SD_TRANSFER_TYPE enumeration (sddef.h)

The SD_TRANSFER_TYPE enumeration specifies the type of a Secure Digital (SD) data transfer.

Syntax

typedef enum {
  SDTT_UNSPECIFIED,
  SDTT_CMD_ONLY,
  SDTT_SINGLE_BLOCK,
  SDTT_MULTI_BLOCK,
  SDTT_MULTI_BLOCK_NO_CMD12
} SD_TRANSFER_TYPE;


`SDTT_UNSPECIFIED` Unspecified.
`SDTT_CMD_ONLY` Indicates that the request involves a transfer of command information or small amounts of data over the CMD line only. It does not involve a data transfer over the DAT lines. This transfer type includes operations such as card selection, the transfer of descriptors during initialization of a card, or the retrieval of a byte of information from a card register.
`SDTT_SINGLE_BLOCK` Indicates that the request reads or writes a single block. The I/O block size register specifies the size, in bytes, of a block.
`SDTT_MULTI_BLOCK` Indicates that the request reads or writes multiple blocks of data. The I/O block size register specifies the size, in bytes, of a block.
`SDTT_MULTI_BLOCK_NO_CMD12` Indicates that the request reads or writes multiple blocks of data. The transfer terminates automatically and does not require termination by a CMD12 command. For a description of the CMD12 command, see the MultiMedia Card specification.

Requirement	Value
Header	sddef.h (include Sddef.h)