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Chapter 9. SD Card and SDIO
Jetson TX2 NX uses one SDMMC interface for on-module eMMC (SDMMC4 on Tegra X2) and
brings one to the connector pins for SD Card or SDIO use.
Table 9-1.
Jetson TX2 NX SDIO Pin Description
Pin #
Module Pin Name
Tegra X2 Signal
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 TX2 NX. Input is to Jetson TX2 NX. Bidir is for Bidirectional signals.
2.
The directions for SDMMC_x are true when used for these functions. Otherwise as GPIOs, the directions are bidirectional.
NVIDIA Jetson TX2 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
Usage on DevKit
Direction Pin Type
Carrier Board
Output
Not Assigned
Bidir
DG-10141-001_v1.1 | 51
CMOS –
1.8V/3.3V
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