// This special stimulus simulates the climbing of a mountain


  // Pressure stimulus
  //
  //  the pressure decreases as we go up the mountain
  //  and then increases again as we come back down 

  initial
    begin
      SENSOR.pressure=1013;
      start_up_delay();
      
      // quick ascent

      while ( SENSOR.pressure > 913 )
        #0.5s SENSOR.pressure--;


      // a short wait at the top
      #60s

      // even quicker descent

      while ( SENSOR.pressure < 1013 )
        #0.1s SENSOR.pressure++;
    end
  


  // Button stimulus
  //
  //  After about 5 seconds switch to vertical speed display 

  initial
    begin
      Mode = 0;
      Trip = 0;
      mode_index = 0;
      #5s  -> press_mode_button;
      #0.5s -> press_mode_button;
    end
  


  // Stimulus not changed for
  // Clock nReset and scan path signals 

  initial
    begin
      Test = 0;
      SDI = 0;
      ScanEnable = 0;
      nReset = 0;
      #(`clock_period / 4) nReset = 1;
    end

  initial
    begin
      Clock = 0;
      #`clock_period
      forever
        begin
          Clock = 1;
          #(`clock_period / 2) Clock = 0;
          #(`clock_period / 2) Clock = 0;
        end
    end