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Table 2 SD/SDHC card pin details

From: A low cost and fast controller architecture for multimedia data storage and retrieval to flash-based storage device

Pin No. Name Function in SD mode Function in SPI mode
1 DAT3/(\(\bar {CS}\)) Data line 3 Chip select/slave select (\(\bar {SS}\))
2 CMD/DI Command line MOSI
3 Vss1 Ground Ground
4 VDD Supply voltage Supply voltage
5 Clock Clock Clock (SCLK)
6 Vss2 Ground Ground
7 DAT0/DO Data line 0 MISO
8 DAT1/IRQ Data line 1 Unused/IRQ
9 Dat2/NC Data line 2 Unused