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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 nota, notb, h,i;
    not_gate f1( .a(a), .y(nota));
    not_gate f2 (.a(b), .y(notb));
    and_gate f3(.a(a),.b(notb),.y(h));
    and_gate f4(.a(nota),.b(b),.y(i));
    or_gate f5(.a(h),.b(i),.y(y));
endmodule

 

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