Sending data from monitor to sequence

chr_sue · December 8, 2018, 12:35pm

In reply to nani9483:

Please try this.
In your monitor:

class monitor extends uvm_monitor;
  my_transaction req;
  uvm_event_pool ev_pool = uvm_event_pool::get_global_pool();
  ...
  task run_phase(uvm_phase phase);
    req = my_transaction::type_id::create("req");
    req.<data_members>; //assemble your transaction

    uvm_event ev = ev_pool.get("mon_ev");
    ev.trigger(req);
   .....
  endtask
endclass

In your sequence:

class my_sequence extends uvm_sequence #(my_transaction);
  uvm_event_pool ev_pool = uvm_event_pool::get_global_pool();
  ...
  task body();
    my_transaction req;
    req = my_transaction::type_id::create("req");
    uvm_event ev = ev_pool.get("mon_ev");
    ev.wait_trigger();
    $cast(req, ev.get_trigger_data()); 
   ....
  endtask

SV_UVM_Learner1 · December 10, 2018, 4:47am

Hi chr_sue,

Thanks a lot for your quick response. I’ll try this code once the DUT is ready.
Can I use the same procedure to send data from passive monitor to active monitor via uvm_event_pool??

chr_sue · December 13, 2018, 8:13am

In reply to SV_UVM_Learner:

This works for any component you want to send data.

SV_UVM_Learner1 · December 13, 2018, 9:02am

Okay chr_sue,

Thanks a lot.

SV_UVM_Learner1 · December 17, 2018, 12:39pm

Hi chr_sue,

I tried this logic in my passive monitor and my sequence. In my passive monitor, I kept a display message after triggering the data, and I’m getting that display message. I tried the same logic in my sequence too. But my simulation is blocking, after getting the display message from my passive monitor. Please help me.

I’ve a doubt. Do we need to use the same transaction class handle in both monitor and sequence (in this case, it’s “req”), while using this event_pool ??

SV_UVM_Learner1 · December 17, 2018, 1:35pm

// --------------------- monitor run phase method ------------------------ //

task run_phase(uvm_phase phase);
	//forever
		begin
			txn = rx_txn ::type_id::create("txn");
                            txn.array = {10,20,30,40,50}; //assigning some dummy data to my transaction class, as DUT is not yet ready!
		
	 `uvm_info("RX_MON_DATA", $sformatf("DATA sending from RX MONITOR is : [%p] \n", txn.array),UVM_LOW) // data {10,20,30,40,50} is printing
            ev = ev_pool.get("mon_ev");
            //uvm_event ev = ev_pool.get("mon_ev");
                ev.trigger(txn);
              `uvm_info("TRIGGER_DATA", $sformatf("DATA triggered in  RX Monitor"),UVM_LOW) //This display is printing , after that simulation is getting blocked/hanged!! 

		end
endtask : run_phase

// --------------------- sequence ------------------------ //

class rx_reset_seq extends rx_base_seq;
uvm_event_pool ev_pool = uvm_event_pool::get_global_pool();
uvm_event ev;

`uvm_object_utils(rx_reset_seq)

function new(string name = "rx_reset_seq");
	super.new(name);
            ev=new("ev");
endfunction

task body();
	req = rx_txn ::type_id::create("req");
            //uvm_event ev = ev_pool.get("mon_ev");
            ev = ev_pool.get("mon_ev");
           	start_item(req);
	assert(req.randomize());
	finish_item(req);
            ev.wait_trigger();
            $cast(req, ev.get_trigger_data());

// How to print my data here ?? ie., how can I print my sent data here ?? ie., {10,20,30,40,50}
endtask : body

endclass

Hi chr_sue,
Please see my code, and help me, if I’m doing wrong …
Do we need to create a separate class for uvm_event by extending from uvm_object ?? or not necessary ??
Anticipating a favourable reply from you at the earliest.

chr_sue · December 17, 2018, 2:52pm

In reply to SV_UVM_Learner:

Please try this code. It is only slidely modified:

// --------------------- monitor run phase method ------------------------ //
class driver extends uvm_driver #(txn);

  ....
  uvm_event_pool ev_pool = uvm_event_pool::get_global_pool();

task run_phase(uvm_phase phase);
//forever
  begin
    txn = rx_txn ::type_id::create("txn");
    txn.array = {10,20,30,40,50}; //assigning some dummy data to my transaction class, as DUT is not yet ready!

    `uvm_info("RX_MON_DATA", $sformatf("DATA sending from RX MONITOR is : [%p] \n", txn.array),UVM_LOW) // data {10,20,30,40,50} is printing
    uvm_event ev = ev_pool.get("mon_ev");  //creates the event "mon_event" 
    ev.trigger(txn);
    `uvm_info("TRIGGER_DATA", $sformatf("DATA triggered in RX Monitor"),UVM_LOW) //This display is printing , after that simulation is getting blocked/hanged!!

  end
endtask : run_phase

// --------------------- sequence ------------------------ //

class rx_reset_seq extends rx_base_seq;
  uvm_event_pool ev_pool = uvm_event_pool::get_global_pool();
  uvm_event ev;

  `uvm_object_utils(rx_reset_seq)

  function new(string name = "rx_reset_seq");
    super.new(name);
  endfunction

task body();
  req = rx_txn ::type_id::create("req");
  //uvm_event ev = ev_pool.get("mon_ev");
  ev = ev_pool.get("mon_ev");
  start_item(req);
  assert(req.randomize());
  finish_item(req);
  ev.wait_trigger();
  $cast(req, ev.get_trigger_data());
  `uvm_info("DATA FROM MON", $sformatf("DATA received from RX MONITOR is : [%p] \n", req.array),UVM_LOW) 
endtask : body

endclass

SV_UVM_Learner1 · December 17, 2018, 3:06pm

Thanks a lot for your quick response.
Can we use different transaction class handles in monitor and sequence?? Like here, txn in monitor and req in sequence??

chr_sue · December 17, 2018, 3:34pm

In reply to SV_UVM_Learner:

txn and req are only the names. We have to use the same types.

SV_UVM_Learner1 · December 18, 2018, 5:07am

Hi chr_sue,

I’ve used the above code. Still the simulation is getting blocked. After getting the display message from passive monitor, simulation is getting blocked.

Is there any alternate method to pass data from my passive monitor my active agent’s sequence ?? Can we use TLM ports in this scenario ??

chr_sue · December 18, 2018, 7:45am

In reply to SV_UVM_Learner:

You should find out why the simulation is blocked. Did you receive the expected data in the sequence?

SV_UVM_Learner1 · December 18, 2018, 8:38am

No, I haven’t received the expected data in my sequence.

chr_sue · December 18, 2018, 9:43am

In reply to SV_UVM_Learner:

Looks like you did not see the event. This might be the reason. Could you check for this, displaying the event in your waves window.

SV_UVM_Learner1 · December 18, 2018, 11:16am

OK. I’ll check it and update you.

Is there any alternate method to pass data from my passive monitor my active agent’s sequence ?? Can we use TLM ports in this scenario ??

chr_sue · December 18, 2018, 12:16pm

In reply to SV_UVM_Learner:

Of course you can use a port/export TLM mechanism. But this is not a good solution. Events and barriers are dedicated for synchronisation across several agents.

chr_sue · December 18, 2018, 9:14pm

In reply to SV_UVM_Learner:

OK. I’ll check it and update you.
Is there any alternate method to pass data from my passive monitor my active agent’s sequence ?? Can we use TLM ports in this scenario ??

I can give you a working example for your problem. Please give me an email address.

SV_UVM_Learner1 · December 21, 2018, 11:48am

Hi chr_sue,

Thanks a lot for your continuous support. I’ve achieved my task of sending data from my RX Passive monitor to TX sequence and also to TX Monitor by using uvm_event_pool.

shlok13 · December 21, 2018, 5:15pm

In reply to SV_UVM_Learner:

can you please send your testbench , or code itself ?? . I also want to achieve same thing , but failed to understand , how to do it ?
YOUR testbench might be of great help

chr_sue · December 21, 2018, 8:46pm

In reply to DV@Engineer :

Could you please explain what your problem is? I think you have seen my contributions above. This works.

haykp · January 14, 2019, 6:06am

In reply to SV_UVM_Learner:

Another solution:

In passive agent there is a monitor, which has analysis port.
So from your active agent, subscribe to to that analysis port and get the data from that port.

you can keep and analysis port reference in config db.