init

code/v12_gotchas_examples.sv

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+import uvm_pkg::*;            // import the UVM library
+`include "uvm_macros.svh"     // Include the UVM macros
+
+// example transaction
+class Transaction extends uvm_sequence_item;
+
+   bit [1 : 0] addr;
+   bit [7 : 0] data;
+
+   `uvm_object_utils_begin(Transaction)
+      `uvm_field_int(addr, UVM_DEFAULT)
+      `uvm_field_int(data, UVM_DEFAULT)
+   `uvm_object_utils_end
+
+   constraint addr_data_constraint {
+      addr == 5;
+      5 < data < 10;
+   }
+
+   function new (string name = "Transaction");
+      super.new(name);
+   endfunction : new
+
+endclass : Transaction
+
+// test
+class test extends uvm_test;
+
+   `uvm_component_utils(test)
+
+   bit [2 : 0] i;
+   Transaction tr_queue[$];
+   bit         e1, e2;
+
+   function new(string name = "test", uvm_component parent = null);
+      super.new(name, parent);
+   endfunction : new
+
+   // build phase - fill tr_queue with 10 random transactions
+   function void build_phase(uvm_phase phase);
+      Transaction tr;
+      super.build_phase(phase);
+
+      `uvm_info(get_type_name(), "Starting build phase ...", UVM_HIGH)
+      tr = Transaction::type_id::create("tr");
+
+      for(i = 0; i < 10; i++) begin
+         tr.randomize();
+         tr_queue.push_back(tr);
+      end
+   endfunction : build_phase
+
+   task run_phase(uvm_phase phase);
+      `uvm_info(get_type_name(), "Starting run phase ...", UVM_HIGH)
+      phase.raise_objection(this);
+
+      fork
+         generate_random_events();
+         display_tr();
+      join_any;
+      disable fork;
+
+      phase.drop_objection(this);
+   endtask : run_phase
+
+   task generate_random_events();
+      forever begin
+         #($urandom_range(10,1)); // delay
+         if($urandom_range(1)) begin
+            `uvm_info(get_type_name(), "e1 changed...", UVM_HIGH)
+            e1 = !e1;
+         end
+         else begin
+            `uvm_info(get_type_name(), "e2 changed...", UVM_HIGH)
+            e2 = !e2;
+         end
+      end
+   endtask : generate_random_events
+
+   task display_tr();
+      Transaction tr;
+      while(tr_queue.size()) begin
+         @(e1 || e2);
+         tr = tr_queue[i];
+         `uvm_info(get_type_name(),
+                   $sformatf("Transaction: \n%s", tr.sprint()),
+                   UVM_HIGH)
+      end
+   endtask : display_tr
+
+endclass : test
+
+// top module
+module top();
+
+   initial begin
+      run_test("test");
+   end
+
+endmodule : top