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→MMC
=== MMC design rules ===
*MMC0 can not be used by SODIMM connector and on board uSD card reader at the same time.*MMC1 is not bootable during system boot processusing bootmode pad.
*MMC1 bus is a good option to expand memory capacities or use as a backup memory.
*MMC bus needs PU resistors to avoid unknown signals. 10K PU resistors from tied to 3V3 source to must be necessary in lines:SD1_Dx, SD1_CD and SD1_CLK must be necessary.*OptionallyOptional: low resistance resistors could be necessary to equalize bus impedances. 10R series resistors to could be necessary in lines: SD1_Dx, SD1_CD and SD1_CLK could be necessary.
== UART ==
