xzq31.vhd

请先删除编译后的debug/release目录以减少压缩包大小

LIBRARY IEEE;
USE IEEE.STD_LOGIC_1164.ALL;
ENTITY xzq31 IS
  PORT( INPUT: IN STD_LOGIC_VECTOR(11 DOWNTO 0);
          SES:IN STD_LOGIC_VECTOR(1 DOWNTO 0);
           Q:OUT STD_LOGIC_VECTOR(3 DOWNTO 0));
END xzq31;
ARCHITECTURE XZQ31JGT OF xzq31 IS
BEGIN
PROCESS(SES,INPUT)
BEGIN
  CASE SES IS
    WHEN "01"=>Q<=INPUT(11 DOWNTO 8);
    WHEN "10"=>Q<=INPUT(7 DOWNTO 4);
    WHEN "11"=>Q<=INPUT(3 DOWNTO 0);
    WHEN OTHERS=>Q<="0000";
  END CASE;
END PROCESS;
END XZQ31JGT;