[SOLVED] Cda 4203l spring 2025 computer system design lab lab 1 – schematic capture

Objectives: To learn and practice schematic entry and simulation.
Problem: Implement an ALU (Arithmetic Logic Unit) satisfying the following functional
requirements. You should complete schematic capture tutorial (Tutorial_Lab1.pdf), before you
start on this lab.
Figure 1: ALU Port Interface and Function Table
Implement your design in two’s complement signed system, discard the end-round carry. Do not
use the cases that lead to overflow, i.e., adding two positive or adding two negative numbers
(sometimes), and subtracting a positive and a negative number and vice versa (sometimes).
– Invert example: 1101 will be 0010
– Add example: 0110 (which is +6) + 0001 (which is +1)=0111 (+7)
– Add example: 0111 (which is +7) + 0001 (which is +1) gives 1000 (-8), overflow
– Add example: 1111 (-1) + 0111 (+7) = 0110 (+6)
– Subtract example: 1111 (-1) – 1110 (-2) = 0001 (+1)
– Subtract example: 0001 (+1) – 1000 (-8), gives 1001, overflow
1. (10 pts) Design and create a schematic of the ALU using ISE Schematic Entry tool.
2. (10 pts) Create a test bench and use it to test the ALU functionality. Include at least two test
vectors per 4 functions in the table above.
Deliverables: A concise report that includes your design and simulation results.
Function Select (S)
S1 S0 Y
Invert all bits 0 0 A
Add 0 1 A + B
Subtract 1 0 A – B
Double 1 1 2*A
A
A L U Y
S
4
2
4
B 4

Report Organization (A template is provided on Canvas –Lab 1 Report Template.docx):
□ Cover sheet
□ ALU schematic, you need to show the top level and also inside of all your blocks including
full adder, MUX, etc. You need to show screenshots of all the blocks and the details inside.
□ Brief description of your design
□ Simulation waveforms
□ Feedback: Hours spent, Exercise difficulty (Easy, Medium, Hard)

Important:
□ Do not discard your design. It will be used as starting point for subsequent lab exercise(s).
□ You need to submit your report on Canvas in PDF format. No hardcopy is needed.