Maxim Integrated Corona (MAXREFDES12) Nexys 3 - Manual (Page 16)

Corona (MAXREFDES12#) Nexys 3 Quick Start Guide
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Verify the application is selected and press the Run button.
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 MicroBlaze. The LEDs LD7–LD0
on the Nexys 3 development board 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 7-segment LED panel
on the Nexys 3 development board displays the MAX31911 16-bit register value
in HEX format.
Change the digital input voltages to verify the register value follows the changes
properly.