Figure 292. Sdio Adapter Command Path - ST STM32F205 series Reference Manual

Advanced arm-based 32-bit mcus

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Table of Contents

Secure digital input/output interface (SDIO)

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 292. 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

743). When the response is received, the received CRC code and the

internally generated code are compared, and the appropriate status flags are set.

RM0033 Rev 8

SDMMC_CMDout

Figure 293 on

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