testctl.vhd

8位十进制频率计,通过验证,目标芯片EPF10KLC84-4

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 entity testctl;

architecture art of testctl is
	signal div2clk:std_logic;
		begin
			process(clk) is
				begin
					if clk'event and clk='1' then
					div2clk<=not div2clk;
					end if;
			end process;

			process(clk,div2clk) is
				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 art;