ORCA SBC/Interfaces and Connectors/micro SD

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Issue Date Notes
2021/12/10 First release

micro SD interface[edit | edit source]

Description[edit | edit source]

The micro SD interface available on the Evaluation Kit at the connector J16, labelled as uSD on the bottom.

J16 is a Micro-SD card header. This interface is connected to the USDHC2 controller of the i.MX8M Plus CPU.

micro SD connector

Signals[edit | edit source]

The following table describes the interface signals:

Pin# SOM Pin# Pin name Pin function Pin Notes
1 J15.52 SD_DAT2 Data 2
2 J15.54 SD_DAT3 Data 3
3 J15.46 SD_CMD CMD
4 - VDD +3.3 V BOARD_PGOOD driven rail with 200mA fuse
5 J15.44 SD_CLK Clock
6, 12 - VSS Ground
7 J15.48 SD_DAT0 Data 0
8 J15.50 SD_DAT1 Data 1
9, 10, 11 - SD_SHIELD Shield
13 J15.42 SD2_CD_B Card detect

Device mapping[edit | edit source]

The microSD card is mapped to /dev/mmcblk1. The available partitions are shown as /dev/mmcblk1p1, /dev/mmcblk1p2, etc.

Device usage[edit | edit source]

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