Verilog keyboard input program for led lights display

基于分裂基的蝶型FFT，用C实现，经过测试，没有错误，可以直接拿去使用。(Based on the division of FFT butterfly type, use C implementation, tested, no error, can directly use. )

用VHDL写的源代码程序，包涵三人表决器，七人表决器，全加器以及模24，模60的计数器，都是单文件的，由于程序小又多，所以集中在一起，供新学习VHDL语言的朋友们参考。-With VHDL source code written procedures, includes three of the voting machine, vote on seven people, and full adder, as well as modulus 24, modulus 60 counters, are single-file, as many small procedures, so together for the new Learning VHDL Language Reference friends.

Hynix公司8M Byte SDR SDRAM的Verilog语言仿真实现-Hynix" s 8M Byte SDR SDRAM Simulation of the Verilog language

直接序列扩频通信的Verilog仿真代码，在Quartus II中实现。(Direct sequence spread spectrum communication Verilog simulation code, implemented in Quartus II.)

说明：  本代码是控制DS1302的VHDL代码，浅显易懂，方便修改，注意看data sheet，保证时钟和各个延迟满足要求即可(This code is to control the DS1302' s VHDL code, easy to understand, easy changes, note the data sheet, ensure the clock and can meet the requirements of the various delays)

HDB3码是在AMI码的基础上改进的一种双极性归零码，它除具有AMI码功率谱中无直流分量，可进行差错自检等优点外，还克服了AMI码当信息中出现连“0”码时定时提取困难的缺点，而且HDB3码频谱能量主要集中在基波频率以下，占用频带较窄，是ITU-TG.703推荐的PCM基群、二次群和三次群的数字传输接口码型，因此HDB3码的编解码就显得极为重要。目前，HDB3码主要由专用集成电路及相应匹配的外围中小规模集成芯片来实现，但集成程度不高，特别是位同步提取非常复杂，不易实现。随着可编程器件的发展，这一难题得到了很好地解决。本文利用现代EDA设计方法学和VHDL语言及模块化的设计方法，设计了适合于FPGA实现的HDB3编译码器的硬件实现方案。不但克服了分立硬件电路带来的抗干扰差和不易调整等缺陷，而且具有软件开发周期短，成本低，执行速度高，实时性强，升级方便等特点。

fpga配置锁相环完整程序，使用quartus IP核，Verilog语言。(FPGA configuration PLL complete program, Verilog language.)

说明：  FPGA对系统50M时钟进行分频。FPGA最基本功能基础(FPGA Verilog program, key detection, program jitter elimination, jitter elimination, delay detection keys)

基于FPGA的点灯游戏，完整工程。包括鼠标控制，键盘控制，SVGA显示等(Light game based on FPGA, the whole project which includes keyboard control, SVGA and so on.)

针对兆瓦级风电并网逆变器主电路研制中存在的并联扩容、开关频率较低和LCL滤波器难以优化设计等问题，提出了采用交流侧串接电感再进行并联的均流方案，采用载波移相技术提高变流器的等效开关频率，提出了LCL滤波器的设计原则，并给出了上述设计的理论依据和实现方法。通过对2兆瓦风电变流器主电路的仿真验证了上述技术方案。(MW-class wind power for grid-inverter main circuit of the parallel development of existing capacity, a lower switching frequency and LCL filter design difficult to optimize the problem, a series inductor AC side in parallel are further flow program, the use of carrier phase-shifting technology to enhance the equivalent converter switching frequency, a LCL filter design principles, and gives the above-mentioned theoretical basis for the design and implementation. 2 MW of wind power converter main circuit simulation program to verify the above-mentioned technology.)