四VHDL模块的家庭，已经过测试，在ISE8.1通过

数字频率测量器，脉宽测量器。可测量多种频率波形的脉宽。(Digital frequency measurement device, pulse width measurement device. Measurement of the waveform of frequency pulse width)

Vhdl Golden Reference Guide.pdf

Designing a synchronous finite state machine (FSM) is a common task for a digital logic engineer. This paper discusses a variety of issues regarding FSM design using Synopsys Design Compiler. Verilog and VHDL coding styles are presented, and different methodologies are compared using real-world examples.

说明：  fpga程序，产生1pps脉冲信号，使用的verilog语言。(FPGA program generates 1 PPS pulse signal, using Verilog language.)

设计了一个异步时钟域间进行通行的模块，并采用Modelsim进行仿真验证，仿真结果满足预期的目的。-Designed an asynchronous clock domains between the passage of the module, and use Modelsim for simulation, the simulation results meet the intended purpose.

　M4A564/32 CPLD VHDLＡ程序，调试可用,51扩展.-M4A564/32 CPLD VHDLA procedures, debugging is available, 51 to expand.

用verilog编写在FLEX10K上实现的简易CPU-used in the preparation of Verilog FLEX10K achieve simple CPU

基本的usb驱动程序的编程方法,值得一看.-Basic programing method for USB driver, worth reading

dc的应用规范，以及一些基础的操作指导，注意事项等(dc application specification, as well as some basic instructions, precautions, etc.)

说明：  vivado的license ,可以用在2019.1,2019.2,在win10 64bit上已检验过.(It can used in vivado2019.1,2019.2)