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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,t1,t2;  

  not_gate n1(.a(a),.y(nota));
  not_gate n2(.a(b),.y(notb));

  and_gate a1(.a(a),.b(notb),.y(t1));
  and_gate a2(.a(nota),.b(b), .y(t2));
  
  or_gate o1(.a(t1),.b(t2),.y(y));

endmodule

 

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