initial begin seed = $get_initial_random_seed(); end always @(posedge clk) begin rand_num <= $random(seed); end 在上面代码中,利用系统函数得到的seed的值是1,此后seed更新后的值和$random(seed)产生的随机数序列都和将seed直接赋值成1,利用$random(seed)产生随机数的情况相同。这也是我根据经验得出...
摘自VCS_userguid---$get_initial_random_seed(用于get随机种子的值) Returns the integer number used as the seed for a simulation run, if the seed was set by +ntb_random_seed=value or by +ntb_random_seed_automatic or returns the default random seed value if the seed was not set using on...
2.例子:传递数组,并从数组中选取数据 classDays;typedefenum{SUN,MON,TUE,WED,THU,FRI,SAT}days_e;randdays_echoice;days_echoices[];constraintcday{choiceinside{choices};}endclassmoduletb;intseed;initialbeginDaysdays;days=new();seed=get_time_stamp1();days.srandom(seed);days.choices={Days::SUN,D...
在实际代码中,我们可以使用系统函数$value$plusargs结合系统的时间函数来完成种子的赋值,另一种方法是在仿真命令中加入+ntb_random_seed_automatic 选项,这样每次仿真系统会自动随机化一个新的种子。 线程及线程间的通信: •线程:即独立运行的程序。需要被触发执行,可以结束或者不结束。Initial,always都可以看作独立...
{a >0;} 7 endclass 8 9 initial begin 10 rc ua = new(); 11 for(i=0;i<10;i++) begin 12 ua.randomize(); 13 $display("%d",ua.a); 14 end 15 $display("%d",$urandom); 16 end 17 endprogram 仿真命令如下: vcs -sverilog -R test.sv +plusarg_save +ntb_random_seed_...
(2)每个Process都有自己的RNG。每个RNG都有自己的随机状态(random state)。 (3)可以通过process::self()这个静态方法获取当前Process的RNG句柄,再通过句柄调用get_randstate()方法来获得随机状态。不同的仿真工具返回来的随机状态的值的表现方式可能会不一样,但基本都是一段看起来没有规律的字符串,这个字符串表示...
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sequence and no control over the range of the random numbers. SystemVerilog adds two random number classes, “rand” and “randc,” using SystemVerilog's object class system. These classes provide methods to set seed values and to specify various constraints on the random values that are ...
Without changing any code, if we just swap the call to randomization, the output remains same. This is because, simulator assigns a RNG when the object is created and the stream of random values generated for this object will be based on this initial RNG. Example (4) illustrates this. ...
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