Kontron SMARC-sA3874i - Manual (Page 34)

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User’s Guide
3.2.16 SDIO Interface
The ULP-COM sA3874i module supports a 4bit SDIO interface, per the ULP-COM specification. The SDIO interface
uses 3.3V signaling, per the ULP-COM spec and for compatibility with commonly available SDIO cards.
SDIO interface signals are exposed on the ULP-COM sA3874i edge connector as shown below:
ULP-COM sA3874i Edge finger TI Cortex A8 CPU Net Name Notes
Pin # Pin Name Pin # Pin Name
P39 SDIO_D0 P1 SD1_DAT[0] SDIO_D[0] SDIO Data
P40 SDIO_D1 P5 SD1_DAT[1]/SDIRQ# SDIO_D[1]
P41 SDIO_D2 P4 SD1_DAT[2]/SDRW# SDIO_D[2]
P42 SDIO_D3 P6 SD1_DAT[3] SDIO_D[3]
P34 SDIO_CMD P2 SD1_CMD/GP0[0] SDIO_CMD SDIO Command
signal
P36 SDIO_CK P3 SD1_CLK SDIO_CK SDIO Clock signal
P33 SDIO_WP AG4 SD1_SDWP SDIO_WP SDIO write protect
signal
P35 SDIO_CD# SDIO_CD# SDIO card detect
P37 SDIO_PWR_EN AH4 SD1_POW SDIO_PWR_EN SD card power
enable
The SDIO card power should be switched on the Carrier board and the SDIO lines should be ESD protected. The
ULP-COM Evaluation Carrier schematic (KAI 501-146) is useful as an implementation reference.