Debugging Saturating Adder
An 8-bit unsigned saturating adder is used in digital signal processing datapathes to prevent arithmetic wrap-around distortion. The circuit computes the sum of two 8-bit unsigned inputs A and B and clamps the output Sum to the maximum 8-bit value if an overflow occurs.
Expected behavior:
If A + B <= 255, the output Sum equals A + B. If A + B > 255, the output Sum saturates to 255.
Simulation shows Sum = 0 for inputs A = 255 and B = 1. The output wraps around instead of saturating to the maximum value. Inspect the circuit and correct the fault.
Constraints
- Do not change the input or output port definitions.
- Ensure the saturation logic evaluates the full precision sum before truncation.
Topics
Solve this problem
Place the gates, wire them up and watch the signals settle. Every submission runs on the same simulation engine that grades it.
This problem is part of Codiode Pro. The statement above is free to read.
The circuit builder and code editor need a desktop screen. On a phone, read the problem here and open it on a laptop to solve.