testctl.vhd

来自「几个VHDL实现的源程序及其代码」· VHDL 代码 · 共 34 行

library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_unsigned.all;

entity testctl is
port(
  clk : in std_logic;
  tsten : out std_logic;
  clr_cnt : out std_logic;
  load : out std_logic);
end testctl;

architecture behav of testctl is
signal div2clk : std_logic;
begin
process(clk)
begin
if(clk'event and clk='1') then 
div2clk<=not div2clk;
end if;
end process;
process(clk,div2clk)
begin
if(clk='0' and div2clk='0') then
clr_cnt<='1';
else
clr_cnt<='0';
end if;
end process;
load<=not div2clk;
tsten<=div2clk;
end behav;