keyncode.vhd

来自「这是一个语音程序,通过VHDL编译了.大家可以直接调用.其中还包括了键盘程序有需」· VHDL 代码 · 共 29 行

LIBRARY IEEE;----库文件
USE IEEE.STD_LOGIC_1164.ALL;

ENTITY keyncode IS----实体
  PORT(
       key:IN STD_LOGIC_VECTOR(7 DOWNTO 0);
       q: OUT INTEGER RANGE 0 TO 7;
       spken: OUT STD_LOGIC);
END keyncode;

ARCHITECTURE beha OF keyncode IS----结构体
BEGIN
   PROCESS(key)----进程语句
   BEGIN 
      spken<='1';
      CASE key IS 
          WHEN "11111110"=>q<=0;  -----key0
          WHEN "11111101"=>q<=1;  -----key1
          WHEN "11111011"=>q<=2;  -----key2
          WHEN "11110111"=>q<=3;  -----key3
          WHEN "11101111"=>q<=4;  -----key4
          WHEN "11011111"=>q<=5;  -----key5
          WHEN "10111111"=>q<=6;  -----key6     
          WHEN "01111111"=>q<=7;  -----key7
          WHEN OTHERS =>spken<='0';
           END case;
   END PROCESS;
END beha;