9. XOR Gate Using Basic Gates

How do you plan to solve it?

// ============================================================
// Basic Gates (given)
// ============================================================
module and_gate(input a, b, output y);
    assign y = a & b;
endmodule

module or_gate(input a, b, output y);
    assign y=a|b;

endmodule

module not_gate(input a, output y);
    assign y=~a;

endmodule

// ============================================================
// XOR Gate
// ============================================================
module xor_gate (
    input  a, b,
    output y
);
    wire ab,bb,f1,f2;
    not_gate n1(b,bb);
    and_gate a1(a,bb,f1);
    not_gate n2(a,ab);
    and_gate a2(ab,b,f2);
    or_gate o1(f1,f2,y);

endmodule