traffic_ctr.txt

来自「最简便的交通灯控制源代码 适合VHDL初学者 十字路口红绿灯控制」· 文本 代码 · 共 66 行

library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_unsigned.all;

entity traffic_ctr is
  port(clk:in std_logic;
       dalu_dengse,xiaolu_dengse:out std_logic_vector(2 downto 0);
       dalu_shijianl,xiaolu_shijianl:out std_logic_vector(3 downto 0);
       dalu_shijianh,xiaolu_shijianh:out std_logic_vector(3 downto 0));
end;

architecture a of traffic_ctr is
  signal zdd:std_logic_vector(2 downto 0);
  signal zxd:std_logic_vector(2 downto 0);
  signal zds:std_logic_vector(7 downto 0);
  signal zxs:std_logic_vector(7 downto 0);
  signal ss:std_logic;
  signal m:std_logic;
begin
  process(clk)
  begin
     if clk'event and clk='1' then
        if m='0'then
           
        --if    zds>"00100111" or zxs>"00110000" then
              zds<="00100111";zdd<="001";
              zxs<="00110000";zxd<="100";
              m<='1';
       else
        if zds="00000001" and zxs="00000100" then
              zds<="00000011";zdd<="010";
              zxs<="00000011";zxd<="100";
              ss<='0';m<='1';
        elsif zds="00000001" and zxs="00000001" and ss='0' then
              zds<="00100000";zdd<="100";
              zxs<="00010111";zxd<="001";
              ss<='0';m<='1';
        elsif zds="00000100" and zxs="00000001" then
              zds<="00000011";zdd<="100";
              zxs<="00000011";zxd<="010";
              ss<='1';m<='1';
        elsif zds="00000001" and zxs="00000001" and ss='1' then
              zds<="00100111";zdd<="001";
              zxs<="00110000";zxd<="100";
              ss<='0';m<='1';
        elsif zds(3 downto 0)=0 then
              zds<=zds-7;
              zxs<=zxs-1;
        elsif zxs(3 downto 0)=0 then
              zxs<=zxs-7;
              zds<=zds-1;
        else  zds<=zds-1;
              zxs<=zxs-1;
        end if;
      end if;
     end if;
  end process;
  dalu_dengse<=zdd;
  xiaolu_dengse<=zxd;
  dalu_shijianl<=zds(3 downto 0);
  xiaolu_shijianl<=zxs(3 downto 0);
  dalu_shijianh<=zds(7 downto 4);
  xiaolu_shijianh<=zxs(7 downto 4);

end;