Subversion Repositories funbase_ip_library

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

-- Title      : Led blinker for ase_mesh1

-- Project    : 

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

-- File       : led_pkt_codec_mk2.vhd

-- Author     : Lasse Lehtonen

-- Company    : 

-- Created    : 2011-11-09

-- Last update: 2011-12-02

-- Platform   : 

-- Standard   : VHDL'87

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

-- Description: Inverts led output for evey data word received.

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

-- Copyright (c) 2011 

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

-- Revisions  :

-- Date        Version  Author  Description

-- 2011-11-09  1.0      lehton87        Created

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

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

-- Funbase IP library Copyright (C) 2011 TUT Department of Computer Systems

--

-- This source file may be used and distributed without

-- restriction provided that this copyright statement is not

-- removed from the file and that any derivative work contains

-- the original copyright notice and the associated disclaimer.

--

-- This source file 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 2.1 of the License, or (at your option) any

-- later version.

--

-- This source 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 this source; if not, download it

-- from http://www.opencores.org/lgpl.shtml

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

library ieee;

use ieee.std_logic_1164.all;

entity led_pkt_codec_mk2 is

  port (

    clk       : in  std_logic;

    rst_n     : in  std_logic;

    cmd_in    : in  std_logic_vector(1 downto 0);

    data_in   : in  std_logic_vector(31 downto 0);

    stall_out : out std_logic;

    cmd_out   : out std_logic_vector(1 downto 0);

    data_out  : out std_logic_vector(31 downto 0);

    stall_in  : in  std_logic;

    led_out   : out std_logic

    );

end led_pkt_codec_mk2;

architecture rtl of led_pkt_codec_mk2 is

  signal led_r : std_logic;

begin  -- rtl

  data_out  <= (others => '0');

  cmd_out   <= (others => '0');

  stall_out <= '0';                     -- This accepts all incoming data

  led_out   <= led_r;

  --

  -- Read input

  --   

  main_p : process (clk, rst_n)

  begin  -- process main_p

    if rst_n = '0' then                 -- asynchronous reset (active low)

      led_r <= '1';

    elsif clk'event and clk = '1' then  -- rising clock edge

      if cmd_in = "00" then

        -- no data coming in

      elsif cmd_in = "01" then

        -- address coming in, don't care what it is

      elsif cmd_in = "10" then

        -- data coming in, donät care about its value

        led_r <= not led_r;

      else

        -- not defined

      end if;

    end if;

  end process main_p;

end rtl;