UNICA SBC/Interfaces and Connectors/SD
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micro SD interface[edit | edit source]
Description[edit | edit source]
The SD interface is available on the UNICA SBC J22 connector.
J22 is a micro-SD push-push card header present on the SBC bottom side. This interface is connected to the boot SD peripheral SOM installed.
Signals[edit | edit source]
The following table describes the interface signals:
| Pin# | Pin name | Pin function | Pin Notes |
|---|---|---|---|
| 1 | DAT2 | Data 2 | |
| 2 | DAT3 | Data 3 | |
| 3 | CMD | CMD | |
| 4 | VDD | +3.3 V | |
| 5 | CLK | Clock | |
| 6 | DGND | Ground | |
| 7 | DAT0 | Data 0 | |
| 8 | DAT1 | Data 1 | |
| 10,11,12,13 | SHIELD | Connected to PCB ring through a resistor | |
| 9 | CD | Card detect |
Device mapping[edit | edit source]
The microSD card is typically mapped to /dev/mmcblkxx device in Linux (depends on the kernel's listed mmc devices order).
Device usage[edit | edit source]
The device can be mounted/accessed as a standard block device in Linux.
