Four-Bit Bus Adder
Buses collapse a fistful of parallel wires into one labelled lane — the first step from toy gates toward datapaths. Instead of wiring four full adders by hand, a single bus adder consumes two 4-bit operands whole.
Build a circuit that adds two 4-bit numbers A and B with a carry-in CIN, producing the 4-bit sum S and the carry-out COUT.
{S, COUT} = A + B + CIN
The sum wraps modulo 16; any overflow beyond bit 3 appears on COUT.
Constraints
- Use the Bus Adder component from the Arithmetic palette group.
- The bus inputs
A,Band the bus outputSare already placed at 4-bit width — connect them, don't recreate them.
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.
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