私はこの16ビットキャリールックアヘッド加算器を完成させ、これが正しいかどうか教授に尋ねました。彼は私にその間違いを言った。構造Verilogを使用して作成する方法についてのアイデアを得るのに助けを求めました。誰かが私のコードの何が問題なのかを確認するのを手伝ってもらえますか?
`timescale 1ns/1ns
module fulladder(a, b, c, s, cout); //one bit fulladder
//the wires
wire w1, w2, w3, w4, s, cout;
input a, b, c;
output s, cout;
reg [0 : 0] s,cout; //register with one bit
//exclusive or gate with 1 ns delay
xor #1
g1(w1, a, b),
g2(s, w1, c);
//and gate with 1 ns delay
and #1
g3(w2, c, b),
g4(w3, c, a),
g5(w4, a, b);
//or gate with 1 ns delay
or #1
g6(cout, w2, w3, w4);
endmodule
//16bit carry look ahead
module sixteen_bit_carry_lookahead(a, b, c, s, cout);
input [15:0] a,
input [15:0] b,
input c, //Carry in
output [15:0] s, //Sum
output cout //Carry
//wires
wire [3:1] carry, [3:0] p, [3:0] g, [3:1] carry;
fulladder f0(.a(a[0]), .b(b[0]), .c(c),.s(s[0]),.cout(),.g(g[0]),.p([0]));
fulladder f1(.a(a[1]),.b(b[1]),.c(carry[1]),.s(s[1]),.cout(),.g(g[1]),.p([1]));
fulladder f2(.a(a[2]), .b(b[2]), .c(carry[2]), .s(s[2]), .cout(), .g(g[2]),.p([2]));
fulladder f3(.a(a[3]), .b(b[3]), .c(carry[3]), .s(s[3]), .cout(), .g(g[3]), .p([3]));
fulladder f4(.a(a[4]), .b(b[4]), .c(carry[4]), .s(s[4]), .cout(), .g(g[4]), .p([4]));
fulladder f5(.a(a[5]), .b(b[5]), .c(carry[5]), .s(s[5]), .cout(), .g(g[5]), .p([5]));
fulladder f6(.a(a[6]), .b(b[6]), .c(carry[6]), .s(s[6]), .cout(), .g(g[6]), .p([6]));
fulladder f7(.a(a[7]), .b(b[7]), .c(carry[7]), .s(s[7]), .cout(), .g(g[7]), .p([7]));
fulladder f8(.a(a[8]), .b(b[8]), .c(carry[8]), .s(s[8]), .cout(), .g(g[8]), .p([8]) );
fulladder f9(.a(a[9]), .b(b[9]), .c(carry[9]), .s(s[9]), .cout(), .g(g[9]), .p([9]) );
.
. //goes all the way to 16 bit
.
fulladder f15(.a(a[15]),.b(b[15]),.c(carry[15]),.s(s[15]),.cout(),.g(g[15),.p([15]));
endmodule
//the carry look ahead adder with inputs and outputs
module carry_lookahead(.p, .g, .c, .cout);
input .p(p); //input [15:0]
input .g(g); //input [15:0]
output .c(carry); //output [15:1]
output .cout (cout); //output
endmodule