Exemplos
Seleção de dispositivos (periféricos) segundo um mapa de endereços definido.

Entrada e saída tipo Bit_Vector
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
 capa_1ra-- exemplo de selecao de dispositivos
-- mapa:   endereco(15 14 13 12)  dispositivo(7 6 5 4 3 2 1 0)
--                   0  0  0  0               0 0 0 0 0 0 0 1   0000 a 0FFF
--                   0  0  0  1               0 0 0 0 0 0 1 0   1000 a 1FFF
--                   0  0  1  0               0 0 0 0 0 1 0 0   2000 a 2FFF
--                   0  0  1  1               0 0 0 0 1 0 0 0   3000 a 3FFF
--                   0  1  -  -               0 0 0 1 0 0 0 0   4000 a 7FFF
--                   1  0  0  -               0 0 1 0 0 0 0 0   8000 a 9FFF 
--                   1  0  1  -               0 1 0 0 0 0 0 0   A000 a BFFF
--                   1  1  -  -               1 0 0 0 0 0 0 0   C000 a FFFF   

ENTITY endereco_a IS
  PORT (endereco         : IN  BIT_VECTOR(15 DOWNTO 0);
        dispositivo_sel  : OUT BIT_VECTOR(7 DOWNTO 0));
END endereco_a;

ARCHITECTURE teste OF endereco_a IS
 
BEGIN
   dispositivo_sel <= "10000000" WHEN endereco(15 DOWNTO 14) = "11"   ELSE
                      "01000000" WHEN endereco(15 DOWNTO 13) = "101"  ELSE
                      "00100000" WHEN endereco(15 DOWNTO 13) = "100"  ELSE
                      "00010000" WHEN endereco(15 DOWNTO 14) = "01"   ELSE
                      "00001000" WHEN endereco(15 DOWNTO 12) = "0011" ELSE
                      "00000100" WHEN endereco(15 DOWNTO 12) = "0010" ELSE
                      "00000010" WHEN endereco(15 DOWNTO 12) = "0001" ELSE
                      "00000001";                           -- "0000"
END teste;

--  Resultado da sintese:
-- ***********************************************
-- Device Utilization for EPF10K70RC240
-- ***********************************************
-- Resource                Used    Avail   Utilization
-- -----------------------------------------------
-- IOs                     24      189      12.70%
-- LCs                     8       3744      0.21%
-- DFFs                    0       4096      0.00%
-- Memory Bits             0       18432     0.00%
-- CARRYs                  0       3744      0.00%
-- CASCADEs                0       3744      0.00%

Entrada  tipo Integer  e saída tipo  Bit_Vector
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
 capa_1ra-- exemplo de selecao de dispositivos
-- mapa:   endereco(15 14 13 12)  dispositivo(7 6 5 4 3 2 1 0)
--                   0  0  0  0               0 0 0 0 0 0 0 1   0000 a 0FFF
--                   0  0  0  1               0 0 0 0 0 0 1 0   1000 a 1FFF
--                   0  0  1  0               0 0 0 0 0 1 0 0   2000 a 2FFF
--                   0  0  1  1               0 0 0 0 1 0 0 0   3000 a 3FFF
--                   0  1  -  -               0 0 0 1 0 0 0 0   4000 a 7FFF
--                   1  0  0  -               0 0 1 0 0 0 0 0   8000 a 9FFF 
--                   1  0  1  -               0 1 0 0 0 0 0 0   A000 a BFFF
--                   1  1  -  -               1 0 0 0 0 0 0 0   C000 a FFFF   

ENTITY endereco_b IS
  PORT (endereco         : IN  INTEGER RANGE 0 TO (2**16)-1;
        dispositivo_sel  : OUT BIT_VECTOR(7 DOWNTO 0));
END endereco_b;

ARCHITECTURE teste OF endereco_b IS
 
BEGIN
   WITH endereco SELECT
     dispositivo_sel <= "10000000" WHEN 16#C000# TO 16#FFFF#,
                        "01000000" WHEN 16#A000# TO 16#BFFF#,
                        "00100000" WHEN 16#8000# TO 16#9FFF#,
                        "00010000" WHEN 16#4000# TO 16#7FFF#,
                        "00001000" WHEN 16#3000# TO 16#3FFF#,
                        "00000100" WHEN 16#2000# TO 16#2FFF#,
                        "00000010" WHEN 16#1000# TO 16#1FFF#,
                        "00000001" WHEN 16#0000# TO 16#0FFF#; 
END teste;

--  Resultado da sintese:
-- ***********************************************
-- Device Utilization for EPF10K70RC240
-- ***********************************************
-- Resource                Used    Avail   Utilization
-- -----------------------------------------------
-- IOs                     24      189      12.70%
-- LCs                     8       3744      0.21%
-- DFFs                    0       4096      0.00%
-- Memory Bits             0       18432     0.00%
-- CARRYs                  0       3744      0.00%
-- CASCADEs                0       3744      0.00%

Entrada  tipo Unsigned e saída tipo Bit_Vector
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
 capa_1ra-- exemplo de selecao de dispositivos
-- mapa:   endereco(15 14 13 12)  dispositivo(7 6 5 4 3 2 1 0)
--                   0  0  0  0               0 0 0 0 0 0 0 1   0000 a 0FFF
--                   0  0  0  1               0 0 0 0 0 0 1 0   1000 a 1FFF
--                   0  0  1  0               0 0 0 0 0 1 0 0   2000 a 2FFF
--                   0  0  1  1               0 0 0 0 1 0 0 0   3000 a 3FFF
--                   0  1  -  -               0 0 0 1 0 0 0 0   4000 a 7FFF
--                   1  0  0  -               0 0 1 0 0 0 0 0   8000 a 9FFF 
--                   1  0  1  -               0 1 0 0 0 0 0 0   A000 a BFFF
--                   1  1  -  -               1 0 0 0 0 0 0 0   C000 a FFFF   

LIBRARY ieee;
USE ieee.std_logic_1164.ALL;
USE ieee.numeric_bit.ALL;

ENTITY endereco_c IS
  PORT (endereco         : IN  UNSIGNED(15 DOWNTO 0);
        dispositivo_sel  : OUT BIT_VECTOR(7 DOWNTO 0));
END endereco_c;

ARCHITECTURE teste OF endereco_c IS
     SIGNAL endereco_inteiro : INTEGER RANGE 0 TO (2**16)-1;

BEGIN
  -- converte tipo signed para tipo inteiro
  endereco_inteiro <= to_integer(endereco);

  WITH endereco_inteiro SELECT
    dispositivo_sel <= "10000000" WHEN 16#C000# TO 16#FFFF#,
                       "01000000" WHEN 16#A000# TO 16#BFFF#,
                       "00100000" WHEN 16#8000# TO 16#9FFF#,
                       "00010000" WHEN 16#4000# TO 16#7FFF#,
                       "00001000" WHEN 16#3000# TO 16#3FFF#,
                       "00000100" WHEN 16#2000# TO 16#2FFF#,
                       "00000010" WHEN 16#1000# TO 16#1FFF#,
                       "00000001" WHEN 16#0000# TO 16#0FFF#; 
END teste;

--  Resultado da sintese:
-- ***********************************************
-- Device Utilization for EPF10K70RC240
-- ***********************************************
-- Resource                Used    Avail   Utilization
-- -----------------------------------------------
-- IOs                     24      189      12.70%
-- LCs                     8       3744      0.21%
-- DFFs                    0       4096      0.00%
-- Memory Bits             0       18432     0.00%
-- CARRYs                  0       3744      0.00%
-- CASCADEs                0       3744      0.00%

Entrada e saída  tipo Std_Logic_Vector
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
 capa_1ra-- exemplo de selecao de dispositivos
-- mapa:   endereco(15 14 13 12)  dispositivo(7 6 5 4 3 2 1 0)
--                   0  0  0  0               0 0 0 0 0 0 0 1   0000 a 0FFF
--                   0  0  0  1               0 0 0 0 0 0 1 0   1000 a 1FFF
--                   0  0  1  0               0 0 0 0 0 1 0 0   2000 a 2FFF
--                   0  0  1  1               0 0 0 0 1 0 0 0   3000 a 3FFF
--                   0  1  -  -               0 0 0 1 0 0 0 0   4000 a 7FFF
--                   1  0  0  -               0 0 1 0 0 0 0 0   8000 a 9FFF 
--                   1  0  1  -               0 1 0 0 0 0 0 0   A000 a BFFF
--                   1  1  -  -               1 0 0 0 0 0 0 0   C000 a FFFF   

LIBRARY ieee;
USE ieee.std_logic_1164.ALL;
USE ieee.numeric_std.ALL;

ENTITY endereco_d IS
  PORT (endereco         : IN  STD_LOGIC_VECTOR(15 DOWNTO 0);
        dispositivo_sel  : OUT STD_LOGIC_VECTOR(7 DOWNTO 0));
END endereco_d;

ARCHITECTURE teste OF endereco_d IS
  SIGNAL endereco_inteiro  : INTEGER RANGE 0 TO (2**16)-1;
  SIGNAL endereco_numerico : UNSIGNED(15 DOWNTO 0);
BEGIN
  -- converte o vetor tipo std_logic para tipo unsigned
  converte_para_numerico: FOR i IN 0 TO 15 GENERATE
    endereco_numerico(i) <= endereco(i);
  END GENERATE;

  -- converte tipo unsigned para tipo inteiro
  endereco_inteiro <= to_integer(endereco_numerico);

  WITH endereco_inteiro SELECT
    dispositivo_sel <= "10000000" WHEN 16#C000# TO 16#FFFF#,
                       "01000000" WHEN 16#A000# TO 16#BFFF#,
                       "00100000" WHEN 16#8000# TO 16#9FFF#,
                       "00010000" WHEN 16#4000# TO 16#7FFF#,
                       "00001000" WHEN 16#3000# TO 16#3FFF#,
                       "00000100" WHEN 16#2000# TO 16#2FFF#,
                       "00000010" WHEN 16#1000# TO 16#1FFF#,
                       "00000001" WHEN 16#0000# TO 16#0FFF#; 
END teste;

--  Resultado da sintese:
-- ***********************************************
-- Device Utilization for EPF10K70RC240
-- ***********************************************
-- Resource                Used    Avail   Utilization
-- -----------------------------------------------
-- IOs                     24      189      12.70%
-- LCs                     8       3744      0.21%
-- DFFs                    0       4096      0.00%
-- Memory Bits             0       18432     0.00%
-- CARRYs                  0       3744      0.00%
-- CASCADEs                0       3744      0.00%