class packet; soft constraint name1 ...; 控制随机哪些变量class test_class; bit [7:0] a; rand bit [7:0] b,c; test_class t1; t1=new(); t1.b.rand_mode(0); assert(t1.randomize());//随机c,不随机b assert(t1.randomize(c));//只随机c assert(t1.randomize(a));//只随机a,非...
module tb7; class packet1; rand bit[7:0] x; constraint cstr {soft x == 5;} endclass class packet2; bit[7:0] x = 10; function int get_rand_x(input bit[7:0] x = 20); packet1 pkt = new(); //pkt.randomize with {x == x;};//默认为5 //pkt.randomize with {x == lo...
12.4 Constraint blocks .13212.5 Randomization methods .14512.6 In-line constraints — randomize() with..14712.7 Disabling random variables with rand_mode() 14812.8 Controlling constraints with constraint_mode() ..14912.9 Dynamic constraint modification15012.10 In-line random variable control ..15012.11...
with limits on the value sizes. A constraint on the address ensures that the lower two bits of random address value will always be zero. The class is then used to generate 50 random address/data value pairs, using the randomize() method, which is part of ...
SystemVerilog Tutorial for beginners with eda playground link to example with easily understandable examples codes Arrays Classes constraints operators cast
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Disable MDNS on wired ethernet (Avahi) /etc/avahi/avahi-daemon.conf and add the interface to deny-interfaces With the network configuration above, and removing MDNS (Avahi), you now get a very quiet interface: Just a few ARP announcements. Then you can just use arping to generate random ...
constraint 通常定义在class中, 在class中定义好后,执行randomize()函数, randomize函数会在new时随机所有的random变量。 如果想要不让constraint生效,控制方式: 想要让整体的contraint 不生效, 使用: constraint_mode()进行控制. 只想让某个rand 变量不再受到constraint控制, 使用: rand_mode()进行控制。
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