Table of Contents

eMMC Commands
- Command Table
  - CMD6
  - Multiple Block Xfer Command

eMMC Commands

Document eMMC Commands.

Command Table

Command	Data Line	Response	Description	Version	Addend
CMD1	-	R3	Ask device to send its OCR.
CMD6	b	R1b	Switches the mode of operation of the selected Device or modifies the EXT_CSD registers
CMD9	-	R2	Obtain CSD on the CMD line.
CMD7	-	R1/R1b	Command toggles a device between the standby and transfer or between the programming and disconnect.
CMD13	-	R1	Addressed card sends its status register.
CMD8	R	R1	Device sends its EXT_CSD register as a block of data
CMD18	R	R1	Read multiple blocks.
CMD17	R	R1	Read single bolck.
CMD24	R	R1	Write single block.
CMD25	R	R1	Write multiple blocks.

CMD6

Unlike SD, eMMC cards don't have a configuration register to notify supported bus width.
The speed mode supported by the card can be determined by the DEVICE_TYPE (196th byte) of EXT_CSD.

Multiple Block Xfer Command

The following commands will continuously write/read blocks of data until a STOP_TRANSMISSION (CMD12) follows or the requested number of block (Specified by CMD23) received.

CMD18 - Read multiple blocks.
CMD25 - Write multiple blocks.