vhdl实现奇数和偶数的分频，因偶数的分频有很多历程，但奇数的分析较为繁琐，故将此结合到一起便于分析操作和分析。-VHDL to achieve the odd and even frequency, the frequency of the Division has a lot of history, but the odd number of analysis is more cumbersome, it will be combined to facilitate the analysis