LED If FAIL LED is OFF If FAIL LED is ON
Startup (power on to
power-up complete)
Normal behavior Fault code
Fault code Tier number
0100 0000
0000 0100
Tier 3 => SD_SVDD,
SD_OVDD
0101 0000 0000
0101
Tier 4 => GVDD, VTT1,
VTT2, EVDD
The LX2160ARDB power up voltage sequence diagram (LX2160ARDB Reference Manual) lists the power
supplies assigned to each tier.
NOTE
Table 25. Power Sequencer state
State LED: M[7:4] Description
IDLE 1110 = 0xE Waiting for power-on events (for example, switch)
WAIT_ATX 0000 = 0x0 Waiting for ATX PSU to report stable
EN_TIER1 0001 = 0x1 Enable tier 1 PSUs, wait for tier 1 power-good reports
EN_TIER2 0010 = 0x2 Enable tier 2 PSUs, wait for tier 2 power-good reports
EN_TIER3 0011 = 0x3 Enable tier 3 PSUs, wait for tier 3 power-good reports
EN_TIER4 0100 = 0x4 Enable tier 4 PSUs, wait for tier 4 power-good reports
WAIT_ALL 0110 = 0x6 Wait for all unmanaged PSUs to report power-good
PG_FAIL 0111 = 0x7 All power supplies were not stable within 1800*30 ns after the last
power was enabled
STABLE 1000 = 0x8 Power sequencing complete. Wait for power-off events.
DISABLE 1101 = 0xD Disable tiers 4..1 PSUs, in that order, with 1 ms delay
FAULT 1111 = 0xF Fault occurred. Power supplies were shut down due to thermal
faults or die rotation errors.
Table 26. Reset Sequencer state
State LED: M[3:0] Description
IDLE 0000 = 0x0 Waiting for initial reset events
RECONFIG 0010 = 0x2 Update configuration from registers
Table continues on the next page...
NXP Semiconductors
LX2160ARDB Functional Description
QorIQ LX2160A Reference Design Board Reference Manual, Rev. 4, 07/2020
Reference Manual 48 / 116
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