prioritycoder.vhd

来自「我们学校做VHDL实验的源码」· VHDL 代码 · 共 27 行

LIBRARY IEEE;
USE IEEE.STD_LOGIC_1164.ALL;
USE IEEE.STD_LOGIC_UNSIGNED.ALL;
ENTITY PRIORITYCODER IS
  PORT(EN: IN STD_LOGIC;
        A:IN STD_LOGIC_VECTOR(6 DOWNTO 0);
        B:OUT STD_LOGIC_VECTOR(2 DOWNTO 0)
      );
END ENTITY;
ARCHITECTURE BHV OF PRIOTITYCODER IS
 BEGIN
  PROCESS(EN,A)
  BEGIN
  IF(EN='1') THEN B<="111";
    ELSIF(A6='0') B<="110"; 
    ELSIF(A5='0') B<="101";
    ELSIF(A4='0') B<="100";
    ELSIF(A3='0') B<="011";
    ELSIF(A2='0') B<="010";
    ELSIF(A1='0') B<="001";
    ELSIF(A0='0') B<="000";
   END IF;
     
 END PROCESS;
END BHV;