4-bit comparator X61860

Design a circuit that compares two 4-bit numbers represented in binary code and indicates whether the first is greater than, equal to or smaller than the second.

Specification

module cmp4(a, b, eq, gt, lt);
    input [3:0] a, b;
    output eq, gt, lt;

Hint

Design a 1-bit comparator that receives the result of the comparison of the least-significant bits. Use four instances of this circuit.

Input

• a and b are the two 4-bit input numbers.

Output

• eq indicates that a=b.

• gt indicates that a$>$b.

• lt indicates that a$<$b.