Subversion Repositories xucpu

-- Copyright 2015, Jürgen Defurne
--
-- This file is part of the Experimental Unstable CPU System.
--
-- The Experimental Unstable CPU System Is free software: you can redistribute
-- it and/or modify it under the terms of the GNU Lesser General Public License
-- as published by the Free Software Foundation, either version 3 of the
-- License, or (at your option) any later version.
--
-- The Experimental Unstable CPU System is distributed in the hope that it will
-- be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser
-- General Public License for more details.
--
-- You should have received a copy of the GNU Lesser General Public License
-- along with Experimental Unstable CPU System. If not, see
-- http://www.gnu.org/licenses/lgpl.txt.
 
 
LIBRARY ieee;
USE ieee.std_logic_1164.ALL;
 
-- Uncomment the following library declaration if using
-- arithmetic functions with Signed or Unsigned values
--USE ieee.numeric_std.ALL;
 
ENTITY system_sim IS
END system_sim;
 
ARCHITECTURE behavior OF system_sim IS
 
  -- Component Declaration for the Unit Under Test (UUT)
 
  COMPONENT system
    PORT(
      clock     : IN  STD_LOGIC;
      reset     : IN  STD_LOGIC;
      led_out   : OUT STD_LOGIC_VECTOR(7 DOWNTO 0);
      switch_in : IN  STD_LOGIC_VECTOR(7 DOWNTO 0);
      pushb_in  : IN  STD_LOGIC_VECTOR(4 DOWNTO 0)
      );
  END COMPONENT;
 
 
  --Inputs
  SIGNAL clock     : STD_LOGIC                    := '0';
  SIGNAL reset     : STD_LOGIC                    := '0';
  SIGNAL switch_in : STD_LOGIC_VECTOR(7 DOWNTO 0) := (OTHERS => '0');
  SIGNAL pushb_in  : STD_LOGIC_VECTOR(4 DOWNTO 0) := (OTHERS => '0');
 
  --Outputs
  SIGNAL led_out : STD_LOGIC_VECTOR(7 DOWNTO 0);
 
  -- Clock period definitions
  -- Main clock on the board is 100 MHz
  CONSTANT clock_period : TIME := 10 ns;
 
BEGIN
 
  -- Instantiate the Unit Under Test (UUT)
  uut : system PORT MAP (
    clock     => clock,
    reset     => reset,
    led_out   => led_out,
    switch_in => switch_in,
    pushb_in  => pushb_in
    );
 
  -- Clock process definitions
  clock_process : PROCESS
  BEGIN
    clock <= '0';
    WAIT FOR clock_period/2;
    clock <= '1';
    WAIT FOR clock_period/2;
  END PROCESS;
 
 
  -- Stimulus process
  stim_proc : PROCESS
  BEGIN
    -- hold reset state for 100 ns.
    WAIT FOR 50 ns;
    reset <= '1';
 
    WAIT FOR clock_period*5;
    reset <= '0';
 
    -- insert stimulus here 
 
    WAIT;
  END PROCESS;
 
END;