fpq128.vhd

自己编的一个分频器的程序模版 虽然原理很简单

--分频器
LIBRARY ieee;
USE ieee.std_logic_1164.all;
ENTITY fpq128 IS
	PORT
	( clk	: IN	std_logic;
	  bout	: out std_logic);
    END fpq128;

ARCHITECTURE fpq128_arc OF fpq128 Is
 SIGNAL cnt1:  std_logic;
begin
 process(clk)
    VARIABLE cnt :  INTEGER RANGE 0 TO 128;
    constant modulus:integer:=64;
begin
if (clk'event and clk='1') then
  if cnt=modulus then
     cnt:=0; cnt1<=not cnt1; bout<=cnt1;
  end if;
     cnt:=cnt+1;
  end if;
end process;
end fpq128_arc;