Figure 184. Sdio Adapter Command Path - ST STM32F102 Series Reference Manual

SDIO interface (SDIO)
Command path
The command path unit sends commands to and receives responses from the cards.

Figure 184. SDIO adapter command path

●
Command path state machine (CPSM)
–
418/690
To control unit
Adapter registers
CMD
Argument
To AHB interface
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 419). When the response is received, the received CRC code and the
internally generated code are compared, and the appropriate status flags are set.
Status Control Command
flag logic
Shift
register
CMD
timer
SDIO_CMDin
SDIO_CMDout
CRC
ai14805
Figure 185 on
RM0008