sequence with SDMA

Set the SDMA System Address register which contains the system memory address.

Set the value to the Block Size register.

Set the value to the Block Count register.

Set the argument value to the 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 the Command register.

Then wait for the Command Complete Interrupt.

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

clear bit.

Start

End

(1)

(2)

(3)

(4)

(6)

(7)

(9)

(13)

(5)

(8)

(10)

(11)

(12)

(14)

Set System Address Reg

Set Block Size Reg

Set Block Count Reg

Set Argument Reg

Set Transfer Mode Reg

Set Command Mode Reg

Wait for

Command Complete Int

Command

Complete Int occur

Clr Command Complete Status

Get Response Data

Wait for

Transfer Complete Int

and DMA Int

Transfer

Complete Int

occur

Check Interrupt

Status

DMA Int occur

Clr DMA Interrupt Status

Set System Address Reg

Clr Transfer Complete Status

Clr DMA Interrupt Status

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