4,199
edits
Changes
From IGEP - ISEE Wiki
no edit summary
=== MMC ===
MMC (Multimedia Controller) is peripheral than can manage SD/MMC/[http://en.wikipedia.org/wiki/Secure_Digital#SDIO SDIO] , but other peripherals can be controled with this interface like Wlan. The MMC/SD/SDIO host controller deals with MMC/SD/SDIO protocol at transmission level, data packing, adding cyclic redundancy checks (CRC), start/end bit, and checking for syntactical correctness. Data transfers between the MMC controller and a memory card can use one bidirectional data line (for the MMC protocol) or four parallel data lines (for the SD protocol). There are three MMC peripherals (MMC1, MMC2 and MMC3) and their use CMOS voltage levels (1V8).It can use ten signals:<br>
- MMC_DAT7: SD/MMC data pin 7. Used by SDIO.<br>- MMC_DAT6: SD/MMC data pin 6. Used by SDIO.<br>- MMC_DAT5: SD/MMC data pin 5. Used by SDIO.<br>- MMC_DAT4: SD/MMC data pin 4. Used by SDIO.<br>- MMC_DAT3: SD/MMC data pin 3. Used in SD card default data mode.<br>- MMC_DAT2: SD/MMC data pin 2. Used in SD card default data mode.<br>- MMC_DAT1: SD/MMC data pin 1. Used in SD card default data mode.<br>- MMC_DAT0: SD/MMC data pin 0. Used in MMC and SD card default data mode.<br>- MMC_CMD: SD/MMC command signal.<br>- MMC_CLK0: SD/MMC clock signal.<br>
Some especifications are:
