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
|
-- 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:
package coeff_ram_types is
subtype coeff_ram_address is integer range 0 to 63;
end package coeff_ram_types;
use work.coeff_ram_types.all;
-- end not in book
entity coeff_ram is
port ( rd, wr : in bit; addr : in coeff_ram_address;
d_in : in real; d_out : out real );
end entity coeff_ram;
--------------------------------------------------
architecture abstract of coeff_ram is
begin
memory : process is
type coeff_array is array (coeff_ram_address) of real;
variable coeff : coeff_array;
begin
for index in coeff_ram_address loop
coeff(index) := 0.0;
end loop;
loop
wait on rd, wr, addr, d_in;
if rd = '1' then
d_out <= coeff(addr);
end if;
if wr = '1' then
coeff(addr) := d_in;
end if;
end loop;
end process memory;
end architecture abstract;
|
