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| class rand_cls;
rand bit[2:0] rand_val;
constraint c_rand_val {rand_val == 1;}
endclass
module tb;
rand_cls rand_pkg;
initial begin
rand_pkg = new();
$display("default constraint_mode:%0d", rand_pkg.c_rand_val.constraint_mode());
for (int i = 0; i < 10; i++) begin
rand_pkg.randomize();
$display("rand_val:%0d", rand_pkg.rand_val);
end
$display("disable constraint mode");
rand_pkg.c_rand_val.constraint_mode(0);
$display("constraint_mode:%0d", rand_pkg.c_rand_val.constraint_mode());
for (int i = 0; i < 10; i++) begin
rand_pkg.randomize();
$display("rand_val:%0d", rand_pkg.rand_val);
end
end
endmodule
|