?? fenping7.vhd
字號:
library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_unsigned.all;
entity fenping7 is
port(clk_4m:in std_logic;
clk12,clk13:out std_logic);
end;
architecture art of fenping7 is
signal cp12 ,cp13 :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 s="0010000000000000" then
s<=(others=>'0');cp12<=not cp12;
else s<=s+1;
end if;
end if;
clk12<=cp12;
end process;
process(cp12) is
begin
if(cp12'event and cp12='1') then
if count="0000000000000010" then
count<=(others=>'0');cp13<=not cp13;
else count<=count+1;
end if;
end if;
clk13<=cp13;
end process;
end;
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