ST STM32F446 Series

Secure digital input/output interface (SDIO) RM0390
976/1328 RM0390 Rev 4
Figure 373. Sequential read operation
Figure 374. Sequential write operation
29.3 SDIO functional description
The SDIO consists of two parts:
• The SDIO adapter block provides all functions specific to the MMC/SD/SD I/O card
such as the clock generation unit, command and data transfer.
• The APB2 interface accesses the SDIO adapter registers, and generates interrupt and
DMA request signals.
Figure 375. SDIO block diagram
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