求一VHDL语言的八位十进制频率计程序,要能下载实现功能的.谢谢,能用...答:signal e:std_logic_vector(3 downto 0);begin u1:cnt10 port map(fx=>fx,rst=>rst,ena=>ena,cout=>e(0),outy=>d(3 downto 0));u2:cnt10 port map(fx=>e(0),rst=>rst,ena=>ena,cout=>e(1),outy=>d(7 downto 4));u3:cnt10 port map(fx=>e(1),rst=>rst,ena=>...