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