times (since you are building a 4-bit adder). To re-emphasize, 'adder gate' is your top-level Complete the code, compile it and assign pins using switches sW[o]-SW[3] as input for the first operand, switches SW[4]-SW[7] as input for the second operand, LEDs LEDR[0]-LEDR(3] as output for the sum and LEDR[4] as output for the carry-out. Finally program the FPGA board. (Note: Refer to page 25-26 of the DE1-SoC.User, manual for pin numbers) Validate and demonstrate the functionality of your circuit. Sum Cout Cout AB + ACin +BCin Figure 7.1: Gate-level circuit diagram of 1-bit Full adder