display.vhd

实现60进制的计数

--display
library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_unsigned.all;
entity display is
port(din0:in std_logic_vector(3 downto 0);
     din1:in std_logic_vector(3 downto 0);
     din2:in std_logic_vector(3 downto 0);
     din3:in std_logic_vector(3 downto 0);
     din4:in std_logic_vector(3 downto 0); 
     din5:in std_logic_vector(3 downto 0);
     clk:in std_logic; 

     led_sa:out std_logic;
     led_sb:out std_logic;
     led_sc:out std_logic;

     led_a:out std_logic;
     led_b:out std_logic;
     led_c:out std_logic;
     led_d:out std_logic;
     led_e:out std_logic;
     led_f:out std_logic;
     led_g:out std_logic;
     led_dp:out std_logic);
end display;
architecture behav of display is
   signal seg:std_logic_vector(6 downto 0);
   signal sel:std_logic_vector(2 downto 0);
   signal num:std_logic_vector(3 downto 0);
   signal s:std_logic_vector(2 downto 0);
begin
   led_sa<=sel(0);
   led_sb<=sel(1);
   led_sc<=sel(2);
   led_a<=seg(0);
   led_b<=seg(1);
   led_c<=seg(2);
   led_d<=seg(3);
   led_e<=seg(4);
   led_f<=seg(5);
   led_g<=seg(6);
process(clk)
begin
if clk'event and clk='1' then
          if s="101" then
       s<="000";
     else
       s<=s+'1';
          end if;
 end if;
end process;

process(s,din0,din1,din2,din3,din4,din5)
begin
   if s="000" then
      sel<="000";
          num<=din0;
    elsif s="001" then
      sel<="001";
           num<=din1;
           led_dp<='0';
    elsif s="010" then
      sel<="010";
           num<=din2;
           led_dp<='0';
    elsif s="011" then
      sel<="011";
           num<=din3;
           led_dp<='0';
    elsif s="100" then
      sel<="100";
           num<=din4;
           led_dp<='0';
    elsif s="101" then
      sel<="101";
           num<=din5;
           led_dp<='0';
    else
       sel<="XXX";
       num<="XXXX";
       led_dp<='0';
  end if;
end process;
seg<="0111111" when num=0 else
      "0000110" when num=1 else
      "1011011" when num=2 else
      "1001111" when num=3 else
      "1100110" when num=4 else
      "1101101" when num=5 else
      "1111101" when num=6 else
      "0000111" when num=7 else
      "1111111" when num=8 else
      "1101111" when num=9 else
      "1110111" when num=10 else
      "1111100" when num=11 else
      "0111001" when num=12 else
      "1011110" when num=13 else
      "1111001" when num=14 else
      "1110001" when num=15 else
     "0000000";
end behav;