Kontron SMARC-sAT30 - Manual (Page 35)

User’s Guide
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3.2.16 SDIO Interface
The SMARC sAT30 module supports a 4bit SDIO interface, per the SMARC specification. The SDIO interface uses 3.3V
signaling, per the SMARC spec and for compatibility with commonly available SDIO cards.
SDIO interface signals are exposed on the SMARC sAT30 edge connector as shown below:
SMARC sAT30 Edge finger NVIDIA T30 CPU Net Name Notes
Pin # Pin Name Pin # Pin Name
P39 SDIO_D0 K1 SDMMC1_DAT0 SDIO_D[0]
SDIO Data
P40 SDIO_D1 K2 SDMMC1_DAT1 SDIO_D[1]
P41 SDIO_D2 K3 SDMMC1_DAT2 SDIO_D[2]
P42 SDIO_D3 K4 SDMMC1_DAT3 SDIO_D[3]
P34 SDIO_CMD N6 SDMMC1_CMD SDIO_CMD
SDIO Command
signal
P36 SDIO_CK M6 SDMMC1_CLK SDIO_CLK SDIO Clock signal
P33 SDIO_WP K5 CLK2_OUT SDIO_WP
SDIO write protect
signal
P35 SDIO_CD# M5 GPIO_PV2 SDIO_CD# SDIO card detect
P37 SDIO_PWR_EN M1 GPIO_PV3 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 SMARC
Evaluation Carrier schematic is useful as an implementation reference.