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combine all 1.8V signal pin to ONE power source?

Other Parts Discussed in Thread: TPS650250

hi, in document"slvu731a_powering the am335x with the tps650250", there are three 1v8 power source, one powering signal  VDDS_DDR/VDDS/VDDS_RTC,  another powering signal  VDDS_SRAM_CORE_BG/VDDS_SRAM_MPU_BB/VDDA_ADC, last one for VDDS_PLL_DDR/VDDS_PLL_CORE_LCD/VDDS_PLL_MPU/VDDS_OSC/VDDAP8V_USB01.

my question is: can i use just one 1.8V power source to all those signal described above?

thanks