摘要: 文中介绍了数字频率计的结构、工作原理及计数方式，给出了基于VHDL语言的频率计系统的行为源描述，讨论了在VHDL的高级综合系统QuartusII的支持下，自顶向下地进行传输模块的设计工程，并给出了系统的仿真波形以及其应用实践。-Abstract : This paper introduces a digital frequency of the structure and working principle and counting, is based on VHDL Frequency System Descr iption of the sources discussed in the high-level synthesis VHDL Quartus II system, with the support of top-down transmission module for the design engineering, and the system the simulation waveforms and its application practices.