2.17 LEDs
The LX2160ARDB has numerous onboard light-emitting diodes (LEDs), which can be
used to monitor various system functions, such as power on, reset, board faults, and so
on. The information collected from LEDs can be used for debugging purposes. The table
below lists all the LEDs present on the LX2160ARDB.
Table 2-18. LX2160ARDB LEDs
Reference
designator
LED color LED name Description (when LED is ON)
D1 Yellow PRELOAD The PSU-loading FET is active; it may be hot during
power-up or shortly afterward. Avoid touching this area.
D18 Blue PASS The CPLD has completed power and reset sequencing and
no errors are detected
D19 Yellow ASLEEP The processor has not exited Sleep mode, which generally
indicates:
• Improper RCW source selection
• Boot memory does not contain a valid RCW/PBL
• PLL multipliers in the RCW data are not compatible
with the fixed SYSCLK, DDRCLK, or SDCLK values
D20 Red FAIL One of the following has happened:
• A thermal over-temperature fault has occurred
• One or more power supplies have not started
• Software has set the register CTL[0] (FAIL) to
indicate a software fault
D21 Red PORST The CPLD is asserting PORESET_B to the processor and
is in the process of restarting the system
D22 Red RST REQ The processor is asserting RESET_REQ_B. This is
typically due to the reasons described for the ASLEEP
LED.
D23 Red THERM Thermal monitors have detected a thermal fault and have
shut down the system
NOTE:
Unless reprogrammed by user software, the
thermal trip point is 85 °C.
D41 Red ROTERR The processor has been installed in the socket rotated 90,
180, or 270 degrees from the pin 1 orientation. The system
and device power supplies have been shut down to protect
the device.
D24 Green M7 General status. See Multi-status LEDs for details.
D25 Green M6
D26 Green M5
D27 Green M4
D42 Green M3
D43 Green M2
D45 Green M1
D44 Green M0
Table continues on the next page...
Chapter 2 LX2160ARDB Functional Description
QorIQ LX2160A Reference Design Board Reference Manual, Rev. 0, 09/2018
NXP Semiconductors 53
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