fpga under the seven

沃尔什函数发生器工程文件，Quartus Ⅱ 13.0版本(Walsh Function Generator)

VHDL由简单存储器，计数器等搭建最终实现8位的cpu设计(VHDL realization 8 of cpu design)

AUDIO音频模块AN831的录音及播放FPGA代码，测试通过(AUDIO audio module AN831 recording and playback of FPGA code, the test passed)

VGA显示控制：时序控制+像素点的颜色处理显示十字光标（vorilog）(VGA Display Control: Timing Control+ pixel color processing and display cross cursor (vorilog))

FPGA学习的非常好的资料，希望广大朋友都可以学习学习啊(FPGA to learn very good information, I hope our friends can learn ah)

FPGA设计中的60进制计数器，通过2个七段数码管系那是出来。代码简单易懂，仿真通过，而且在FPGA开发板上加载显示成功。很有用的入门代码。

低通滤波器在QUARTUS7.0开发环境下的文本与框图结合的实现方法的源代码-Low-pass filter QUARTUS7.0 development environment in the text and diagram combination of methods to achieve source code

说明：  SDIO 接口，实现SD卡的控制器功能，带有详细的注释(SDIO Interface,to realize the controller of SD Card,and have detail description.)

FPGA实现反正切功能，工程原件，包括测试文件，能够很好实现该功能(FPGA implements arctangent function, original engineering)

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.)