di_led.vhd

来自「8.22出租车计价器VHDL程序与仿真。 --文件名：taxi.hd。 」· VHDL 代码 · 共 27 行

library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.STD_LOGIC_unsigned.ALL;
ENTITY di_LED IS;
port(d:in std_logic_ vector(3 downto 0);
      q:out std_logic_vector(6 downto 0));
     end di_LED;
architecture rt1 of di_LED is
begin
   process(d)
begin
   case d is
   when "0000"=>q<="0111111";
   when "0001"=>q<="0000110";
   when "0010"=>q<="1011011";
   when "0011"=>q<="1001111";
   when "0100"=>q<="1100110";
   when "0101"=>q<="1101101";
   when "0110"=>q<="1111101";
   when "0111"=>q<="0100111";
   when "1000"=>q<="1111111";
   when others=>q<="1101111";
end case;
end process;
end tr1;