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Contents
micro SD interfaceEdit
DescriptionEdit
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.
SignalsEdit
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 mappingEdit
The microSD card is mapped to /dev/mmcblk1. The available partitions are shown as /dev/mmcblk1p1, /dev/mmcblk1p2, etc.
Device usageEdit
The device can be mounted/accessed as a standard block device in Linux.