-- Copyright (C) 1996 Morgan Kaufmann Publishers, Inc

-- This file is part of VESTs (Vhdl tESTs).

-- VESTs is free software; you can redistribute it and/or modify it
-- under the terms of the GNU General Public License as published by the
-- Free Software Foundation; either version 2 of the License, or (at
-- your option) any later version. 

-- VESTs 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 more details. 

-- You should have received a copy of the GNU General Public License
-- along with VESTs; if not, write to the Free Software Foundation,
-- Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA 

-- ---------------------------------------------------------------------
--
-- $Id: ch_21_fg_21_04.vhd,v 1.2 2001-10-26 16:29:37 paw Exp $
-- $Revision: 1.2 $
--
-- ---------------------------------------------------------------------

library ieee;  use ieee.std_logic_1164.all;

               entity processor is
               end entity processor;


-- code from book

               architecture rtl of processor is

                 component latch is
                                   generic ( width : positive );
                                 port ( d : in std_ulogic_vector(0 to width - 1);
                                        q : out std_ulogic_vector(0 to width - 1);
                                        -- . . . );
                                        -- not in book
                                        other_port : in std_ulogic := '-' );
                                 -- end not in book
                 end component latch;

                 component ROM is
                                 port ( d_out : out std_ulogic_vector;  -- . . . );
                                        -- not in book
                                        other_port : in std_ulogic := '-' );
                               -- end not in book
                 end component ROM;

                 subtype std_logic_word is std_logic_vector(0 to 31);

                 signal source1, source2, destination : std_logic_word;
                 -- . . .

               begin

                 temp_register : component latch
                   generic map ( width => 32 )
                   port map ( d => std_ulogic_vector(destination),
                              std_logic_vector(q) => source1, -- . . . );
                              -- not in book
                              other_port => open );
                 -- end not in book

                 constant_ROM : component ROM
                   port map ( std_logic_word(d_out) => source2, -- . . . );
                              -- not in book
                              other_port => open );
                 -- end not in book

                 -- . . .

               end architecture rtl;

-- end code from book