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9. XOR Gate Using Basic Gates

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Solving Approach

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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);
    // 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 , w2 ;

    assign w1 = a & ~b ;
    assign w2 = ~a & b ;
    assign y = w1 | w2 ;

    // TODO: instantiate required gates

endmodule

 

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