NXP Semiconductors QorIQ LS1028A Reference Manual page 20

Power supplies
2.2.3 Power supply sequence
The LS1028ARDB board is configured to switch ON automatically when the 12 V power
supply is switched ON and is connected to jack (J1) on the board.
The 12 V input can be subsequently power cycled using the following events:
• The power switch (push button) is pressed
• The register bit, PWR_CTL2[PWR], is set to '1' using the I2C or JTAG/CCS
communication paths
On the availability of 12 V supply to the power regulators, the orderly enable of all power
supplies are sequenced using powergood of the regulators, as shown in the following
figure.
QorIQ LS1028A Reference Design Board Reference Manual, Rev. A, 02/2018
20
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NXP Semiconductors