fenping2.vhd

来自「数字波形存储器VHDL源码」· VHDL 代码 · 共 39 行

library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_unsigned.all;
entity fenping2 is
   port(clk_4m:in std_logic;
         clk2,clk3:out std_logic);

end;
architecture art of  fenping2 is
signal  cp2 ,cp3 :std_logic;
signal count:std_logic_vector(15 downto 0);
signal s: std_logic_vector(15 downto 0);

      begin
 process(clk_4m) is
       begin
          if(clk_4m'event and clk_4m='1') then
                if count="0000000000001000" then
                  count<=(others=>'0');cp2<=not cp2;
                else count<=count+1;
          end if;
        end if;
        clk2<=cp2;
  end process;
process(cp2) is
        begin
        if(cp2'event and cp2='1') then
                if s="0000000000000010" then
                  s<=(others=>'0');cp3<=not cp3;
                else s<=s+1;
          end if;
        end if;
            clk3<=cp3;
        end process;
       
end;