How to know if simulation is running ?

[www.testbench.in]

In Normal verification, I print a message for every 1000 clock cycles, to see if simulation really running.

Any API to do this in UVM ?

[uwes]

hi,

there is no direct API in UVM for doing this. however you can use alternate facilities to address your primary concern. as far as i understand your primary concern is that you want to be "notified" if there is no progress with your simulation.

to do that with UVM you might want to look at heartbeat feature of the objection subset. The heartbeat feature requires to send a notification to the heartbeat object within a defined time window. if the trigger is missing a simulation stop is being generated. so to some extend its not showing the progress - its rather a safeguard to prevent the simualtion from stalling.

attached is an example of that (this example is part of the uvm developer source kit, see uvm-10ea/tests/02objections/91heartbeat/*)

regards

/uwe

module test;
 import uvm_pkg::*;
 `include "uvm_macros.svh"

 class my_catcher extends uvm_report_catcher;
    int id_cnt;
    int client_cnt[uvm_report_object];
    uvm_component c;
    virtual function action_e catch();
       if(get_id()!="HBFAIL") return THROW;
       $display("MSG: %s", get_message());
       id_cnt++;
       if(!client_cnt.exists(get_client())) client_cnt[get_client()] = 0;
       client_cnt[get_client()]++;
       return CAUGHT;
    endfunction
 endclass

 uvm_objection myobj = new("myobj");

 class mycomp extends uvm_component;
   time del;
   function new(string name, uvm_component parent);
     super.new(name,parent);
   endfunction
   task run;
     repeat(10) #del myobj.raise_objection(this);
   endtask
 endclass
 class myagent extends uvm_component;
   mycomp mc1, mc2;
   function new(string name, uvm_component parent);
     super.new(name,parent);
     mc1 = new("mc1", this);
     mc2 = new("mc2", this);
     mc1.del = 45;
     mc2.del = 55;
   endfunction
 endclass
 class myenv extends uvm_component;
   uvm_heartbeat hb;
   myagent agent;

   function new(string name, uvm_component parent);
     super.new(name,parent);
     agent = new("agent", this);

     hb = new("myhb", this, myobj);
     hb.add(agent.mc1);
     hb.add(agent.mc2);
   endfunction
   task run;
     uvm_event e = new("e");
     hb.start(e);
     fork
       repeat(11) #60 e.trigger();
       #550 hb.remove(agent.mc1);
     join
     uvm_top.stop_request(); 
   endtask
 endclass

 class test extends uvm_test;
   myenv env;
   my_catcher mc;
   `uvm_component_utils(test)
   function new(string name, uvm_component parent);
     super.new(name,parent);
     env = new("env", this);
     mc = new;
     uvm_report_cb::add(null,mc);
   endfunction 
   function void report;
     uvm_report_object r;
     if(mc.id_cnt != 2) begin
       $display("** UVM TEST FAILED **");
       return;
     end
     if(mc.client_cnt.num() != 1) begin
       $display("** UVM TEST FAILED **");
       return;
     end
     r = env;
     if(mc.client_cnt[r] != 2) begin
       $display("** UVM TEST FAILED **");
       return;
     end
     if($time != 660) begin
       $display("** UVM TEST FAILED **");
       return;
     end
     $display("** UVM TEST PASSED **");
   endfunction

 endclass

 initial run_test();
endmodule

[SeanChou]

uwes,

This is a very good example to illsustrate not only heartbeat but also report_catcher, strongly suggest to collect it into the examples in the UVM package. (I searched uvm_heartbeat then being led here after giving up finding example in uvm-ea packages.)

Thanks you so much!