RM0319 datasheet(192/368 Pages) STMICROELECTRONICS

192 / 368 page

MMC-SD card/SDIO controller

RM0319

192/368

Doc ID 022640 Rev 3

14.5.8

Aborting the transaction

Figure 65.

Abort transaction sequence

An abort transaction is performed by issuing CMD12 for a SD memory card and CMD52 for

a SDIO card. The host controller can do an abort transaction to stop infinite block transfers

or stop transfers while a multiple block transfer is executing.

In an asynchronous abort sequence, the host controller can issue an abort command at

anytime unless Command Inhibit (CMD) in the Present State register is set to logic ‘1’. In a

synchronous abort, the host controller must issue an Abort Command after the data transfer

stopped by using Stop At Block Gap Request in the Block Gap Control register.

Start

(1)

(2)

(3)

(2)

Issue Abort Command

Set Software Reset For

DAT Line(DR) and CMD

Line(CR)

Wait for

Transfer Complete Int

Transfer

Complete Int occur

Clr Transfer Complete

Status

Issue Abort

Command

Set Stop at Block Gap

Request

(4)

End

Check

DR and

CR=0 and

DR=0

CR=1 or

DR=1

Start

Set Software Reset For

DAT Line(DR) and CMD

Line(CR)

CR=1 or

DR=1

CR=0 and

DR=0

Check

DR and

(3)

(1)

(5)

(6)

Asynchronous Abort

Sequence

Synchronous Abort

Sequence

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