I refer to the IMX6SDLRM Rev.4.
P4516 51.5 SNVS Regulator
If VDDHIGH_IN is present, then the SNVS_IN supply is internally shorted to the VDDHIGH_IN supply.
VDDHIGH_IN can be separated from SNVS_IN by setting the PMU_MISC0[discon_high_snvs] bit.
P910 CCM_ANALOG_MISC0n field descriptions (continued)
discon_high_snvs : This bit forces the short between VDDHIGH_IN and VSNVS_IN to open when asserted. This is useful in power cases where SNVS_IN > VDDHIGH_IN.
I refer to the schematic of MCIMX6DL-SDP (SPF-27417_C5.pdf).
VDDHIGH_IN_1/2 = VDDHIGH_IN = VGEN5 = 2.8V
VDD_SNVS_IN = VSNVS_3V0 = 3.0V
(SNVS_IN > VDDHIGH_IN)
Is it necessary to set PMU_MISC0[discon_high_snvs] bit when designing like MCIMX6DL-SDP?