fenping3.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 fenping3 is
   port(clk_4m:in std_logic;
         clk4,clk5:out std_logic);

end;
architecture art of  fenping3 is
signal  cp4 ,cp5 :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="0000000000100000" then
                  count<=(others=>'0');cp4<=not cp4;
                else count<=count+1;
          end if;
        end if;
        clk4<=cp4;
  end process;
process(cp4) is
        begin
        if(cp4'event and cp4='1') then
                if s="0000000000000010" then
                  s<=(others=>'0');cp5<=not cp5;
                else s<=s+1;
          end if;
        end if;
            clk5<=cp5;
        end process;
       
end;