MMCSDTimming MMC卡的时序图，比起SD规范又臭又长的文档，要简洁的多了。SD卡也可以以此作为参考-MMCSDTimming MMC card timing diagram, compared to SD specification also documents a long foul, it is necessary to more concise. SD card can also be used as a reference

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linux MMC/SD卡基本理论和驱动开发-linux MMC/SD card driver development of basic theory and