Chapter 10. Sd Card And Sdio; Table 10-1. Sdio Pin Descriptions - Nvidia Jetson Xavier NX Design Manual

Chapter 10. SD Card and SDIO

Jetson Xavier NX uses one SDMMC interface for on-module eMMC (SDMMC4 on Xavier) and
brings one to the connector pins for SD Card or SDIO use.

Table 10-1. SDIO Pin Descriptions

Module Pin
Pin # Xavier Signal
Name
229 SDMMC_CLK SDMMC3_CLK
227 SDMMC_CMD SDMMC3_CMD
219 SDMMC_DAT0 SDMMC3_DAT0
221 SDMMC_DAT1 SDMMC3_DAT1
223 SDMMC_DAT2 SDMMC3_DAT2
225 SDMMC_DAT3 SDMMC3_DAT3
Notes:
1. In the Type/Dir column, Output is from Jetson Xavier NX. Input is to Jetson Xavier NX. Bidir is for Bidirectional signals.
2. The direction shown in the table above for SDMMC_CLK is true when used for that function. If used as a GPIO, the pin supports
input or output (bidirectional).
3. If the SDMMC pins are connected to a 1.8V only device, the interface voltage should be configured for 1.8V operation in the Pinmux.
NVIDIA Jetson Xavier NX
Usage/Description
SD Card or SDIO Clock
SD Card or SDIO Command
SD Card or SDIO Data 0
SD Card or SDIO Data 1
SD Card or SDIO Data 2
SD Card or SDIO Data 3
Recommended Directio
Pin Type
Usage n
Output
SD Card or SDIO CMOS –
Device 1.8V/3.3V
Bidir
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