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-- $Id: tb_nexys4_core.vhd 643 2015-02-07 17:41:53Z mueller $

--

-- Copyright 2013-2015 by Walter F.J. Mueller <W.F.J.Mueller@gsi.de>

--

-- This program is free software; you may redistribute and/or modify it under

-- the terms of the GNU General Public License as published by the Free

-- Software Foundation, either version 2, or at your option any later version.

--

-- This program 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 General Public License

-- for complete details.

-- 

------------------------------------------------------------------------------

-- Module Name:    tb_nexys4_core - sim

-- Description:    Test bench for nexys4 - core device handling

--

-- Dependencies:   -

--

-- To test:        generic, any nexys4 target

--

-- Target Devices: generic

-- Tool versions:  ise 14.5-14.7; viv 2014.4; ghdl 0.29-0.31

-- Revision History: 

-- Date         Rev Version  Comment

-- 2015-02-06   643   1.2    factor out memory

-- 2015-02-01   641   1.1    separate I_BTNRST_N

-- 2013-09-21   534   1.0    Initial version (derived from tb_nexys3_core)

------------------------------------------------------------------------------

library ieee;

use ieee.std_logic_1164.all;

use ieee.numeric_std.all;

use ieee.std_logic_textio.all;

use std.textio.all;

use work.slvtypes.all;

use work.serportlib.all;

use work.simbus.all;

entity tb_nexys4_core is

  port (

    I_SWI : out slv16;                  -- n4 switches

    I_BTN : out slv5;                   -- n4 buttons

    I_BTNRST_N : out slbit              -- n4 reset button

  );

end tb_nexys4_core;

architecture sim of tb_nexys4_core is

  signal R_SWI    : slv16 := (others=>'0');

  signal R_BTN    : slv5  := (others=>'0');

  signal R_BTNRST : slbit := '0';

  constant sbaddr_swi:  slv8 := slv(to_unsigned( 16,8));

  constant sbaddr_btn:  slv8 := slv(to_unsigned( 17,8));

begin

  proc_simbus: process (SB_VAL)

  begin

    if SB_VAL'event and to_x01(SB_VAL)='1' then

      if SB_ADDR = sbaddr_swi then

        R_SWI <= to_x01(SB_DATA(R_SWI'range));

      end if;

      if SB_ADDR = sbaddr_btn then

        R_BTN    <= to_x01(SB_DATA(R_BTN'range));

        R_BTNRST <= to_x01(SB_DATA(5));

      end if;

    end if;

  end process proc_simbus;

  I_SWI <= R_SWI;

  I_BTN <= R_BTN;

  I_BTNRST_N <= not R_BTNRST;

end sim;