Hi Ajinkya
please look at Chapter 37 Power Management Unit (PMU) i.MX6UL Reference Manual
http://www.nxp.com/docs/en/reference-manual/IMX6ULRM.pdf
Hardware Development Guide for the i.MX 6UltraLite Applications Processor
https://www.nxp.com/docs/en/user-guide/IMX6ULHDG.pdf
Best regards
igor
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