Subversion Repositories qaz_libs

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//// Copyright (C) 2018 Authors and OPENCORES.ORG                 ////

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//////////////////////////////////////////////////////////////////////

class fifo_driver

  extends uvm_driver #(fifo_sequence_item);

   `uvm_component_utils(fifo_driver)

  // --------------------------------------------------------------------

  virtual fifo_if #(.W(W), .D(D)) vif;

  //--------------------------------------------------------------------

  function void set_default;

    vif.cb.wr_en <= 0;

    vif.cb.rd_en <= 0;

    vif.cb.wr_data <= 'x;

  endfunction: set_default

  //--------------------------------------------------------------------

  virtual task run_phase(uvm_phase phase);

    fifo_sequence_item item;

    super.run_phase(phase);

    set_default();

    forever

    begin

      wait(~vif.cb.reset);

      vif.zero_cycle_delay();

      seq_item_port.get_next_item(item);

      repeat(item.delay) @(vif.cb);

      if((item.command == FIFO_WR) || (item.command == FIFO_BOTH))

      begin

        if(vif.wr_full)

          `uvm_error(get_name(), "writing to full FIFO!")

        vif.cb.wr_data <= item.wr_data;

        vif.cb.wr_en <= 1;

      end

      if((item.command == FIFO_RD) || (item.command == FIFO_BOTH))

      begin

        if(vif.rd_empty)

          `uvm_error(get_name(), "reading empty FIFO!")

        item.rd_data = vif.cb.rd_data;

        vif.cb.rd_en <= 1;

      end

      @(vif.cb);

      item.wr_full = vif.wr_full;

      item.rd_empty = vif.rd_empty;

      item.count = vif.count;

      set_default();

      seq_item_port.item_done();

    end

  endtask : run_phase

  //--------------------------------------------------------------------

  function new(string name, uvm_component parent);

    super.new(name, parent);

  endfunction

// --------------------------------------------------------------------

endclass : fifo_driver