The opposite of what theinsideoperator does can be achieved by placing a not symbol!before it. This is applicable for both constraints and conditional statements. The following example is the same as we saw before except that its constraint has been tweaked to reflect an invertedinsidestatement. ...
constraint c_date{ month inside { [1:12] }; //约束month day inside { [1:31] }; //约束day year inside { [2010:2030] };//约束year } endclassinside是常见的约束运算符,表示变量应该属于某一个值的集合,除非述存在其他约束,否则随机变量在集合重敢值的概率是相等的。 集合里也可以使用变量。ra...
constraint常见用法rand bit [7:0] data; // 随机变量 rand bit [3:0] addr; // 随机变量 rand bit [7:0] data_array[10]; // 随机数组 constraint c_data_addr { data inside {[0:100]}; // data的取值范围是0到100 addr dist {0
module tb6; class packet_a; rand int length; constraint cstr {soft length inside {[5:15]};} endclass class packet_b extends packet_a; //constraint cstr{ length inside {[10:20]};}//与父类同名会覆盖掉packet_a的约束 //constraint cstr1 { length inside {[10:20]};}//不同名同时满足...
2 inside { some_dynamic_array }; } 相反,如果我们约束数组中不包含值2呢? constraint not_contains_c { !(2 inside { some_dynamic_array }); } 3、约束数组中每个值都是唯一的。 constraint all_elems_unique_c { unique { some_dynamic_array }; ...
// Use of multiple operators in a single expression is not allowed constraint my_error { 0 < min < typ < max < 128; } // This will set min to 16 and randomize all others constraint my_min { min == 16; } // This will set max to a random value greater than or equal to 64...
)inside{[1:8]};}endclass//使用foreach产生递增的数组元素的值classAscend;randunitd[10];constraint...
function void display (); $display ("Am not going to return any value"); endfunction ta...
SystemVerilog provides the support to use foreach loop inside a constraint so that arrays can be constrained.
The constraint is disabled by using the constraint_mode method, so on randomization constraint solver will not consider the constraint.class packet; rand bit [3:0] addr; constraint addr_range { addr inside {5,10,15}; } endclass module static_constr; initial begin packet pkt; pkt = new()...