ovm_push_sequencer.svh

This is OVM 2.0 source code .Very useful for developing system verilog Env

//----------------------------------------------------------------------
//   Copyright 2007-2008 Mentor Graphics Corporation
//   Copyright 2007-2008 Cadence Design Systems, Inc.
//   All Rights Reserved Worldwide
//
//   Licensed under the Apache License, Version 2.0 (the
//   "License"); you may not use this file except in
//   compliance with the License.  You may obtain a copy of
//   the License at
//
//       http://www.apache.org/licenses/LICENSE-2.0
//
//   Unless required by applicable law or agreed to in
//   writing, software distributed under the License is
//   distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
//   CONDITIONS OF ANY KIND, either express or implied.  See
//   the License for the specific language governing
//   permissions and limitations under the License.
//----------------------------------------------------------------------


typedef class ovm_sequence_base;

class ovm_push_sequencer #(type REQ = ovm_sequence_item,
                           type RSP = REQ) extends ovm_sequencer_param_base #(REQ, RSP);

  typedef ovm_push_sequencer #( REQ , RSP) this_type;

  ovm_blocking_put_port #(REQ) req_port;

  function new (string name, ovm_component parent);
    super.new(name, parent);

    req_port              = new ("req_port", this);
  endfunction // new


  task run();
    REQ t;
    integer selected_sequence;
    
    forever
      begin
        do 
          begin
            wait_for_sequences();
            selected_sequence = choose_next_request();
            if (selected_sequence == -1) begin
              wait_for_available_sequence();
            end
          end while (selected_sequence == -1);
        // issue grant
        if (selected_sequence >= 0) begin
          set_arbitration_completed(arb_sequence_q[selected_sequence].request_id);
          arb_sequence_q.delete(selected_sequence);
          m_update_lists();
        end
        m_req_fifo.get(t);
        req_port.put(t);
        m_wait_for_item_sequence_id = t.get_sequence_id();
        m_wait_for_item_transaction_id = t.get_transaction_id();
      end // forever begin
  endtask

endclass