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[/] [System09/] [trunk/] [rtl/] [VHDL/] [Flasher.vhd] - Blame information for rev 114

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1 100 davidgb
--===========================================================================--
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--                                                                           --
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--                    LED Flasher                                            --
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--                                                                           --
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--===========================================================================--
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--
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--  File name      : flasher.vhd
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--
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--  Entity name    : flasher
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--
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--  Purpose        : Implements a long counter used to flash a LED
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--                   to indicate code has loaded correctly
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--
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--  Dependencies   : ieee.std_logic_1164
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--                   ieee.numeric_std
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--                   ieee.std_logic_unsigned
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--                   unisim.vcomponents
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--
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--  Author         : John E. Kent
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--
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--  Email          : dilbert57@opencores.org      
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--
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--  Web            : http://opencores.org/project,system09
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--
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--
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--  Copyright (C) 2010 John Kent
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--
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--  This program is free software: you can redistribute it and/or modify
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--  it under the terms of the GNU General Public License as published by
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--  the Free Software Foundation, either version 3 of the License, or
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--  (at your option) any later version.
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--
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--  This program is distributed in the hope that it will be useful,
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--  but WITHOUT ANY WARRANTY; without even the implied warranty of
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--  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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--  GNU General Public License for more details.
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--
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--  You should have received a copy of the GNU General Public License
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--  along with this program.  If not, see <http://www.gnu.org/licenses/>.
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--
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--===========================================================================--
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--                                                                           --
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--                              Revision  History                            --
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--                                                                           --
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--===========================================================================--
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--
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-- Version Author        Date         Changes
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--
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-- 0.1     John Kent     2010-08-28   Made separate module
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--
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library ieee;
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  use ieee.std_logic_1164.all;
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  use ieee.numeric_std.all;
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  use ieee.std_logic_unsigned.all;
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library unisim;
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  use unisim.vcomponents.all;
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-----------------------------------------------------------------------
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--                    Entity for B3_SRAM                             --
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-----------------------------------------------------------------------
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entity flasher is
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  port (
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    clk      : in  std_logic;           -- Clock input
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    rst      : in  std_logic;           -- Reset input (active high)
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    LED      : out Std_Logic            -- LED output        
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  );
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end flasher;
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--================== End of entity ==============================--
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-------------------------------------------------------------------------------
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-- Architecture for Flasher
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-------------------------------------------------------------------------------
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architecture rtl of  flasher is
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-- Flashing LED test signals
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signal countL       : std_logic_vector(23 downto 0);
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begin
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--
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-- LED Flasher to indicate code has loaded
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--
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my_LED_Flasher : process (clk, rst, CountL )
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begin
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  if falling_edge(clk) then
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    if rst = '1' then
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      countL <= (others=>'0');
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    else
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      countL <= countL + 1;
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    end if;
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  end if;
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  LED <= countL(23);
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end process;
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end rtl;

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