我想用LUT表做一个串行fir过滤器。这是我的代码：
注册模块
library ieee;
use ieee.std_logic_1164.all;
entity reg is
port(
clk, rst : in std_logic;
d : in std_logic_vector(13 downto 0);
q : out std_logic_vector(13 downto 0)
);
end reg;
architecture arch of reg is
signal q_reg, q_next : std_logic_vector(13 downto 0);
begin
process(clk, rst)
begin
if (rst ='1') then
q_reg <= (others => '0');
elsif rising_edge(clk) then
q_reg <= q_next;
end if;
end process;
q_next <= d;
q <= q_reg;
end arch;
加法器模块：
library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
entity add is
port (
a,b : in std_logic_vector(13 downto 0);
s : out std_logic_vector(13 downto 0)
);
end add;
architecture arch of add is
signal result : signed(13 downto 0);
begin
result <= signed(a) + signed(b);
s <= std_logic_vector(result);
end arch;
Lut table：
library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_arith.all;
entity lut_table is
port(
table_in : in std_logic_vector(8 downto 0);
table_out : out std_logic_vector(13 downto 0)
);
end lut_table;
architecture arch of lut_table is
begin
with table_in select
table_out <= "00000000000000" when "000000000",
"00000001101110" when "000000001",
"11111110111011" when "000000010",
"00000000101001" when "000000011",
"00000101000000" when "000000100",
"00000110101110" when "000000101",
"00000011111011" when "000000110",
"00000101101001" when "000000111",
"00010001000101" when "000001000",
"00010010110011" when "000001001",
"00010000000000" when "000001010",
"00010001101110" when "000001011",
"00010110000101" when "000001100",
"00010111110011" when "000001101",
"00010101000000" when "000001110",
"00010110101110" when "000001111",
"00100110100110" when "000010000",
"00101000010100" when "000010001",
"00100101100001" when "000010010",
"00100111001111" when "000010011",
"00101011100110" when "000010100",
"00101101010100" when "000010101",
"00101010100001" when "000010110",
"00101100001111" when "000010111",
"00110111101011" when "000011000",
"00111001011001" when "000011001",
"00110110100110" when "000011010",
"00111000010100" when "000011011",
"00111100101011" when "000011100",
"00111110011001" when "000011101",
"00111011100110" when "000011110",
"00111101010100" when "000011111",
"00010001000101" when "000100000",
"00010010110011" when "000100001",
"00010000000000" when "000100010",
"00010001101110" when "000100011",
"00010110000101" when "000100100",
"00010111110011" when "000100101",
"00010101000000" when "000100110",
"00010110101110" when "000100111",
"00100010001010" when "000101000",
"00100011111000" when "000101001",
"00100001000101" when "000101010",
"00100010110011" when "000101011",
"00100111001010" when "000101100",
"00101000111000" when "000101101",
"00100110000101" when "000101110",
"00100111110011" when "000101111",
"00110111101011" when "000110000",
"00111001011001" when "000110001",
"00110110100110" when "000110010",
"00111000010100" when "000110011",
"00111100101011" when "000110100",
"00111110011001" when "000110101",
"00111011100110" when "000110110",
"00111101010100" when "000110111",
"01001000110000" when "000111000",
"01001010011110" when "000111001",
"01000111101011" when "000111010",
"01001001011001" when "000111011",
"01001101110000" when "000111100",
"01001111011110" when "000111101",
"01001100101011" when "000111110",
"01001110011001" when "000111111",
"00000101000000" when "001000000",
"00000110101110" when "001000001",
"00000011111011" when "001000010",
"00000101101001" when "001000011",
"00001010000000" when "001000100",
"00001011101110" when "001000101",
"00001000111011" when "001000110",
"00001010101001" when "001000111",
"00010110000101" when "001001000",
"00010111110011" when "001001001",
"00010101000000" when "001001010",
"00010110101110" when "001001011",
"00011011000101" when "001001100",
"00011100110011" when "001001101",
"00011010000000" when "001001110",
"00011011101110" when "001001111",
"00101011100110" when "001010000",
"00101101010100" when "001010001",
"00101010100001" when "001010010",
"00101100001111" when "001010011",
"00110000100110" when "001010100",
"00110010010100" when "001010101",
"00101111100001" when "001010110",
"00110001001111" when "001010111",
"00111100101011" when "001011000",
"00111110011001" when "001011001",
"00111011100110" when "001011010",
"00111101010100" when "001011011",
"01000001101011" when "001011100",
"01000011011001" when "001011101",
"01000000100110" when "001011110",
"01000010010100" when "001011111",
"00010110000101" when "001100000",
"00010111110011" when "001100001",
"00010101000000" when "001100010",
"00010110101110" when "001100011",
"00011011000101" when "001100100",
"00011100110011" when "001100101",
"00011010000000" when "001100110",
"00011011101110" when "001100111",
"00100111001010" when "001101000",
"00101000111000" when "001101001",
"00100110000101" when "001101010",
"00100111110011" when "001101011",
"00101100001010" when "001101100",
"00101101111000" when "001101101",
"00101011000101" when "001101110",
"00101100110011" when "001101111",
"00111100101011" when "001110000",
"00111110011001" when "001110001",
"00111011100110" when "001110010",
"00111101010100" when "001110011",
"01000001101011" when "001110100",
"01000011011001" when "001110101",
"01000000100110" when "001110110",
"01000010010100" when "001110111",
"01001101110000" when "001111000",
"01001111011110" when "001111001",
"01001100101011" when "001111010",
"01001110011001" when "001111011",
"01010010110000" when "001111100",
"01010100011110" when "001111101",
"01010001101011" when "001111110",
"01010011011001" when "001111111",
"11111110111011" when "010000000",
"00000000101001" when "010000001",
"11111101110110" when "010000010",
"11111111100100" when "010000011",
"00000011111011" when "010000100",
"00000101101001" when "010000101",
"00000010110110" when "010000110",
"00000100100100" when "010000111",
"00010000000000" when "010001000",
"00010001101110" when "010001001",
"00001110111011" when "010001010",
"00010000101001" when "010001011",
"00010101000000" when "010001100",
"00010110101110" when "010001101",
"00010011111011" when "010001110",
"00010101101001" when "010001111",
"00100101100001" when "010010000",
"00100111001111" when "010010001",
"00100100011100" when "010010010",
"00100110001010" when "010010011",
"00101010100001" when "010010100",
"00101100001111" when "010010101",
"00101001011100" when "010010110",
"00101011001010" when "010010111",
"00110110100110" when "010011000",
"00111000010100" when "010011001",
"00110101100001" when "010011010",
"00110111001111" when "010011011",
"00111011100110" when "010011100",
"00111101010100" when "010011101",
"00111010100001" when "010011110",
"00111100001111" when "010011111",
"00010000000000" when "010100000",
"00010001101110" when "010100001",
"00001110111011" when "010100010",
"00010000101001" when "010100011",
"00010101000000" when "010100100",
"00010110101110" when "010100101",
"00010011111011" when "010100110",
"00010101101001" when "010100111",
"00100001000101" when "010101000",
"00100010110011" when "010101001",
"00100000000000" when "010101010",
"00100001101110" when "010101011",
"00100110000101" when "010101100",
"00100111110011" when "010101101",
"00100101000000" when "010101110",
"00100110101110" when "010101111",
"00110110100110" when "010110000",
"00111000010100" when "010110001",
"00110101100001" when "010110010",
"00110111001111" when "010110011",
"00111011100110" when "010110100",
"00111101010100" when "010110101",
"00111010100001" when "010110110",
"00111100001111" when "010110111",
"01000111101011" when "010111000",
"01001001011001" when "010111001",
"01000110100110" when "010111010",
"01001000010100" when "010111011",
"01001100101011" when "010111100",
"01001110011001" when "010111101",
"01001011100110" when "010111110",
"01001101010100" when "010111111",
"00000011111011" when "011000000",
"00000101101001" when "011000001",
"00000010110110" when "011000010",
"00000100100100" when "011000011",
"00001000111011" when "011000100",
"00001010101001" when "011000101",
"00000111110110" when "011000110",
"00001001100100" when "011000111",
"00010101000000" when "011001000",
"00010110101110" when "011001001",
"00010011111011" when "011001010",
"00010101101001" when "011001011",
"00011010000000" when "011001100",
"00011011101110" when "011001101",
"00011000111011" when "011001110",
"00011010101001" when "011001111",
"00101010100001" when "011010000",
"00101100001111" when "011010001",
"00101001011100" when "011010010",
"00101011001010" when "011010011",
"00101111100001" when "011010100",
"00110001001111" when "011010101",
"00101110011100" when "011010110",
"00110000001010" when "011010111",
"00111011100110" when "011011000",
"00111101010100" when "011011001",
"00111010100001" when "011011010",
"00111100001111" when "011011011",
"01000000100110" when "011011100",
"01000010010100" when "011011101",
"00111111100001" when "011011110",
"01000001001111" when "011011111",
"00010101000000" when "011100000",
"00010110101110" when "011100001",
"00010011111011" when "011100010",
"00010101101001" when "011100011",
"00011010000000" when "011100100",
"00011011101110" when "011100101",
"00011000111011" when "011100110",
"00011010101001" when "011100111",
"00100110000101" when "011101000",
"00100111110011" when "011101001",
"00100101000000" when "011101010",
"00100110101110" when "011101011",
"00101011000101" when "011101100",
"00101100110011" when "011101101",
"00101010000000" when "011101110",
"00101011101110" when "011101111",
"00111011100110" when "011110000",
"00111101010100" when "011110001",
"00111010100001" when "011110010",
"00111100001111" when "011110011",
"01000000100110" when "011110100",
"01000010010100" when "011110101",
"00111111100001" when "011110110",
"01000001001111" when "011110111",
"01001100101011" when "011111000",
"01001110011001" when "011111001",
"01001011100110" when "011111010",
"01001101010100" when "011111011",
"01010001101011" when "011111100",
"01010011011001" when "011111101",
"01010000100110" when "011111110",
"01010010010100" when "011111111",
"00000001101110" when "100000000",
"00000011011100" when "100000001",
"00000000101001" when "100000010",
"00000010010111" when "100000011",
"00000110101110" when "100000100",
"00001000011100" when "100000101",
"00000101101001" when "100000110",
"00000111010111" when "100000111",
"00010010110011" when "100001000",
"00010100100001" when "100001001",
"00010001101110" when "100001010",
"00010011011100" when "100001011",
"00010111110011" when "100001100",
"00011001100001" when "100001101",
"00010110101110" when "100001110",
"00011000011100" when "100001111",
"00101000010100" when "100010000",
"00101010000010" when "100010001",
"00100111001111" when "100010010",
"00101000111101" when "100010011",
"00101101010100" when "100010100",
"00101111000010" when "100010101",
"00101100001111" when "100010110",
"00101101111101" when "100010111",
"00111001011001" when "100011000",
"00111011000111" when "100011001",
"00111000010100" when "100011010",
"00111010000010" when "100011011",
"00111110011001" when "100011100",
"01000000000111" when "100011101",
"00111101010100" when "100011110",
"00111111000010" when "100011111",
"00010010110011" when "100100000",
"00010100100001" when "100100001",
"00010001101110" when "100100010",
"00010011011100" when "100100011",
"00010111110011" when "100100100",
"00011001100001" when "100100101",
"00010110101110" when "100100110",
"00011000011100" when "100100111",
"00100011111000" when "100101000",
"00100101100110" when "100101001",
"00100010110011" when "100101010",
"00100100100001" when "100101011",
"00101000111000" when "100101100",
"00101010100110" when "100101101",
"00100111110011" when "100101110",
"00101001100001" when "100101111",
"00111001011001" when "100110000",
"00111011000111" when "100110001",
"00111000010100" when "100110010",
"00111010000010" when "100110011",
"00111110011001" when "100110100",
"01000000000111" when "100110101",
"00111101010100" when "100110110",
"00111111000010" when "100110111",
"01001010011110" when "100111000",
"01001100001100" when "100111001",
"01001001011001" when "100111010",
"01001011000111" when "100111011",
"01001111011110" when "100111100",
"01010001001100" when "100111101",
"01001110011001" when "100111110",
"01010000000111" when "100111111",
"00000110101110" when "101000000",
"00001000011100" when "101000001",
"00000101101001" when "101000010",
"00000111010111" when "101000011",
"00001011101110" when "101000100",
"00001101011100" when "101000101",
"00001010101001" when "101000110",
"00001100010111" when "101000111",
"00010111110011" when "101001000",
"00011001100001" when "101001001",
"00010110101110" when "101001010",
"00011000011100" when "101001011",
"00011100110011" when "101001100",
"00011110100001" when "101001101",
"00011011101110" when "101001110",
"00011101011100" when "101001111",
"00101101010100" when "101010000",
"00101111000010" when "101010001",
"00101100001111" when "101010010",
"00101101111101" when "101010011",
"00110010010100" when "101010100",
"00110100000010" when "101010101",
"00110001001111" when "101010110",
"00110010111101" when "101010111",
"00111110011001" when "101011000",
"01000000000111" when "101011001",
"00111101010100" when "101011010",
"00111111000010" when "101011011",
"01000011011001" when "101011100",
"01000101000111" when "101011101",
"01000010010100" when "101011110",
"01000100000010" when "101011111",
"00010111110011" when "101100000",
"00011001100001" when "101100001",
"00010110101110" when "101100010",
"00011000011100" when "101100011",
"00011100110011" when "101100100",
"00011110100001" when "101100101",
"00011011101110" when "101100110",
"00011101011100" when "101100111",
"00101000111000" when "101101000",
"00101010100110" when "101101001",
"00100111110011" when "101101010",
"00101001100001" when "101101011",
"00101101111000" when "101101100",
"00101111100110" when "101101101",
"00101100110011" when "101101110",
"00101110100001" when "101101111",
"00111110011001" when "101110000",
"01000000000111" when "101110001",
"00111101010100" when "101110010",
"00111111000010" when "101110011",
"01000011011001" when "101110100",
"01000101000111" when "101110101",
"01000010010100" when "101110110",
"01000100000010" when "101110111",
"01001111011110" when "101111000",
"01010001001100" when "101111001",
"01001110011001" when "101111010",
"01010000000111" when "101111011",
"01010100011110" when "101111100",
"01010110001100" when "101111101",
"01010011011001" when "101111110",
"01010101000111" when "101111111",
"00000000101001" when "110000000",
"00000010010111" when "110000001",
"11111111100100" when "110000010",
"00000001010010" when "110000011",
"00000101101001" when "110000100",
"00000111010111" when "110000101",
"00000100100100" when "110000110",
"00000110010010" when "110000111",
"00010001101110" when "110001000",
"00010011011100" when "110001001",
"00010000101001" when "110001010",
"00010010010111" when "110001011",
"00010110101110" when "110001100",
"00011000011100" when "110001101",
"00010101101001" when "110001110",
"00010111010111" when "110001111",
"00100111001111" when "110010000",
"00101000111101" when "110010001",
"00100110001010" when "110010010",
"00100111111000" when "110010011",
"00101100001111" when "110010100",
"00101101111101" when "110010101",
"00101011001010" when "110010110",
"00101100111000" when "110010111",
"00111000010100" when "110011000",
"00111010000010" when "110011001",
"00110111001111" when "110011010",
"00111000111101" when "110011011",
"00111101010100" when "110011100",
"00111111000010" when "110011101",
"00111100001111" when "110011110",
"00111101111101" when "110011111",
"00010001101110" when "110100000",
"00010011011100" when "110100001",
"00010000101001" when "110100010",
"00010010010111" when "110100011",
"00010110101110" when "110100100",
"00011000011100" when "110100101",
"00010101101001" when "110100110",
"00010111010111" when "110100111",
"00100010110011" when "110101000",
"00100100100001" when "110101001",
"00100001101110" when "110101010",
"00100011011100" when "110101011",
"00100111110011" when "110101100",
"00101001100001" when "110101101",
"00100110101110" when "110101110",
"00101000011100" when "110101111",
"00111000010100" when "110110000",
"00111010000010" when "110110001",
"00110111001111" when "110110010",
"00111000111101" when "110110011",
"00111101010100" when "110110100",
"00111111000010" when "110110101",
"00111100001111" when "110110110",
"00111101111101" when "110110111",
"01001001011001" when "110111000",
"01001011000111" when "110111001",
"01001000010100" when "110111010",
"01001010000010" when "110111011",
"01001110011001" when "110111100",
"01010000000111" when "110111101",
"01001101010100" when "110111110",
"01001111000010" when "110111111",
"00000101101001" when "111000000",
"00000111010111" when "111000001",
"00000100100100" when "111000010",
"00000110010010" when "111000011",
"00001010101001" when "111000100",
"00001100010111" when "111000101",
"00001001100100" when "111000110",
"00001011010010" when "111000111",
"00010110101110" when "111001000",
"00011000011100" when "111001001",
"00010101101001" when "111001010",
"00010111010111" when "111001011",
"00011011101110" when "111001100",
"00011101011100" when "111001101",
"00011010101001" when "111001110",
"00011100010111" when "111001111",
"00101100001111" when "111010000",
"00101101111101" when "111010001",
"00101011001010" when "111010010",
"00101100111000" when "111010011",
"00110001001111" when "111010100",
"00110010111101" when "111010101",
"00110000001010" when "111010110",
"00110001111000" when "111010111",
"00111101010100" when "111011000",
"00111111000010" when "111011001",
"00111100001111" when "111011010",
"00111101111101" when "111011011",
"01000010010100" when "111011100",
"01000100000010" when "111011101",
"01000001001111" when "111011110",
"01000010111101" when "111011111",
"00010110101110" when "111100000",
"00011000011100" when "111100001",
"00010101101001" when "111100010",
"00010111010111" when "111100011",
"00011011101110" when "111100100",
"00011101011100" when "111100101",
"00011010101001" when "111100110",
"00011100010111" when "111100111",
"00100111110011" when "111101000",
"00101001100001" when "111101001",
"00100110101110" when "111101010",
"00101000011100" when "111101011",
"00101100110011" when "111101100",
"00101110100001" when "111101101",
"00101011101110" when "111101110",
"00101101011100" when "111101111",
"00111101010100" when "111110000",
"00111111000010" when "111110001",
"00111100001111" when "111110010",
"00111101111101" when "111110011",
"01000010010100" when "111110100",
"01000100000010" when "111110101",
"01000001001111" when "111110110",
"01000010111101" when "111110111",
"01001110011001" when "111111000",
"01010000000111" when "111111001",
"01001101010100" when "111111010",
"01001111000010" when "111111011",
"01010011011001" when "111111100",
"01010101000111" when "111111101",
"01010010010100" when "111111110",
"01010100000010" when "111111111";
end arch;
顶级实体文件：
library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
entity top is
port(
clk, rst : in std_logic;
data_in : in std_logic_vector(7 downto 0);
data_out : out std_logic_vector(13 downto 0);
aaa : out unsigned(3 downto 0);
ena : out std_logic;
data_p : out std_logic_vector(8 downto 0)
);
end top;
architecture arch of top is
signal tablein : std_logic_vector(8 downto 0);
signal tableout: std_logic_vector(13 downto 0);
signal addout,add1,add2 : std_logic_vector(13 downto 0);
signal reg_in, reg_out : std_logic_vector(13 downto 0);
--signal tap0, tap1, tap2, tap3, tap4, tap5, tap6, tap7 : std_logic_vector(8 DOWNTO 0);
signal x0, x1, x2, x3, x4, x5, x6, x7, x8 : std_logic_vector(7 DOWNTO 0);
--signal y0, y1, y2, y3, y4, y5, y6, y7,y8 : std_logic_vector(13 downto 0);
--type TYPEX is array (8 downto 1) of std_logic_vector(8 downto 0);
type TYPET is array (0 to 7) of std_logic_vector(8 downto 0);
signal tap : TYPET;
--signal x : TYPEX;
signal i : unsigned(3 downto 0);
signal enaa : std_logic;
component reg
port(
clk, rst : in std_logic;
d : in std_logic_vector(13 downto 0);
q : out std_logic_vector(13 downto 0)
);
end component;
component add
port(
a,b : in std_logic_vector(13 downto 0);
s : out std_logic_vector(13 downto 0)
);
end component;
component lut_table
port(
table_in : in std_logic_vector(8 downto 0);
table_out : out std_logic_vector(13 downto 0)
);
end component;
begin
a2: add port map (
a => add1,
b => add2,
s => addout
);
a3: reg port map (
clk => clk,
rst => rst,
d => reg_in,
q => reg_out
);
lut: lut_table port map(
table_in => tablein,
table_out => tableout
);
add1 <= tableout;
add2 <= reg_out;
reg_in <= addout;
x0 <= data_in;
process(clk, enaa)
begin
if rising_edge(clk) and enaa = '1' then
x0 <= data_in;
x2 <= x1;
x3 <= x2;
x4 <= x3;
x5 <= x4;
x6 <= x5;
x7 <= x6;
x8 <= x7;
end if;
end process;
tap(0) <= (x8(0) & x7(0) & x6(0) & x5(0) & x4(0) & x3(0) & x2(0) & x1(0) & x0(0));
tap(1) <= (x8(1) & x7(1) & x6(1) & x5(1) & x4(1) & x3(1) & x2(1) & x1(1) & x0(1));
tap(2) <= (x8(2) & x7(2) & x6(2) & x5(2) & x4(2) & x3(2) & x2(2) & x1(2) & x0(2));
tap(3) <= (x8(3) & x7(3) & x6(3) & x5(3) & x4(3) & x3(3) & x2(3) & x1(3) & x0(3));
tap(4) <= (x8(4) & x7(4) & x6(4) & x5(4) & x4(4) & x3(4) & x2(4) & x1(4) & x0(4));
tap(5) <= (x8(5) & x7(5) & x6(5) & x5(5) & x4(5) & x3(5) & x2(5) & x1(5) & x0(5));
tap(6) <= (x8(6) & x7(6) & x6(6) & x5(6) & x4(6) & x3(6) & x2(6) & x1(6) & x0(6));
tap(7) <= (x8(7) & x7(7) & x6(7) & x5(7) & x4(7) & x3(7) & x1(7) & x1(7) & x0(7));
x0 <= data_in;
process(clk)
begin
if rst = '1' then
i <= "0000";
elsif rising_edge(clk) and i = "0001" then
enaa <= '1';
tablein <= tap(to_integer(i));
data_p <= tap(to_integer(i));
aaa <= i;
i <= i + "0001";
ena <= '1';
aaa <= i;
elsif rising_edge(clk) and i < "1000" then
i <= i + "0001";
enaa <= '0';
ena <= '0';
aaa <= i;
elsif rising_edge(clk) and i = "1000" then
enaa <= '0';
i <= "0001";
ena <= '0';
aaa <= i;
end if;
end process;
with enaa select
data_out <= reg_out when '1',
"00000000000000" when '0';
end arch;
我的顶级文件存在很大问题，因为我不知道如何将输入样本放入lut表并创建fsm。有人帮忙吗？
答案 0 :(得分：1)
关于查找表，如果将其创建为只读存储器块，将更容易处理。
这样的事情：
LIBRARY ieee;
USE ieee.std_logic_1164.all;
USE ieee.std_logic_unsigned.all;
entity lut_table is
port(
table_in : in std_logic_vector(8 downto 0);
table_out : out std_logic_vector(13 downto 0)
);
end lut_table;
Architecture ROM of lut_table is
-- Build a 2-D array type for the ROM
type rom_type is array (0 to 511) of std_logic_vector (13 downto 0);
constant rom_mem : rom_type := ("00000000000000",
"00000001101110",
"11111110111011",
...
"01010100000010"
);
begin
data_output <= rom_mem(conv_integer(address_in));
end ROM;
这样您就可以快速更改其内容。