Sdio Functional Description; Figure 307. Sequential Read Operation; Figure 308. Sequential Write Operation; Figure 309. Sdio Block Diagram - ST STM32F412 Reference Manual

RM0402
SDIO_CMD
SDIO_D
SDIO_CMD
SDIO_D
27.3

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 307. Sequential read operation

From host to
card(s) From card to host
Command Response

Figure 308. Sequential write operation

From host to
card(s) From card to host
Command Response

Figure 309. SDIO block diagram

Interrupts and
DMA request
APB2
interface
APB2 bus
PCLK2
Secure digital input/output interface (SDIO)
Data from card to host
Data stream
Data transfer operation
Data from host to card
Data stream
Data transfer operation
SDIO
SDIO
adapter
SDIOCLK
RM0402 Rev 6
Stop command
stops data transfer
Command Response
Data stop operation
Stop command
stops data transfer
Command Response
Data stop operation
SDIO_CK
SDIO_CMD
SDIO_D[7:0]
MSv36071V1
MSv36072V1
MSv36073V1
865/1163
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