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Note

It is important to disable the pullups, otherwise some SD card may exhibit systematic or random problem at initialization.

 

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Correct Example settings for SDIO MIO pins , speed fast, pullup (TE0720), MIO pullups are disabled.

Level shifter

Modules that expose SDIO Interface on the B2B Connector from 1.8V VCCIO bank need SD Level shifter IC on the baseboard.

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