tb_arty_core.vhd

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-- $Id: tb_arty_core.vhd 1181 2019-07-08 17:00:50Z mueller $
-- SPDX-License-Identifier: GPL-3.0-or-later
-- Copyright 2016- by Walter F.J. Mueller <W.F.J.Mueller@gsi.de>
-- 
------------------------------------------------------------------------------
-- Module Name:    tb_arty_core - sim
-- Description:    Test bench for arty - core device handling
--
-- Dependencies:   -
--
-- To test:        generic, any arty target
--
-- Target Devices: generic
-- Tool versions:  viv 2015.4; ghdl 0.33
-- Revision History: 
-- Date         Rev Version  Comment
-- 2016-01-31   726   1.0    Initial version (derived from tb_basys3_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.simbus.all;
 
entity tb_arty_core is
  port (
    I_SWI : out slv4;                   -- arty switches
    I_BTN : out slv4                    -- arty buttons
  );
end tb_arty_core;
 
architecture sim of tb_arty_core is
  
  signal R_SWI    : slv4 := (others=>'0');
  signal R_BTN    : slv4 := (others=>'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));
      end if;
    end if;
  end process proc_simbus;
 
  I_SWI <= R_SWI;
  I_BTN <= R_BTN;
  
end sim;