Figure 379. Sdio Adapter Command Path - ST STM32F446 Series Reference Manual

Secure digital input/output interface (SDIO)
Command path
The command path unit sends commands to and receives responses from the cards.
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Command path state machine (CPSM)
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Figure 379. SDIO adapter command path

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 981). When the response is received, the received CRC code and the
internally generated code are compared, and the appropriate status flags are set.
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Figure 380 on