RM0319 datasheet(181/368 Pages) STMICROELECTRONICS

181 / 368 page

RM0319

MMC-SD card/SDIO controller

Doc ID 022640 Rev 3

181/368

Figure 57.

MMC-SD/SDIO controller block diagram

The host controller can be used to control an external memory card via command protocol.

Data transfer can be performed either directly by the CPU (without using DMA) or using the

dedicated DMA unit of the memory card controller. Interrupts are generated to the ARM

Processor based on the values set in the interrupt status register and interrupt enable

registers. The clock generation block will generate the SD clock depending on the value

programmed by software in the clock control register. The CRC7 and CRC16 generators

calculate the CRC for command and data respectively to send the CRC to the SD card. The

CRC7 and CRC16 checker checks for any CRC error in the response and data sent by the

SD/SDIO card.

The host controller alternatively uses two dual-port 4KB FIFOs for read (data transferred

from card to processor) and write (data transferred from processor to card) transactions.

The SD_DATA[7:0] control logic block transmits data in the data lines during write

transaction and receives data in the data lines during read transaction.

The Command control logic block sends the command in the CMD line and receives the

response coming from the SD2.0/SDIO2.0/MMC4.2 card.

Power

Management

AHB

Interface

Registers

Data

FIFO

Bus Monitor

Clock

Control

SD Protocol

Unit

Command

Control

Unit

Data

Control

Unit

SDIO2.0/

SDIO2.0 Mem

MMC 3.31/4.2

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