Project

General

Profile

Download (1.67 KB) Statistics
| Branch: | Tag: | Revision:
1

    
2
-- Copyright (C) 1996 Morgan Kaufmann Publishers, Inc
3

    
4
-- This file is part of VESTs (Vhdl tESTs).
5

    
6
-- VESTs is free software; you can redistribute it and/or modify it
7
-- under the terms of the GNU General Public License as published by the
8
-- Free Software Foundation; either version 2 of the License, or (at
9
-- your option) any later version. 
10

    
11
-- VESTs is distributed in the hope that it will be useful, but WITHOUT
12
-- ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13
-- FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14
-- for more details. 
15

    
16
-- You should have received a copy of the GNU General Public License
17
-- along with VESTs; if not, write to the Free Software Foundation,
18
-- Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA 
19

    
20
-- ---------------------------------------------------------------------
21
--
22
-- $Id: ch_08_fg_08_01.vhd,v 1.1.1.1 2001-08-22 18:20:48 paw Exp $
23
-- $Revision: 1.1.1.1 $
24
--
25
-- ---------------------------------------------------------------------
26

    
27
-- code from book
28

    
29
package cpu_types is
30

    
31
  constant word_size : positive := 16;
32
  constant address_size : positive := 24;
33

    
34
  subtype word is bit_vector(word_size - 1 downto 0);
35
  subtype address is bit_vector(address_size - 1 downto 0);
36

    
37
  type status_value is ( halted, idle, fetch, mem_read, mem_write,
38
                         io_read, io_write, int_ack );
39

    
40
end package cpu_types;
41

    
42
-- end code from book
43

    
44

    
45

    
46
package fg_08_01 is
47

    
48
  constant status :
49
    -- code from book
50
    work.cpu_types.status_value
51
    -- end code from book
52
    :=
53
    -- code from book
54
    work.cpu_types.status_value'(work.cpu_types.fetch)
55
    -- end code from book
56
    ;
57

    
58
end package fg_08_01;
(47-47/171)