Question

Design a combinational logic circuit that accepts a decimal value represented as a four-bit Aiken (or "2421") code (X3 X2 X1 X0) as its input and that creates a four-bit output (Y3 Y2 Y1 Y0) that uses standard binary (radix-2) encoding to represent the same decimal value. For each of the four outputs, construct a standard truth table with inputs X3 X2 X1 X0 appearing in order from 0000, 0001, 0010, ..., 1111. The 6 disallowed input combinations can be specified as don't cares. A separate truth table for each output signal can be constructed , or can merge the four truth tables into one truth table with four output columns for Y3 Y2 Y1 Y0.

Answer 1