Secure digital input/output interface (SDIO) RM0390
980/1328 RM0390 Rev 4
Command path
The command path unit sends commands to and receives responses from the cards.
Figure 379. SDIO adapter command path
• Command path state machine (CPSM)
– 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 Figure 380 on
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.
06Y9
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7R$3%LQWHUIDFH
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ORJLF
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