Full Adder Using NAND Gate (Structural Modeling):

Full Adder Using NAND Gate (Structural Modeling):

module fa_nand( input a,    input b,    input cin,  output sum,    output carry);

wire w1,w2,w3,w4,w5,w6,w7;

nand n1(w1,a,b);

nand n2(w3,a,w1);

nand n3(w2,w1,b);

nand n4(w4,w3,w2);

nand n5(w5,w4,cin);

nand n6(w6,w4,w5);

nand n7(w7,w5,cin);

nand n8(carry,w5,w1);

nand n9(sum,w6,w7);

endmodule