本文介绍了电机鉴向、四倍频的原理以及使用EMPM7128S 进行鉴向、四倍频、计 数的方法,并给出了相应的VHDL 程序和仿真图。 关键词:EPM7128S 鉴向四倍频 VHDL Abstract: This paper introduces the theory of accomplishing the direction and quadruple frequency. And then introduces the method of accomplishing the direction, quadruple frequency and count using EPM7128S. At last, this paper give the relevant program of VHDL and simulation figure. Keywords: EPM7128S accomplishing the direction quadruple frequency VHDL