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--------------------------------------------------------------------------------
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-- This sourcecode is released under BSD license.
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-- This sourcecode is released under BSD license.
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-- Please see http://www.opensource.org/licenses/bsd-license.php for details!
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-- Please see http://www.opensource.org/licenses/bsd-license.php for details!
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--------------------------------------------------------------------------------
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--------------------------------------------------------------------------------
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--
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--
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-- Copyright (c) 2010, Stefan Fischer <Ste.Fis@OpenCores.org>
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-- Copyright (c) 2010, Stefan Fischer <Ste.Fis@OpenCores.org>
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-- All rights reserved.
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-- All rights reserved.
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--
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--
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-- Redistribution and use in source and binary forms, with or without
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-- Redistribution and use in source and binary forms, with or without
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-- modification, are permitted provided that the following conditions are met:
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-- modification, are permitted provided that the following conditions are met:
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--
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--
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-- * Redistributions of source code must retain the above copyright notice,
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-- * Redistributions of source code must retain the above copyright notice,
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-- this list of conditions and the following disclaimer.
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-- this list of conditions and the following disclaimer.
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-- * Redistributions in binary form must reproduce the above copyright notice,
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-- * Redistributions in binary form must reproduce the above copyright notice,
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-- this list of conditions and the following disclaimer in the documentation
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-- this list of conditions and the following disclaimer in the documentation
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-- and/or other materials provided with the distribution.
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-- and/or other materials provided with the distribution.
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-- * Neither the name of the author nor the names of his contributors may be
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-- * Neither the name of the author nor the names of his contributors may be
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-- used to endorse or promote products derived from this software without
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-- used to endorse or promote products derived from this software without
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-- specific prior written permission.
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-- specific prior written permission.
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--
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--
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-- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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-- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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-- AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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-- AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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-- IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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-- IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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-- ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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-- ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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-- LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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-- LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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-- CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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-- CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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-- SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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-- SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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-- INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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-- INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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-- CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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-- CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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-- ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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-- ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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-- POSSIBILITY OF SUCH DAMAGE.
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-- POSSIBILITY OF SUCH DAMAGE.
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--
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--
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--------------------------------------------------------------------------------
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--------------------------------------------------------------------------------
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-- filename: picoblaze_wb_gpio_tb.vhd
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-- filename: picoblaze_wb_gpio_tb.vhd
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-- description: testbench for picoblaze_wb_gpio example
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-- description: testbench for picoblaze_wb_gpio example
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-- todo4user: modify stimulus as needed
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-- todo4user: modify stimulus as needed
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-- version: 0.0.0
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-- version: 0.0.0
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-- changelog: - 0.0.0, initial release
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-- changelog: - 0.0.0, initial release
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-- - ...
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-- - ...
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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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entity picoblaze_wb_gpio_tb is
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entity picoblaze_wb_gpio_tb is
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end picoblaze_wb_gpio_tb;
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end picoblaze_wb_gpio_tb;
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architecture behavioral of picoblaze_wb_gpio_tb is
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architecture behavioral of picoblaze_wb_gpio_tb is
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component picoblaze_wb_gpio is
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component picoblaze_wb_gpio is
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port
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port
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(
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(
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p_rst_i : in std_logic;
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p_rst_n_i : in std_logic;
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p_clk_i : in std_logic;
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p_clk_i : in std_logic;
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p_gpio_io : inout std_logic_vector(7 downto 0)
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p_gpio_io : inout std_logic_vector(7 downto 0)
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);
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);
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end component;
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end component;
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signal rst : std_logic := '1';
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signal rst_n : std_logic := '0';
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signal clk : std_logic := '1';
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signal clk : std_logic := '1';
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signal gpio : std_logic_vector(7 downto 0) := (others => 'Z');
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signal gpio : std_logic_vector(7 downto 0) := (others => 'Z');
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constant PERIOD : time := 20 ns;
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constant PERIOD : time := 20 ns;
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signal test_data_in : std_logic_vector(7 downto 4) := (others => '0');
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signal test_data_in : std_logic_vector(7 downto 4) := (others => '0');
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begin
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begin
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rst <= '0' after PERIOD*2;
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-- system signal generation
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rst_n <= '1' after PERIOD*2;
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clk <= not clk after PERIOD/2;
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clk <= not clk after PERIOD/2;
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process
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-- 4 bit counting data, changing after some micro seconds
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begin
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test_data_in <= std_logic_vector(unsigned(test_data_in) + 1) after 3000 ns;
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wait for 2500 ns;
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-- stimulus at upper gpio nibble
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test_data_in <= std_logic_vector(unsigned(test_data_in) + 1);
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end process;
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gpio(7 downto 4) <= test_data_in;
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gpio(7 downto 4) <= test_data_in;
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-- design under test instance
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dut : picoblaze_wb_gpio
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dut : picoblaze_wb_gpio
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port map
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port map
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(
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(
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p_rst_i => rst,
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p_rst_n_i => rst_n,
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p_clk_i => clk,
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p_clk_i => clk,
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p_gpio_io => gpio
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p_gpio_io => gpio
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);
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);
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end behavioral;
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end behavioral;
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