标题: FPGA流水灯设计vhdl源程序 [打印本页]
作者: 柏林    时间: 2019-7-3 11:42
标题: FPGA流水灯设计vhdl源程序
自己做的FPGA流水灯设计


vhdl源程序如下:
  1. library ieee;
  2. use ieee.std_logic_1164.all;
  3. use ieee.std_logic_unsigned .all;
  4. entity liushuideng is
  5. port(clk:in std_logic;
  6. led:out std_logic_vector(7 downto 0));
  7. end entity;
  8. architecture bhv of liushuideng is
  9. signal clk1:std_logic;
  10. begin
  11. process(clk)
  12. variable num:integer range 1 to 25000000;
  13. begin
  14. if rising_edge (clk)then
  15. if num=25000000 then num:=1;clk1<=not clk1;
  16. else num:=num+1;
  17. end if;
  18. end if;
  19. end process;
  20. process(clk1)
  21. variable n:integer range 0 to 3;
  22. begin
  23. if rising_edge (clk1) then
  24. if n=3 then n:=0;
  25. else n:=n+1;
  26. end if ;
  27. end if;
  28. case n is
  29. when 0=>led<="10001000";
  30. when 1=>led<="01000100";
  31. when 2=>led<="00100010";
  32. when 3=>led<="00010001";
  33. when others=>led<="00000000";
  34. end case;
  35. end process;
  36. end bhv;
复制代码

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liushuideng.zip (7.42 MB, 下载次数: 40)






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