用键盘控制FPGA，再由FPGA控制VGA显示器是好东西

PLL中的TDC和DCO代码,是TI公司团队的，相当经典的代码，非常不错(the code of TDC and DCO)

本系统用于GPS中频部分的窄带滤波（AD后的数据经过LMS滤波后去掉窄带干扰，可以抑制20dB以上的干扰）(this system can be imply to anti-narrowband-jamming for GPS IF signal, it can degrade 20dB narrowband jamming)

自己写的pwm占空比采集与输出 但是没有计算占空比，如果又需要可以自己修改计算并显示占空比，该程序已经测试过了，可以使用，拿出来供大家分享，新手写的如有不足请大牛带飞。

Simple SPI interface realization on Verilog HDL with parameterized FIFO and APB interface

verilog da0832 cpldfpga control-verilog da0832 cpldfpga control

crazy bingo 韩彬将要出版的新书《FPGA设计技巧与案例开发详解》中的所有配套例程源码，主要涉及视频开发方向。(All the supporting source code routines crazy bingo Han Bin will be published book FPGA design techniques and case development explain in the video, mainly relates to the development direction of.)

这是一本介绍FPGA设计过程中关键问题的资料书,对参加面试或工程设计有一定帮助-This is an FPGA design process, introduce the key issues of information written on the interview or take part in engineering design has a certain extent, help

vhdl经典源代码――ps2接口设计，入门者必须掌握-vhdl classical source code-- ps2 interface design, beginners must master

EDA 正弦信号发生器：正弦信号发生器的结构有四部分组成，如图1所示。20MHZ经锁相环PLL20输出一路倍频的32MHZ片内时钟,16位计数器或分频器CNT6，6位计数器或地址发生器CN6，正弦波数据存储器data_rom。另外还需D/A0832（图中未画出）将数字信号转化为模拟信号。此设计中利用锁相环PLL20输入频率为20MHZ的时钟，输出一路分频的频率为32MHZ的片内时钟，与直接来自外部的时钟相比，这种片内时钟可以减少时钟延时和时钟变形，以减少片外干扰 还可以改善时钟的建立时间和保持时间，是系统稳定工作的保证。CNT6用来将32MHZ进行8分频得到4096HZ的频率提供给CN6与data_rom时钟信号。由CLK端输入20MHZ的时钟信号，在DOUT端就可输出稳定的正弦信号。(Sine signal generator has the structure of four parts, as shown in figure 1 below. The 20 MHZ phase lock loop PLL20 output all the way of frequency doubled within 32 MHZ slice clock, 16 counter or prescaler CNT6, six counter or address generator CN6, sine data storage data_rom. In addition to D/A0832 (shown in not draw) will digital signal into analog signals. This design using the phase lock loop PLL20 input frequency for 20 MHZ clock, the output of the frequency of all points frequency of 32 pieces (MHZ clock, and comes directly from the external clock, compared to this piece of clock can reduce the clock in delay and clock deformation, to reduce the interference of Can also improve the establishment of the clock time and keep time, is the system stability of assurance. CNT6 used to will and to 8 MHZ get 4096 HZ dividing the frequency to provide CN6 and data_rom clock signal. The input by CLK 20 MHZ clock signal, in DOUT end can output stable sine signals. )

数控分频器的设计 数控分频器的功能就是当在输入端给定不同输入数据时，将对输入的时钟信号有不同的分频比，例3的数控分频器就是用计数值可并行预置的加法计数器设计完成的，方法是将计数溢出位与预置数加载输入信号相接即可。(NC NC divider divider design of its function is when the input given different input data, input the clock signal will have different frequency than, for example 3 is to use the NC prescaler count preset value of the adder parallel counter design is completed, the method is to count the number of overflow bit with preset load to the input signal phase.)