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9. XOR Gate Using Basic Gates

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Code

// ============================================================
// 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 not_a, not_b, w1, w2;

    not_gate g1( .a(a), .y(not_a) );
    not_gate g2( .a(b), .y(not_b) );

    and_gate g3( .a(a), .b(not_b), .y(w1) );
    and_gate g4( .a(not_a), .b(b), .y(w2) );

    or_gate g5( .a(w1), .b(w2), .y(y) );

endmodule

 

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