9. XOR Gate Using Basic Gates

How do you plan to solve it?

The approach is to implement the XOR operation using fundamental logic gates: first generate the complemented inputs, then form the two essential product terms, and finally combine them with an OR gate to obtain the exclusive-OR output.

// ============================================================
// 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 a2, b2, y1, y2;
    // TODO: instantiate required gates
    not_gate not1 (.a(a), .y(a2));
    not_gate not2 (.a(b), .y(b2));
    and_gate and1 (.a(a), .b(b2), .y(y1));
    and_gate and2 (.a(a2), .b(b), .y(y2));
    or_gate or1 (.a(y1), .b(y2), .y(y));


endmodule