本文描述的是数字式频率计的设计过程，其中包含了所用到的VHDl语言的源代码，和仿真图型，是比较完整描述的设计数字频率计的文章-This article describes the digital frequency of the design process, which includes the use of language VHDl source code, graphics and simulation, which is a more complete descr iption of

基于vhdl的频率计源代码，分层设计，代码可以直接运行-Vhdl frequency meter source code, hierarchical design, code can be run directly

FPGA关于简易数字频率计的设计方案，其中包括源代码和部分仿真结果-FPGA on simple digital frequency meter design, which includes source code and some simulation results

FPGA有价值的27个例子，其中包括LED控制，频率计，电子琴等基于状态机的经典例子，简单的编码调制等等。源代码以文档形式给出。-Examples of valuable FPGA 27 includes an LED control, frequency, keyboard, etc. The classic example of a state machine based on the simple coding and modulation and so on.