delay.vhd

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--**************************************************************
--*                                                            *
--*     The source code for the ATLAS BCM "AAA" FPGA is made   *
--*     available via the GNU General Public License (GPL)     *
--*     unless otherwise stated below.                         *
--*                                                            *
--*     In case of problems/questions/bug reports etc. please  *
--*     contact michael.niegl@cern.ch                          *
--*                                                            *
--**************************************************************

--**************************************************************
--*                                                            *
--*  $Source: /local/reps/bcmfpga/bcm_aaa/bcm_aaa/div/delay.vhd,v $
--*  $Revision: 1.6.2.3 $                                          *
--*  $Name: dev $                                                 *
--*  $Author: mniegl $                                         *
--*  $Date: 2008/11/03 17:57:45 $                              *


--*                                                            *
--**************************************************************

library ieee;

use ieee.std_logic_1164.all;

use ieee.std_logic_arith.all;

use ieee.std_logic_unsigned.all;


entity delay is
  generic (i : integer range 0 to 99 := 00
           );
  port (A     : in  std_logic;
        A_DEL : out std_logic;
        CLK   : in  std_logic;
        RES   : in  std_logic
        );
end delay;


architecture delay_arc of delay is

  signal shift : std_logic_vector(99 downto 0) := (others => '0');

begin


  delay_signal : process(CLK)
  begin
    if CLK'event and CLK = '1' then
      if RES = '1' then
        shift <= (others => '0');
        A_DEL <= '0';
      else
        shift <= shift(98 downto 0) & A;
        A_DEL <= shift(i);
      end if;
    end if;
  end process delay_signal;
  
end delay_arc;

---

Author: M.Niegl

Generated on Tue Nov 4 00:47:04 2008 for BCM-AAA by  1.5.7.1-20081012