SBC Axel SBC/Interfaces and Connectors/micro SD

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History
Version Issue Date Notes
1.0.0 Oct 2020 First DESK release


micro SD interface[edit | edit source]

Description[edit | edit source]

The micro SD interface available on the Evaluation Kit at the connector J26.

J26 is a Micro-SD card header. This interface is connected to the USDHC1 controller of the i.MX6 CPU.

microSD connector

Signals[edit | edit source]

The following table describes the interface signals:

Pin# SOM Pin# Pin name Pin function Pin Notes
1 J10.79 SD_DAT2 Data 1
2 J10.81 SD_DAT3 Data 3
3 J10.83 SD_CMD CMD
4 - 3V3 +3.3 V
5 J10.85 SD_CLK Clock
6, 12 - DGND Ground
7 J10.75 SD_DAT0 Data 0
8 J10.77 SD_DAT1 Data 1
9, 10, 11 - SD_SHIELD Shield
13 J10.177 EIM_D19 Card detect

Device mapping[edit | edit source]

The microSD card is mapped to /dev/mmcblk0. The available partitions are available as /dev/mmcblk0p1, /dev/mmcblk0p2, etc.

Device usage[edit | edit source]

The device can be mounted/accessed as a standard block device in Linux.