SAMV71 Xplained Ultra Software Package 1.4
Purpose
highlight of sdhc
Sdhc initialization and identification
- Refer to page "sdcard sd mode initialization and identification" for the initialization and identification sequence of a sdhc.
Functional difference between sdhc and standard capacity sdcard
- Command argument is different:
- Sdhc uses block address format in memory access commands*, block length is fixed to 512 bytes.
- Standard capacity sdcard uses byte address format in memory access commands, block length is defined in Cmd16.
- Partial access and misalign access are disabled in sdhc as the block address is used.
- Sdhc does not support write-protected commands (Cmd28, Cmd29, Cmd30).
- Note:
- Memory access commands means block read commands (CMD17, CMD18), block write commands (CMD24, CMD25), and block erase commands (CMD32, CMD33).