1-Bit ALU Slice

Question

Problem: 1-Bit ALU Slice. Solve this hands-on electronics task on EWskills.

Accepted Answer

Step 1: Operation Selection

The circuit runs all four operations (AND, OR, XOR, and Addition) simultaneously. A multiplexer network uses the selection control lines (Op1, Op0) to choose exactly one of these computed values to pass forward as the final Result.

Step 2: Continuous Carry Calculation

The circuit calculates the carry-out (Cout) independently using standard full adder logic. Because it bypasses the selection switches, the carry signal stays continuously active, allowing multiple slices to be chained together for multi-bit addition.

Boolean Equations:

And_Result = A . B
Or_Result = A + B
Xor_Result = A ^ B
Add_Result = A ^ B ^ Cin
Cout = (A . B) + (Cin . (A ^ B))
Result = (And_Result . ~Op1 . ~Op0) + (Or_Result . ~Op1 . Op0) + (Xor_Result . Op1 . ~Op0) + (Add_Result . Op1 . Op0)

55. 1-Bit ALU Slice