VHDLで反転操作を完璧にマスター！10の詳細なサンプルコードと使い方

ENTITY inversion IS
PORT ( A : IN STD_LOGIC;
Y : OUT STD_LOGIC);
END inversion;

ARCHITECTURE behavior OF inversion IS
BEGIN
Y <= NOT A;
END behavior;

ENTITY multi_inversion IS
    PORT ( A : IN STD_LOGIC_VECTOR(7 DOWNTO 0);
           Y : OUT STD_LOGIC_VECTOR(7 DOWNTO 0));
END multi_inversion;

ARCHITECTURE behavior OF multi_inversion IS
BEGIN
    Y <= NOT A;
END behavior;

ENTITY conditional_inversion IS
    PORT ( A : IN STD_LOGIC;
           B : IN STD_LOGIC;
           Y : OUT STD_LOGIC);
END conditional_inversion;

ARCHITECTURE behavior OF conditional_inversion IS
BEGIN
    Y <= NOT B WHEN A = '1' ELSE B;
END behavior;

library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.STD_LOGIC_ARITH.ALL;
use IEEE.STD_LOGIC_UNSIGNED.ALL;

entity inversion_example is
    Port ( A : in  STD_LOGIC_VECTOR(3 downto 0);
           B : in  STD_LOGIC_VECTOR(3 downto 0);
           C : out  STD_LOGIC_VECTOR(3 downto 0));
end inversion_example;

architecture Behavioral of inversion_example is
begin
    C <= not(A + B);  -- 加算結果を反転
end Behavioral;

library IEEE;
use IEEE.STD_LOGIC_1164.ALL;

entity sensor_inversion is
    Port ( sensor_value : in  STD_LOGIC_VECTOR(7 downto 0);
           threshold   : in  STD_LOGIC_VECTOR(7 downto 0);
           output_data : out STD_LOGIC_VECTOR(7 downto 0));
end sensor_inversion;

architecture Behavioral of sensor_inversion is
begin
    process(sensor_value, threshold)
    begin
        if sensor_value > threshold then
            output_data <= not sensor_value;  -- センサー値が閾値より大きい場合、反転
        else
            output_data <= sensor_value;
        end if;
    end process;
end Behavioral;

-- このコードは簡略化のため、具体的なフィルタ処理は表していません。
-- 仮にフィルタ処理後のデータが`data_filtered`として得られたと仮定します。
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;

entity filter_inversion is
    Port ( data_input    : in  STD_LOGIC_VECTOR(7 downto 0);
           data_filtered : out STD_LOGIC_VECTOR(7 downto 0);
           data_inverted : out STD_LOGIC_VECTOR(7 downto 0));
end filter_inversion;

architecture Behavioral of filter_inversion is
begin
    -- フィルタ処理 (簡略化)
    data_filtered <= data_input;  -- 仮のフィルタ処理
    data_inverted <= not data_filtered;  -- フィルタ後のデータを反転
end Behavioral;

library IEEE;
use IEEE.STD_LOGIC_1164.ALL;

entity device_control is
    Port ( control_signal : in  STD_LOGIC_VECTOR(3 downto 0);
           condition     : in  STD_LOGIC;
           output_signal : out STD_LOGIC_VECTOR(

3 downto 0));
end device_control;

architecture Behavioral of device_control is
begin
    process(control_signal, condition)
    begin
        if condition = '1' then  -- 条件が真の場合、制御信号を反転
            output_signal <= not control_signal;
        else
            output_signal <= control_signal;
        end if;
    end process;
end Behavioral;

library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.STD_LOGIC_ARITH.ALL;
use IEEE.STD_LOGIC_UNSIGNED.ALL;

entity memory_inversion is
    Port ( clk         : in STD_LOGIC;
           write_en    : in STD_LOGIC;
           read_en     : in STD_LOGIC;
           address     : in STD_LOGIC_VECTOR(3 downto 0);
           data_input  : in STD_LOGIC_VECTOR(7 downto 0);
           data_output : out STD_LOGIC_VECTOR(7 downto 0));
end memory_inversion;

architecture Behavioral of memory_inversion is
    type ram_type is array(15 downto 0) of STD_LOGIC_VECTOR(7 downto 0);
    signal ram : ram_type := (others => "00000000");

begin
    process(clk)
    begin
        if rising_edge(clk) then
            if read_en = '1' then
                data_output <= not ram(to_integer(address));
            end if;

            if write_en = '1' then
                ram(to_integer(address)) <= data_input;
            end if;
        end if;
    end process;
end Behavioral;

library IEEE;
use IEEE.STD_LOGIC_1164.ALL;

entity invert_input is
    Port ( ext_input : in  STD_LOGIC;
           ext_output : out STD_LOGIC);
end invert_input;

architecture Behavior of invert_input is
begin
    process(ext_input)
    begin
        ext_output <= not ext_input;
    end process;
end Behavior;

library IEEE;
use IEEE.STD_LOGIC_1164.ALL;

entity DebugFlip is
    Port ( input_signal : in STD_LOGIC;
           output_signal : out STD_LOGIC);
end DebugFlip;

architecture Behavioral of DebugFlip is
begin
    process(input_signal)
    begin
        -- 入力信号が'1'のときに出力信号を反転
        if input_signal = '1' then
            output_signal <= not output_signal;
        else
            output_signal <= '0';
        end if;
    end process;
end Behavioral;

signal a : std_logic_vector(3 downto 0);
signal b : std_logic_vector(4 downto 0);
begin
a <= not b;

signal a : std_logic;
signal b : std_logic_vector(3 downto 0);
begin
a <= not b;

signal a, b, mask : std_logic_vector(3 downto 0);
begin
b <= (a and mask) or (not a and not mask);