b3x8.vhd

这是一个用VHDL语言写的数码管程序.有用着

LIBRARY IEEE;
USE IEEE.STD_LOGIC_1164.ALL;
USE IEEE.STD_LOGIC_ARITH.ALL;
USE IEEE.STD_LOGIC_UNSIGNED.ALL;

entity b3x8 is
 PORT (CPS : IN STD_LOGIC_VECTOR( 2 DOWNTO 0) ;
        YO  : OUT STD_LOGIC_VECTOR( 7 DOWNTO 0)) ;
end;

architecture behv1 of b3x8 is
BEGIN
 WITH CPS SELECT 
     YO<= "00000001" WHEN "000",
         "00000010" WHEN "001",
         "00000100" WHEN "010",
         "00001000" WHEN "011",
         "00010000" WHEN "100",
         "00100000" WHEN "101",
         "01000000" WHEN "110",
         "10000000" WHEN "111";
end behv1;