请高人帮帮分析这段小程序

只看该作者 · 2010-4-23 21:36

library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_arith.all;
use ieee.std_logic_unsigned.all;
entity Decoder is
  port (
      Coder_In:in std_logic_vector(4 downto 0);
   Code_out:out std_logic_vector(31 downto 0)
   );
end;
architecture behavioral of Decoder is
begin
process (Coder_In)
begin
   case Coder_In is
   WHEN "00000" =>Code_out<="11111111111111111111111111111110";
  WHEN "00001" =>Code_out<="11111111111111111111111111111101";
  WHEN "00010" =>Code_out<="11111111111111111111111111111011";
  WHEN "00011" =>Code_out<="11111111111111111111111111110111";
  WHEN "00100" =>Code_out<="11111111111111111111111111101111";
  WHEN "00101" =>Code_out<="11111111111111111111111111011111";
  WHEN "00110" =>Code_out<="11111111111111111111111110111111";
  WHEN "00111" =>Code_out<="11111111111111111111111101111111";
  WHEN "01000" =>Code_out<="11111111111111111111111011111111";
  WHEN "01001" =>Code_out<="11111111111111111111110111111111";
  WHEN "01010" =>Code_out<="11111111111111111111101111111111";
  WHEN "01011" =>Code_out<="11111111111111111111011111111111";
  WHEN "01100" =>Code_out<="11111111111111111110111111111111";
  WHEN "01101" =>Code_out<="11111111111111111101111111111111";
  WHEN "01110" =>Code_out<="11111111111111111011111111111111";
  WHEN "01111" =>Code_out<="11111111111111110111111111111111";
  WHEN "10000" =>Code_out<="11111111111111101111111111111111";
  WHEN "10001" =>Code_out<="11111111111111011111111111111111";
  WHEN "10010" =>Code_out<="11111111111110111111111111111111";
  WHEN "10011" =>Code_out<="11111111111101111111111111111111";
  WHEN "10100" =>Code_out<="11111111111011111111111111111111";
  WHEN "10101" =>Code_out<="11111111110111111111111111111111";
  WHEN "10110" =>Code_out<="11111111101111111111111111111111";
  WHEN "10111" =>Code_out<="11111111011111111111111111111111";
  WHEN "11000" =>Code_out<="11111110111111111111111111111111";
  WHEN "11001" =>Code_out<="11111101111111111111111111111111";
  WHEN "11010" =>Code_out<="11111011111111111111111111111111";
  WHEN "11011" =>Code_out<="11110111111111111111111111111111";
  WHEN "11100" =>Code_out<="11101111111111111111111111111111";
  WHEN "11101" =>Code_out<="11011111111111111111111111111111";
  WHEN "11110" =>Code_out<="10111111111111111111111111111111";
  WHEN "11111" =>Code_out<="01111111111111111111111111111111";
   WHEN others  =>Code_out<="11111111111111111111111111111111";
end case;
end process;
end;

编译后结果是
所有输出端口 stuck at GND ，如
。。。
Warning: Pin "Rev_Sel_22" stuck at GND
。。。

输入无效，如：
。。。
Warning: No output dependent on input pin "Send_Grp_Dr[4]"

其中Rev_Sel_22和Send_Grp_Dr都是接在模块上的输出输入端口，咋回事啊，百思不得其解
。。。

只看该作者 · 2010-4-24 12:20

我帮你编译了一下，没有错误了：
library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_arith.all;
use ieee.std_logic_unsigned.all;
entity Decoder is
port( Coder_In:in std_logic_vector(4 downto 0);
Code_out:out std_logic_vector(31 downto 0)
);
end;

architecture behavioral of Decoder is
begin
process (Coder_In)
begin
case Coder_In is
WHEN "00000" =>Code_out<="11111111111111111111111111111110";
WHEN "00001" =>Code_out<="11111111111111111111111111111101";
WHEN "00010" =>Code_out<="11111111111111111111111111111011";
WHEN "00011" =>Code_out<="11111111111111111111111111110111";
WHEN "00100" =>Code_out<="11111111111111111111111111101111";
WHEN "00101" =>Code_out<="11111111111111111111111111011111";
WHEN "00110" =>Code_out<="11111111111111111111111110111111";
WHEN "00111" =>Code_out<="11111111111111111111111101111111";
WHEN "01000" =>Code_out<="11111111111111111111111011111111";
WHEN "01001" =>Code_out<="11111111111111111111110111111111";
WHEN "01010" =>Code_out<="11111111111111111111101111111111";
WHEN "01011" =>Code_out<="11111111111111111111011111111111";
WHEN "01100" =>Code_out<="11111111111111111110111111111111";
WHEN "01101" =>Code_out<="11111111111111111101111111111111";
WHEN "01110" =>Code_out<="11111111111111111011111111111111";
WHEN "01111" =>Code_out<="11111111111111110111111111111111";
WHEN "10000" =>Code_out<="11111111111111101111111111111111";
WHEN "10001" =>Code_out<="11111111111111011111111111111111";
WHEN "10010" =>Code_out<="11111111111110111111111111111111";
WHEN "10011" =>Code_out<="11111111111101111111111111111111";
WHEN "10100" =>Code_out<="11111111111011111111111111111111";
WHEN "10101" =>Code_out<="11111111110111111111111111111111";
WHEN "10110" =>Code_out<="11111111101111111111111111111111";
WHEN "10111" =>Code_out<="11111111011111111111111111111111";
WHEN "11000" =>Code_out<="11111110111111111111111111111111";
WHEN "11001" =>Code_out<="11111101111111111111111111111111";
WHEN "11010" =>Code_out<="11111011111111111111111111111111";
WHEN "11011" =>Code_out<="11110111111111111111111111111111";
WHEN "11100" =>Code_out<="11101111111111111111111111111111";
WHEN "11101" =>Code_out<="11011111111111111111111111111111";
WHEN "11110" =>Code_out<="10111111111111111111111111111111";
WHEN "11111" =>Code_out<="01111111111111111111111111111111";
WHEN others =>Code_out<="11111111111111111111111111111111";
end case;
end process;
end;

只看该作者 · 2010-4-24 12:22

但是要把QQ表情那里修改一下，他遮住了几个字母，完整的是：
Code_out:out std_logic_vector(31 downto 0)

只看该作者 · 2010-4-24 12:24

:L怎么这个QQ表情老是在那个位置啊，，

只看该作者 · 2010-4-24 22:49

二楼的代码风格很好:) 值得提倡

请高人帮帮分析这段小程序

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