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);
    // write code here for or gate
    assign y = a | b;
endmodule

module not_gate(input a, output y);
    // write code here for not gate
    assign y = ~a;
endmodule

// ============================================================
// XOR Gate
// ============================================================
module xor_gate (
    input  a, b,
    output y
);
    // TODO: declare intermediate wires
    wire w1, ww2, w3, w4;

    // TODO: instantiate required gates
    not_gate n1(a, w1);
    not_gate n2(b, w2);
    and_gate a1(a, w2, w3);
    and_gate a2(b, w1, w4);
    or_gate o1(w3, w4, y);

endmodule