[SOLVED] infering latches in case statement??

[me0414013]

i have no idea why i am getting latch infer warnings in this code below
and i made sure that all cases covered including default case.


library ieee;
library work;
use ieee.std_logic_1164.all;
use ieee.std_logic_misc.all;
use ieee.numeric_std.all;
entity freqdomaintrainingseqmem is
port (
state : in std_logic;
seq_addr : in unsigned( 5 downto 0 );
sign : out signed( 1 downto 0 )
);
end entity;


architecture rtl of freqdomaintrainingseqmem is
begin

process(state,seq_addr)
begin

case ( state ) is
when
'0' =>
case (to_integer( seq_addr)) is
when
0 =>

sign <= to_signed(0,2) ;

when
1 =>
sign <= to_signed(0,2) ;
when
2 =>
sign <= to_signed(0,2) ;
when
3 =>
sign <= to_signed(0,2) ;
when
4 =>
sign <= to_signed(0,2) ;
when
5 =>
sign <= to_signed(0,2) ;
when
6 =>
sign <= to_signed(0,2) ;
when
7 =>
sign <= to_signed(0,2) ;
when
8 =>
sign <= to_signed(1,2) ;
when
9 =>
sign <= to_signed(0,2) ;
when
10 =>
sign <= to_signed(0,2) ;
when
11 =>
sign <= to_signed(0,2) ;
when
12 =>
sign <= ( to_signed(-1,2) ) ;
when
13 =>
sign <= to_signed(0,2) ;
when
14 =>
sign <= to_signed(0,2) ;
when
15 =>
sign <= to_signed(0,2) ;
when
16 =>
sign <= to_signed(1,2) ;
when
17 =>
sign <= to_signed(0,2) ;
when
18 =>
sign <= to_signed(0,2) ;
when
19 =>
sign <= to_signed(0,2) ;
when
20 =>
sign <= ( to_signed(-1,2) ) ;
when
21 =>
sign <= to_signed(0,2) ;
when
22 =>
sign <= to_signed(0,2) ;
when
23 =>
sign <= to_signed(0,2) ;
when
24 =>
sign <= ( to_signed(-1,2) ) ;
when
25 =>
sign <= to_signed(0,2) ;
when
26 =>
sign <= to_signed(0,2) ;
when
27 =>
sign <= to_signed(0,2) ;
when
28 =>
sign <= to_signed(1,2) ;
when
29 =>
sign <= to_signed(0,2) ;
when
30 =>
sign <= to_signed(0,2) ;
when
31 =>
sign <= to_signed(0,2) ;
when
32 =>
sign <= to_signed(0,2) ;
when
33 =>
sign <= to_signed(0,2) ;
when
34 =>
sign <= to_signed(0,2) ;
when
35 =>
sign <= to_signed(0,2) ;
when
36 =>
sign <= ( to_signed(-1,2) ) ;
when
37 =>
sign <= to_signed(0,2) ;
when
38 =>
sign <= to_signed(0,2) ;
when
39 =>
sign <= to_signed(0,2) ;
when
40 =>
sign <= ( to_signed(-1,2) ) ;
when
41 =>
sign <= to_signed(0,2) ;
when
42 =>
sign <= to_signed(0,2) ;
when
43 =>
sign <= to_signed(0,2) ;
when
44 =>
sign <= to_signed(1,2) ;
when
45 =>
sign <= to_signed(0,2) ;
when
46 =>
sign <= to_signed(0,2) ;
when
47 =>
sign <= to_signed(0,2) ;
when
48 =>
sign <= to_signed(1,2) ;
when
49 =>
sign <= to_signed(0,2) ;
when
50 =>
sign <= to_signed(0,2) ;
when
51 =>
sign <= to_signed(0,2) ;
when
52 =>
sign <= to_signed(1,2) ;
when
53 =>
sign <= to_signed(0,2) ;
when
54 =>
sign <= to_signed(0,2) ;
when
55 =>
sign <= to_signed(0,2) ;
when
56 =>
sign <= to_signed(1,2) ;
when
57 =>
sign <= to_signed(0,2) ;
when
58 =>
sign <= to_signed(0,2) ;
when
59 =>
sign <= to_signed(0,2) ;
when
60 =>
sign <= to_signed(0,2) ;
when
61 =>
sign <= to_signed(0,2) ;
when
62 =>
sign <= to_signed(0,2) ;
when
63 =>
sign <= to_signed(0,2) ;
when others=>null;
end case;

when
'1' =>
case (to_integer( seq_addr) ) is
when
0 =>
sign <= to_signed(0,2) ;
when
1 =>
sign <= to_signed(0,2) ;
when
2 =>
sign <= to_signed(0,2) ;
when
3 =>
sign <= to_signed(0,2) ;
when
4 =>
sign <= to_signed(0,2) ;
when
5 =>
sign <= to_signed(0,2) ;
when
6 =>
sign <= to_signed(1,2) ;
when
7 =>
sign <= to_signed(1,2) ;
when
8 =>
sign <= ( to_signed(-1,2) ) ;
when
9 =>
sign <= ( to_signed(-1,2) ) ;
when
10 =>
sign <= to_signed(1,2) ;
when
11 =>
sign <= to_signed(1,2) ;
when
12 =>
sign <= ( to_signed(-1,2) ) ;
when
13 =>
sign <= to_signed(1,2) ;
when
14 =>
sign <= ( to_signed(-1,2) ) ;
when
15 =>
sign <= to_signed(1,2) ;
when
16 =>
sign <= to_signed(1,2) ;
when
17 =>
sign <= to_signed(1,2) ;
when
18 =>
sign <= to_signed(1,2) ;
when
19 =>
sign <= to_signed(1,2) ;
when
20 =>
sign <= to_signed(1,2) ;
when
21 =>
sign <= ( to_signed(-1,2) ) ;
when
22 =>
sign <= ( to_signed(-1,2) ) ;
when
23 =>
sign <= to_signed(1,2) ;
when
24 =>
sign <= to_signed(1,2) ;
when
25 =>
sign <= ( to_signed(-1,2) ) ;
when
26 =>
sign <= to_signed(1,2) ;
when
27 =>
sign <= ( to_signed(-1,2) ) ;
when
28 =>
sign <= to_signed(1,2) ;
when
29 =>
sign <= to_signed(1,2) ;
when
30 =>
sign <= to_signed(1,2) ;
when
31 =>
sign <= to_signed(1,2) ;
when
32 =>
sign <= to_signed(0,2) ;
when
33 =>
sign <= to_signed(1,2) ;
when
34 =>
sign <= ( to_signed(-1,2) ) ;
when
35 =>
sign <= ( to_signed(-1,2) ) ;
when
36 =>
sign <= to_signed(1,2) ;
when
37 =>
sign <= to_signed(1,2) ;
when
38 =>
sign <= ( to_signed(-1,2) ) ;
when
39 =>
sign <= to_signed(1,2) ;
when
40 =>
sign <= ( to_signed(-1,2) ) ;
when
41 =>
sign <= to_signed(1,2) ;
when
42 =>
sign <= ( to_signed(-1,2) ) ;
when
43 =>
sign <= ( to_signed(-1,2) ) ;
when
44 =>
sign <= ( to_signed(-1,2) ) ;
when
45 =>
sign <= ( to_signed(-1,2) ) ;
when
46 =>
sign <= ( to_signed(-1,2) ) ;
when
47 =>
sign <= to_signed(1,2) ;
when
48 =>
sign <= to_signed(1,2) ;
when
49 =>
sign <= ( to_signed(-1,2) ) ;
when
50 =>
sign <= ( to_signed(-1,2) ) ;
when
51 =>
sign <= to_signed(1,2) ;
when
52 =>
sign <= ( to_signed(-1,2) ) ;
when
53 =>
sign <= to_signed(1,2) ;
when
54 =>
sign <= ( to_signed(-1,2) ) ;
when
55 =>
sign <= to_signed(1,2) ;
when
56 =>
sign <= to_signed(1,2) ;
when
57 =>
sign <= to_signed(1,2) ;
when
58 =>
sign <= to_signed(1,2) ;
when
59 =>
sign <= to_signed(0,2) ;
when
60 =>
sign <= to_signed(0,2) ;
when
61 =>
sign <= to_signed(0,2) ;
when
62 =>
sign <= to_signed(0,2) ;
when
63 =>
sign <= to_signed(0,2) ;
when others=>null;
end case;
when others=>null;
end case;
end process;
end;

 

[aruipksni]

check this :

when others=>null;

 

[me0414013]

check this :

when others=>null;

i did that too where ever it is needed

 

[aruipksni]

i did that too where ever it is needed

try give "sign" default assignment.

 

[FvM]

Looks like yo're paid per line. Pretty much of text to write a simple translation table that can be written as a simple constant array.

A simple way to avoid unintentional latch inference is to place an unconditional default assignment before the conditional code.

sign <= to_signed(0,2) ;
case ( state ) is 
....

 

[me0414013]

thanks "fvm"