求高手帮我看下这个键盘编码模块到底哪有问题？

zylwzg · 发表于 2011-4-9 17:38

EDA365欢迎您！

您需要登录才可以下载或查看，没有帐号？注册

x

为什么我的max plus ||一编译就出现一个错误？代码如下：
LIBRARY IEEE;
USE IEEE.STD_LOGIC_1164.ALL;
USE IEEE.STD_LOGIC_ARITH.ALL;
USE IEEE.STD_LOGIC_UNSIGNED.ALL;
ENTITY KEYDECODER IS
PORT (
   KEY_IN: IN STD_LOGIC_VECTOR(3 DOWNTO 0); --键盘输入
KEY_DRV: IN STD_LOGIC_VECTOR(3 DOWNTO 0);--键盘输出
      CLK: IN STD_LOGIC;             --全局时钟
      CLK_SCAN: IN STD_LOGIC;                --扫描时钟
KEYVALUE: OUT STD_LOGIC_VECTOR(3 DOWNTO 0);--键盘的键值
KEY_PRESSED: OUT STD_LOGIC); --有键盘按下去的标志
END KEYDECODER;
ARCHITECTURE BEHAVIORAL OF KEYDECODER IS
SIGNAL TEMP:STD_LOGIC_VECTOR(7 DOWNTO 0); --键盘的输入信号
SIGNAL TEMP_PRESEED:STD_LOGIC;--键盘按下标志位
SIGNAL TEMP1,TEMP2,TEMP3,TEMP4,TEMP5,TEMP6:STD_LOGIC; --同步化信号
SIGNAL KEY_PRESSED_ASY:STD_LOGIC;
BEGIN
TEMP<=KEY_DRV&KEY_IN;
PROCESS(TEMP)
BEGIN
   CASE TEMP IS
   WHEN "11101110"=>KEYVALUE<=CONV_STD_LOGIC_VECTOR(1,4);
   TEMP_PRESEED<='1';
   WHEN "11101101"=>KEYVALUE<=CONV_STD_LOGIC_VECTOR(2,4);
   TEMP_PRESEED<='1';
   WHEN "11101011"=>KEYVALUE<=CONV_STD_LOGIC_VECTOR(3,4);
   TEMP_PRESEED<='1';
   WHEN "11100111"=>KEYVALUE<=CONV_STD_LOGIC_VECTOR(4,4);
      TEMP_PRESEED<='1';
   WHEN "11011110"=>KEYVALUE<=CONV_STD_LOGIC_VECTOR(5,4);
      TEMP_PRESEED<='1';
   WHEN "11011101"=>KEYVALUE<=CONV_STD_LOGIC_VECTOR(6,4);
      TEMP_PRESEED<='1';
   WHEN "11011011"=>KEYVALUE<=CONV_STD_LOGIC_VECTOR(7,4);
      TEMP_PRESEED<='1';
   WHEN "11010111"=>KEYVALUE<=CONV_STD_LOGIC_VECTOR(8,4);
      TEMP_PRESEED<='1';
   WHEN "10111110"=>KEYVALUE<=CONV_STD_LOGIC_VECTOR(9,4);
   TEMP_PRESEED<='1';
   WHEN "10111101"=>KEYVALUE<=CONV_STD_LOGIC_VECTOR(10,4);
   TEMP_PRESEED<='1';
   WHEN "10111011"=>KEYVALUE<=CONV_STD_LOGIC_VECTOR(11,4);
   TEMP_PRESEED<='1';
   WHEN "10110111"=>KEYVALUE<=CONV_STD_LOGIC_VECTOR(12,4);
   TEMP_PRESEED<='1';
   WHEN "01111110"=>KEYVALUE<=CONV_STD_LOGIC_VECTOR(13,4);
   TEMP_PRESEED<='1';
   WHEN "01111101"=>KEYVALUE<=CONV_STD_LOGIC_VECTOR(14,4);
      TEMP_PRESEED<='1';
   WHEN "01111011"=>KEYVALUE<=CONV_STD_LOGIC_VECTOR(15,4);
   TEMP_PRESEED<='1';
   WHEN "01110111"=>KEYVALUE<=CONV_STD_LOGIC_VECTOR(16,4);
   TEMP_PRESEED<='1';
   WHEN OTHERS=>TEMP_PRESEED<='0';
         END CASE;
END PROCESS;
      PROCESS(CLK_SCAN)
      BEGIN
IF(CLK_SCAN'EVENT AND CLK_SCAN='1') THEN
TEMP1<=TEMP_PRESEED;
TEMP2<=TEMP1;
TEMP3<=TEMP2;
TEMP4<=TEMP3;
      END IF;
KEY_PRESSED_ASY<=TEMP1 OR TEMP2 OR TEMP3 OR TEMP4;
      END PROCESS;
      PROCESS(CLK)
BEGIN
  IF(CLK'EVENT AND CLK='1')THEN
TEMP5<=KEY_PRESSED_ASY;
TEMP6<=TEMP5;
  END IF;
  KEY_PRESSED<=TEMP5 AND (NOT(TEMP6));
END PROCESS;
END BEHAVIORAL;