vivado程序示例

//full_add.v 全加器
module full_add(
    input a,
    input b,
    input carry,
    output sum,
    output count
    );

    assign {count,sum}=a+b+carry;
endmodule
//full_add_tb.v
module full_add_tb(
    );
reg a;
reg b;
reg carry;
wire sum;
wire count;

initial begin
    a=1;
    b=0;
    carry=1;
end

always begin
#({$random}%100)
   a=~a;
#({$random}%100)
    b=~b;
#({$random}%100)
    carry=~carry;
end
full_add full_add_tb(
    .carry(carry),
    .a(a),
    .b(b),
    .sum(sum),
    .count(count)
);
endmodule