Figure 313. Sdio Adapter Command Path - ST STM32F412 Reference Manual

RM0402
Command path
The command path unit sends commands to and receives responses from the cards.
To control unit
Adapter registers
To APB2 interface
•
Command path state machine (CPSM)
–

Figure 313. SDIO adapter command path

CMD
Argument
CMD
Response
registers
When the command register is written to and the enable bit is set, command
transfer starts. When the command has been sent, the command path state
machine (CPSM) sets the status flags and enters the Idle state if a response is not
required. If a response is required, it waits for the response (see
page 870). When the response is received, the received CRC code and the
internally generated code are compared, and the appropriate status flags are set.
Secure digital input/output interface (SDIO)
Status Control Command
flag logic
Shift
register
RM0402 Rev 6
timer
SDIO_CMDin
SDIO_CMDout
CRC
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