CE 433 Spring 2022
Lab 5: 2's Complement Adder
Taylor Nakai
tsnakai@fortlewis.edu

Introduction:
In this lab, we were tasked with designing a 3-bit adder/subtractor in 2's complement using the circuit shown in Figure 1. Completing these two tasks allowed us to be more comfortable with using verilog, vivado, and on board verification of a 3-bit adder/subtractor in 2's complement.


Figure 1. Circuit of 3-bit adder/subtractor in 2's complement.

Task 1:
In this task, we were tasked with using verilog and vivado to create a 3-bit adder/subtractor in 2's complement with the results being displayed using the LEDs. Figure 2 shows the code used to create the 3-bit adder/subtractor in 2's complement's code with results being shown using LEDs. Figure 3 shows the demonstration 3-bit adder/subtractor in 2's complement's using LEDs.


Figure 2. The 3-bit adder/subtractor in 2's complement's code with results being shown using LEDs.


Figure 3. Demonstration of 3-bit adder/subtractor in 2's complement's using LEDs.

Task 2:
In this task, we were tasked with using verilog and vivado to create a 3-bit adder/subtractor in 2's complement with the results being displayed using the LEDs and the seven segment display. Figure 4 shows the code used to create the 3-bit adder/subtractor in 2's complement's code with results being shown using LEDs and the seven segment display. Figure 5 shows the demonstration 3-bit adder/subtractor in 2's complement's using LEDs and the seven segment display.


Figure 4. The 3-bit adder/subtractor in 2's complement's code with results being shown using LEDs and seven-segment display.


Figure 5. Demonstration of 3-bit adder/subtractor in 2's complement's using LEDs and seven-segment display.

Discussion:
By completing this lab, we were able to gain more comfortability working with verilog, vivado, and 3-bit adder/subtractor in 2's complement. We were able to to gain more experience with on board verification and adders/subtractors. I think this was a great lab emphasizing the importance of 3-bit adder/subtractor in 2's complement. I believe that these skills will be useful in the future.  Overall, this lab was interesting and I can't wait to learn more.
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