UVM_EVENT control in sequence

UVM
,
1

Hi,
I want to trigger a uvm_event after the second “uvm_do_with” statement executed. but now, the uvm_event and the first “uvm_do_with” statement execute at the same time.
what should i do ?


`ifndef MPU_START_SEQUENCE__SV
`define MPU_START_SEQUENCE__SV

class mpu_start_sequence extends uvm_sequence #(mpu_start_item);

  `uvm_object_utils(mpu_start_sequence)

  rand bit          seq_en;
  rand bit[31:0]    seq_addr;

  uvm_event START_EV  = uvm_event_pool::get_global("START_EV");

  extern function new(string name = "mpu_start_sequence");
  extern virtual task body();

endclass


function mpu_start_sequence::new(string name = "mpu_start_sequence");
  super.new(name);
  set_automatic_phase_objection(1);
endfunction


task mpu_start_sequence::body();

    begin
      `uvm_do_with(req, {en == 1; addr == 0;});
      `uvm_do_with(req, {en == 0;});
    end

    START_EV.trigger();

endtask

`endif

Best regards,
lipeng yang

2

In reply to yanglp:
I don’t see how that is possible, Your code is the same as


task mpu_start_sequence::body();
   `uvm_do_with(req, {en == 1; addr == 0;});
   `uvm_do_with(req, {en == 0;});
    START_EV.trigger();
endtask
3

In reply to dave_59:

I found the problem, is my mistake.
The use of wait_on() is improper in passive monitor, result in scoreboard get invalid transaction.
Now, the complete code is as follow


`ifndef MPU_START_SEQUENCE__SV
`define MPU_START_SEQUENCE__SV

class mpu_start_sequence extends uvm_sequence #(mpu_start_item);

  `uvm_object_utils(mpu_start_sequence)

  uvm_event START_EV  = uvm_event_pool::get_global("START_EV");

  extern function new(string name = "mpu_start_sequence");
  extern virtual task body();

endclass


function mpu_start_sequence::new(string name = "mpu_start_sequence");
  super.new(name);
  set_automatic_phase_objection(1);
endfunction


task mpu_start_sequence::body();

    `uvm_do_with(req, {en == 1; addr == 0;});
    `uvm_do_with(req, {en == 0;});
    
    START_EV.trigger();

endtask

`endif



`ifndef MPU_STOP_MONITOR__SV
`define MPU_STOP_MONITOR__SV
class mpu_stop_monitor extends uvm_monitor;

  `uvm_component_utils(mpu_stop_monitor)

  virtual mpu_stop_if VIF;

  uvm_analysis_port #(mpu_stop_item) ap;

  uvm_event START_EV  = uvm_event_pool::get_global("START_EV");

  extern function new(string name, uvm_component parent);
  extern task main_phase(uvm_phase phase);

endclass

function mpu_stop_monitor::new(string name, uvm_component parent);
  super.new(name, parent);
  ap = new("ap", this);
endfunction

task mpu_stop_monitor::main_phase(uvm_phase phase);
  mpu_stop_item item;
  mpu_stop_item cloned_item;

  item = mpu_stop_item::type_id::create("item");

  START_EV.wait_on();
  forever begin

    @(VIF.icb) begin
      item.a = VIF.icb.a;
    end

    $cast(cloned_item, item.clone());
    ap.write(cloned_item);
  end


endtask

`endif



`ifndef MFETCH_SCOREBOARD__SV
`define MFETCH_SCOREBOARD__SV
class mfetch_scoreboard extends uvm_scoreboard;

  `uvm_component_utils(mfetch_scoreboard)

  uvm_blocking_get_port #(mpu_stop_item)                   gp_mpu_stop_agt;
  uvm_blocking_get_port #(mpu_stop_item)                   gp_mpu_stop_mdl;

  mpu_stop_item    expect_mpu_stop_item, actual_mpu_stop_item;

  uvm_event START_EV  = uvm_event_pool::get_global("START_EV");

  extern function new(string name, uvm_component parent);
  extern task main_phase(uvm_phase phase);

endclass


function mfetch_scoreboard::new(string name, uvm_component parent);
  super.new(name, parent);

  gp_mpu_stop_agt            = new("gp_mpu_stop_agt", this);
  gp_mpu_stop_mdl            = new("gp_mpu_stop_mdl", this);

endfunction


task mfetch_scoreboard::main_phase(uvm_phase phase);

  actual_mpu_stop_item  = mpu_stop_item::type_id::create("actual_mpu_stop_item", this);

  fork
    forever begin
      gp_mpu_stop_agt.get(actual_mpu_stop_item);

      if(actual_mpu_stop_item.a == 1) begin
        `uvm_info(get_type_name(), "MFetch Simulation End Due to Stop Instruction.", UVM_LOW)
        $stop;
      end
    end
	forever begin
	
	end
  join
endtask

`endif

thanks dave.

lipeng yang