Datasheet

SD_BUS_WIDTHS
Describes all the DAT bus widths that are supported by this card.
SD_BUS_WIDTHS
Supported Bus Widths
Bit 0
1 bit (DAT0)
Bit 1
reserved
Bit 2
4 bit (DAT0-3)
Bit 3
reserved
SD Memory Card Supported Bus Widths
Since SD Memory Card shall support at least the two bus modes 1bit or 4bit width then any SD Card shall set at least bits
0 and 2 (SD_BUS_WIDTH="0101").