////////////////////////////////////////////////////////////////////////////////
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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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// used to endorse or promote products derived from this software without
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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.v
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// filename: picoblaze_wb_gpio_tb.v
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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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`uselib lib = unisims_ver
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`uselib lib = unisims_ver
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`timescale 1 ns / 1 ps
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`timescale 1 ns / 1 ps
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module picoblaze_wb_gpio_tb;
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module picoblaze_wb_gpio_tb;
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reg rst_n;
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reg rst_n;
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reg clk;
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reg clk;
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wire[7:0] gpio;
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wire[7:0] gpio;
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parameter PERIOD = 20;
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parameter PERIOD = 20;
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reg[7:4] test_data_in;
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reg[7:4] test_data_in;
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// system signal generation
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// system signal generation
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initial begin
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initial begin
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test_data_in = 4'h0;
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test_data_in = 4'h0;
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clk = 1'b1;
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clk = 1'b1;
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rst_n = 1'b0;
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rst_n = 1'b0;
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#(PERIOD*2) rst_n = 1'b1;
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#(PERIOD*2) rst_n = 1'b1;
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end
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end
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always #(PERIOD/2) clk = ! clk;
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always #(PERIOD/2) clk = ! clk;
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// 4 bit counting data, changing after some micro seconds
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// 4 bit counting data, changing after some micro seconds
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always #3000 test_data_in = test_data_in + 1;
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always #3000 test_data_in = test_data_in + 1;
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// stimulus at upper gpio nibble
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// stimulus at upper gpio nibble
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assign gpio[7:4] = test_data_in;
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assign gpio[7:4] = test_data_in;
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// design under test instance
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// design under test instance
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picoblaze_wb_gpio dut (
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picoblaze_wb_gpio dut (
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.p_rst_n_i(rst_n),
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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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endmodule
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endmodule
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