bcd7.vhd

该芯片的功能是： ① 有一复位开关

library ieee;
use ieee.std_logic_1164.all;
entity bcd7 is
  port(q:in std_logic_vector(3 downto 0);
       segments:out std_logic_vector(1 to 7));
end bcd7;
architecture rtl of bcd7 is
begin
  process(q) 
  begin  
    case q is
       when "0000"=>segments<="1111110";
       when "0001"=>segments<="1100000";
       when "0010"=>segments<="1011011";
       when "0011"=>segments<="1110011";
       when "0100"=>segments<="1100101";
       when "0101"=>segments<="0110111";
       when "0110"=>segments<="0111111";
       when "0111"=>segments<="1100010";
       when "1000"=>segments<="1111111";
       when "1001"=>segments<="1110111";
       when "1010"=>segments<="1111001";
       when "1011"=>segments<="0111001";
       when "1100"=>segments<="0101001";       
       when "1101"=>segments<="0011111";
       when others=>segments<="0000000";
    end case;
  end process;
end rtl;