ymq是什麽意思

YMQ
七段译码显示器，输出0～9的数据在显示屏上。
设计的原理图模块：

设计源程序
LIBRARY IEEE;
USE IEEE.STD_LOGIC_1164.ALL;
USE IEEE.STD_LOGIC_UNSIGNED.ALL;
ENTITY YMQ IS
PORT(AIN4:IN STD_LOGIC_VECTOR(3 DOWNTO 0);
DOUT7: OUT STD_LOGIC_VECTOR(6 DOWNTO 0));
END ENTITY YMQ;
ARCHITECTURE ART OF YMQ IS
BEGIN
PROCESS(AIN4) IS
BEGIN
CASE AIN4 IS
WHEN "0000"=>DOUT7<="0111111";
WHEN "0001"=>DOUT7<="0000110";
WHEN "0010"=>DOUT7<="1011011";
WHEN "0011"=>DOUT7<="1001111";
WHEN "0100"=>DOUT7<="1100110";
WHEN "0101"=>DOUT7<="1101101";
WHEN "0110"=>DOUT7<="1111101";
WHEN "0111"=>DOUT7<="0000111";
WHEN "1000"=>DOUT7<="1111111";
WHEN "1001"=>DOUT7<="1101111";
WHEN OTHERS=>DOUT7<="0000000";
END CASE;
END PROCESS;
END ARCHITECTURE ART;