SD Breakout Board
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For convenience we decided to create a simple breakout board with an SD Card connector in order to simply hook up SD cards to development boards using either SPI or SDIO.
Schematics
PCB
The routing of the board is quite simple.
Silkscreen
On a breakout board such as this, the silkscreen is of utmost importance. On the bottom side we have added labels for both SDIO and SPI connections: