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uvm_event wait ptrigger

uvm event wait_ptrigger


wait ptrigger example


event trigger and wait for event trigger at the same time


As seen in the previous example, triggering the event and waiting for event trigger with wait_trigger leads to race conditions and the event trigger will not get detected.

UVM_Event provides wait_ptrigger to overcome race conditions.

Below is the example with wait_ptrigger.

module uvm_events_ex;
  uvm_event ev_1; //declaring uvm_event ev_1
  
  initial begin
    ev_1 = new(); //Creating the event
    
    fork
      //process-1, triggers the event
      begin
        $display($time," Triggering The Event");
        ev_1.trigger;
      end
      
      //process-2, wait for the event to trigger
      begin
        $display($time," Waiting for the Event to trigger");
        ev_1.wait_ptrigger;
        $display($time," Event triggered");
      end
    join
  end
  initial begin
    #100;
    $display($time," Ending the Simulation");
    $finish;
  end
endmodule

 Simulator Output 


                   0 Triggering The Event
                   0 Waiting for the Event to trigger
                   0 Event triggered
                 100 Ending the Simulation

Execute the above code on