Sunday, September 28, 2008

VHDL PROGRAM OF A4020B-Test_vhd

-- ============================================================================
-- 4020B 14-Stage Binary Counter (Test Bench)
--
-- Copyright (C),2005 Andrew John Jacobs.
--
-- This program is provided free of charge for educational purposes
--
-- Redistribution and use in binary form without modification, is permitted
-- provided that the above copyright notice, this list of conditions and the
-- following disclaimer in the documentation and/or other materials provided
-- with the distribution.
--
-- THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS 'AS IS' AND ANY
-- EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-- WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
-- DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY
-- DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
-- (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
-- LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
-- ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-- (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
-- THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-- ============================================================================

library ieee;
use ieee.std_logic_1164.all;
library work;

entity A4020B_TestBench is
end entity;

-- ============================================================================

library ieee;
use ieee.std_logic_1164.all;
library work;

architecture behaviour of A4020B_TestBench is
component A4020B is
generic (
tplh : time;
tphl : time);
port (
cp_n : in std_logic;
mr : in std_logic;
o0 : out std_logic;
o3 : out std_logic;
o4 : out std_logic;
o5 : out std_logic;
o6 : out std_logic;
o7 : out std_logic;
o8 : out std_logic;
o9 : out std_logic;
o10 : out std_logic;
o11 : out std_logic;
o12 : out std_logic;
o13 : out std_logic);
end component;

signal clk_n : std_logic := '0';
signal rst : std_logic;
signal o : std_logic_vector (11 downto 0);
begin
-- Create a clock pluse
clk_n <= not clk_n after 10 ns;

-- Reset after short delay
rst <= 'U',
'1' after 20 ns,
'0' after 30 ns;

-- Connect the testbench to the component
device: A4020B
generic map (
tplh => 5 ns, tphl => 7 ns)
port map (
clk_n, rst, o(0), o(1), o(2), o(3), o(4), o(5),
o(6), o(7), o(8), o(9), o(10), o(11));
end architecture;

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