1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
|
-- Copyright (C) 2002 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
-- not in book
entity single_board_computer is
end entity single_board_computer;
-- end not in book
architecture structural of single_board_computer is
-- . . . -- type and signal declarations
-- not in book
subtype word is bit_vector(31 downto 0);
signal sys_clk : bit;
signal cpu_a_d, latched_addr : word;
-- end not in book
component processor is
port ( clk : in bit; a_d : inout word; -- . . . );
-- not in book
other_port : in bit := '0' );
-- end not in book
end component processor;
component memory is
port ( addr : in bit_vector(25 downto 0); -- . . . );
-- not in book
other_port : in bit := '0' );
-- end not in book
end component memory;
component serial_interface is
port ( clk : in bit; address : in bit_vector(3 downto 0); -- . . . );
-- not in book
other_port : in bit := '0' );
-- end not in book
end component serial_interface;
begin
cpu : component processor
port map ( clk => sys_clk, a_d => cpu_a_d, -- . . . );
-- not in book
other_port => open );
-- end not in book
main_memory : component memory
port map ( addr => latched_addr(25 downto 0), -- . . . );
-- not in book
other_port => open );
-- end not in book
serial_interface_a : component serial_interface
port map ( clk => sys_clk, address => latched_addr(3 downto 0), -- . . . );
-- not in book
other_port => open );
-- end not in book
-- . . .
end architecture structural;
|
