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
);
    // TODO: declare intermediate wires
    wire w1,w2, a1, b1;
    // TODO: instantiate required gates
    not_gate na(.a(a), .y(a1));
    not_gate nb (.a(b), .y(b1));
    and_gate and1 (.a(a), .b (b1), .y(w1));
    and_gate and2 (.a(a1), .b (b), .y(w2));
    or_gate or1 (.a(w1), .b(w2), .y(y));
endmodule