SD卡中的ACMD命令(the application specific commands)
2014-03-23 23:30
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ACMD命令是SD卡不同于MMC卡的部分。常用的有两个命令ACMD41和ACMD6：
(1)ACMD41
Asks to all cards to send their operations conditions.
命令要求SD卡返回它的OCR(Operating Conditions Register)寄存器的内容。
OCR寄存器记录的是支持的SD卡电压范围。
OCR的第31位为1表示SD卡正在上电过程中。
(2)ACMD6
它的工作是设置SD卡的数据线位宽。
(1)ACMD41
Asks to all cards to send their operations conditions.
命令要求SD卡返回它的OCR(Operating Conditions Register)寄存器的内容。
OCR寄存器记录的是支持的SD卡电压范围。
OCR的第31位为1表示SD卡正在上电过程中。
(2)ACMD6
它的工作是设置SD卡的数据线位宽。
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