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----------------------------------------------------------------------
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---- ----
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---- PlTbUtils Components ----
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---- ----
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---- This file is part of the PlTbUtils project ----
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---- http://opencores.org/project,pltbutils ----
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---- ----
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---- Description: ----
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---- PlTbUtils is a collection of functions, procedures and ----
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---- components for easily creating stimuli and checking response ----
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---- in automatic self-checking testbenches. ----
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---- ----
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---- pltbutils_comp.vhd (this file) defines testbench components. ----
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---- ----
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---- ----
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---- To Do: ----
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---- - ----
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---- ----
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---- Author(s): ----
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---- - Per Larsson, pela.opencores@gmail.com ----
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---- ----
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----------------------------------------------------------------------
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---- ----
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---- Copyright (C) 2013 Authors and OPENCORES.ORG ----
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---- ----
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---- This source file may be used and distributed without ----
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---- restriction provided that this copyright statement is not ----
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---- removed from the file and that any derivative work contains ----
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---- the original copyright notice and the associated disclaimer. ----
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---- ----
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---- This source file is free software; you can redistribute it ----
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---- and/or modify it under the terms of the GNU Lesser General ----
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---- Public License as published by the Free Software Foundation; ----
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---- either version 2.1 of the License, or (at your option) any ----
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---- later version. ----
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---- ----
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---- This source is distributed in the hope that it will be ----
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---- useful, but WITHOUT ANY WARRANTY; without even the implied ----
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---- warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR ----
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---- PURPOSE. See the GNU Lesser General Public License for more ----
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---- details. ----
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---- ----
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---- You should have received a copy of the GNU Lesser General ----
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---- Public License along with this source; if not, download it ----
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---- from http://www.opencores.org/lgpl.shtml ----
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---- ----
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----------------------------------------------------------------------
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----------------------------------------------------------------------
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-- pltbutils_clkgen
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-- Creates a clock for use in a testbech.
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-- A non-inverted as well as an inverted output is available,
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-- use one or both depending on if you need a single-ended or
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-- differential clock.
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-- The clock stops when input port stop_sim goes '1'.
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-- This makes the simulator stop (unless there are other infinite
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-- processes running in the simulation).
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----------------------------------------------------------------------
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library ieee;
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use ieee.std_logic_1164.all;
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entity pltbutils_clkgen is
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generic (
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G_PERIOD : time := 10 ns;
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G_INITVALUE : std_logic := '0'
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);
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port (
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clk_o : out std_logic;
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clk_n_o : out std_logic;
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stop_sim_i : in std_logic
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);
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end entity pltbutils_clkgen;
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architecture bhv of pltbutils_clkgen is
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constant C_HALF_PERIOD : time := G_PERIOD / 2;
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signal clk : std_logic := G_INITVALUE;
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begin
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clk <= not clk and not stop_sim_i after C_HALF_PERIOD;
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clk_o <= clk;
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clk_n_o <= not clk;
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end architecture bhv;
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