文章主要介绍了使用VHDL实现数字频率计的功能，其中包含了各部件的VHDL语言描述，仿真和大致硬件框图，对于初学EDA者大有帮助。-The article introduces the VHDL realization of the functionality of the digital frequency meter, which contains the hardware block diagram of the various components of the VHDL languag