The constraint usesforeachloop to iterate over all the elements and assign the value of each element to that of its index. classABC;randbit[3:0]array[5];// This constraint will iterate through each of the 5 ele
此外,还添加了循环控制、continue 和 return,使我们不再需要为相同目的使用 disable 语句。 // C-style for-loop for (int i = 0; i < 8; i++) begin // initialization of 2-state logic byte count = 8; if (input[i]) begin // pre-decrement operator --count; // C-style loop control c...
rand bit[6:0] b; //0 <= b <= 127 rand bit[5:0] e; //0 <= b <= 63 constraint c_range{ b inside{[$:4],[20:$]}; //左边$为0,右边$为127 //0 <=b <=4 || 20 <= b <= 127 e inside{[$:4],[20:$]}; //左边$为0,右边$为63. //0 <=e <=4 || 20 <= ...
第三种方法使用SystemVerilog自带的随机函数来生成递增/递减数组,这时就可以不用使用constraint来实现,并且直接在program/module中的initial block中实现。 program rnd_arr_3;rand int arr3[];int arr_size;initial begin arr_size=$urandrange(6,12);arr3=new(arr_size);foreach(arr3[i])begin arr3[i]=$u...
constraint c4!{v inside fives}; (8)weighted distribution:dist property1: They are a relational test for test membership property2: They specify a statistical distribution function for the result := <===the same value in the rangeevery(可以对一个区间也可以对一个独立的数) /...
Constraint distribution operators External constraints Covergroups Coverpoints Coverpoint bins & labels Cross coverage Covergroup options Coverage capabilities Introduction to Virtual - three types of "virtual" Virtual/abstract classes Legal & illegal virtual class usage Virtual class methods & restrictions Virt...
SystemVerilog Tutorial for beginners with eda playground link to example with easily understandable examples codes Arrays Classes constraints operators cast
12.4 Constraint blocks .132 12.5 Randomization methods .145 12.6 In-line constraints — randomize() with..147 12.7 Disabling random variables with rand_mode() 148 12.8 Controlling constraints with constraint_mode() ..149 12.9 Dynamic constraint modification150 ...
随机约束可以显示地在类中进行声明,如例10-19所示,声明以关键字constraint开始,并显式声明约束名称。在约束名称之后是具体的约束条件,以“{}”来界定。 SystemVerilog允许在代码中使用randomize时添加一个额外的约束对对象进行随机化,这就是所谓的内联约束。该约束采用关键字“randomize with”实现。当约束的内容过长...
随着FPGA和ASIC开发的规模越来越大,功能越来越复杂,对验证和开发的要求越来越高,systemverilog无论在开发还是在验证上都有verilog/vhdl无可比拟的优越性。该文档是systemverilog标准的中文版,具有相当高的参考价值。 上传者:rhett_butler时间:2011-11-19