Event triggering in SV

SystemVerilog
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1

As per LRM rules of system verilog this statement should be executed but it showing same behaviour as of verilog event(not running any pkt).

module event_l;
string testname;
event e;

initial begin
#2;
wait(e.triggered);
//@(e);
case(testname)
"gd_pkt":begin
          $display("i am in good pkt");
	end
"bd_pkt":begin
	          $display("i am in bd pkt");
	end
"ill_pkt":begin
            $display("i am in ill pkt");
        end
endcase
end

initial begin
$value$plusargs("testname=%s",testname);
->e;
end
endmodule
2

In reply to rahul19190:

Please use code tags making your code easier to read. I have added them for you.

The event triggered method only returns true in the timeslot where the event in triggered. It returns false once time advances. There is a non-blocking event trigger that you can avoid a race between the two initial blogs. It works very similar to a non-blocking assignment.

module event_l;
string testname;
event e;
 
initial begin
  @(e);
  case(testname)
  "gd_pkt":begin
            $display("i am in good pkt");
          end
  "bd_pkt":begin
	    $display("i am in bd pkt");
	   end
  "ill_pkt":begin
           $display("i am in ill pkt");
            end
  endcase
end
 
initial begin
  $value$plusargs("testname=%s",testname);
  ->>e;
end
endmodule
3

In reply to dave_59:

yes @deve_59 the above thing you have mentioned is correct for verilog event(which is said to be non persistence),
But i want to check with system verilog events(which are persistence) i.e they are active throughout the simulation once event is triggered.
(please correct me if i am wrong)

so i want to use wait(e.triggered()) (i.e sv event triggering style and want to see the difference between verilog and sv events

4

In reply to rahul19190:

Please read the IEEE 1800-2017 SystemVerilog LRM section 15.5.3 Persistent trigger: triggered built-in method more carefully.

5

In reply to dave_59:
sir,
can you give me one clear idea of difference between @e and wait(e.triggered())
I gone through above given document.but still confused.