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RM0319 датащи(PDF) 184 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) 184 Page - STMicroelectronics

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MMC-SD card/SDIO controller
RM0319
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Doc ID 022640 Rev 3
14.5.3
Issuing a command
Figure 60.
Command issue sequence
1.
Check Command Inhibit (CMD) in the Present State register. Repeat this step until
Command Inhibit (CMD) is logic ‘0’.
2.
If the Host Driver issues a SD Command with busy signal, go to step (3). If there is no
busy signal, go to step (5).
3.
If the Host Driver issues an abort command, go to step (5). In the case of no abort
command, go to step (4).
4.
Check Command Inhibit (DAT) in the Present State register. Repeat this step until
Command Inhibit (DAT) is set to logic ‘0’.
5.
Set the value of the command argument to the Argument register.
6.
Set the Command register.
7.
Perform the Command Completion Sequence (see Section 14.5.4 below).
Start
End
(1)
(5)
Check Command
Inhibit (CMD)
CMD Line free
Issue the command
with the busy?
Yes
Issue Abort
Command?
No
Check Command
Inhibit(DAT)
DAT Lone used
DAT Lone free
New command can be issued
Set Argument Reg
Set Command Reg
Command Complete Sequence
CMD Line used
(2)
(3)
(4)
(6)
(7)
Yes
No



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