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RM0319 датащи(PDF) 192 Page - STMicroelectronics

номер детали RM0319
подробное описание детали  SPEAr320S architecture and functionality
PDF  368 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

RM0319 датащи(HTML) 192 Page - STMicroelectronics

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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
End
Check
DR and
CR
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
CR
(3)
(1)
(5)
(6)
Asynchronous Abort
Sequence
Synchronous Abort
Sequence



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