The push button is connected to the PB input (pin V16). as detailed in the following table.
Signal
FPGA pin
FPGA ball
PB
IP(bank 2)
V16
The input is normally low. The input is pulled up when pressed.
The LED is lit when the U_LED line (pin R10) is set high as detailed in the following table.
U_LED
IO_L15P_2(bank 2)
R10