Maxim Integrated Corona (MAXREFDES12) ZedBoard - Manual (Page 16)

Corona (MAXREFDES12#) ZedBoard Quick Start Guide
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Once the Debug/MAXREFDES12 configuration is set up once, you just need to
press the Run button if you ever want to run the program again.
At this point, the application is running on the ARM Cortex-A9 processor. The
LEDs LD7
−LD0 on the ZedBoard indicate the voltage levels of the digital input
channels IN8
−IN0, respectively. LED ON indicates a high-voltage input, LED
OFF indicates a low-voltage input. At the same time, the OLED panel on the
ZedBoard displays the MAX31911 16-bit register value in HEX format.
Change the digital input voltages to verify the register value follows the changes
properly.