基于vhdl 格雷码编码器的设计

1. 首先定义输入和输出信号：

   entity gray_encoder is
      port (
         gray_in : in std_logic_vector(3 downto 0);
         binary_out : out std_logic_vector(3 downto 0)
      );
   end entity;

2. 然后定义内部信号：

   architecture behavioral of gray_encoder is
      signal temp : std_logic_vector(3 downto 0);
   begin

3. 接着使用一个进程来实现编码器的功能：

      process (gray_in)
      begin
         temp <= gray_in xor gray_in(3 downto 1) & '0';
         binary_out <= temp;
      end process;

4. 最后结束架构：

   end architecture;

完整代码如下：

entity gray_encoder is
   port (
      gray_in : in std_logic_vector(3 downto 0);
      binary_out : out std_logic_vector(3 downto 0)
   );
end entity;

architecture behavioral of gray_encoder is
   signal temp : std_logic_vector(3 downto 0);
begin
   process (gray_in)
   begin
      temp <= gray_in xor gray_in(3 downto 1) & '0';
      binary_out <= temp;
   end process;
end architecture;