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AM6421:VDD_CORE Voltage selection

Hi,

1.VDD_ Core can use 0.75V and 0.85v power supply. What is the difference between these two voltages? What is the effect of choosing different voltages?

2.Can VDD_CORE, VDDR_CORE, VDD_MMC0,VDD_DLL_MMC0, VDDA_0P85_SERDES0, VDDA_0P85_USB0 all be powered by the same set of DC-DC (0.85V)?