此程序用通过PFGA用VHDL语言实现了傅立叶变换，希望对大家有用...

文件名：ADC0809.vhd功能：基于VHDL语言，实现对ADC0809简单控制说明：ADC0809没有内部时钟，需外接10KHz~1290Hz的时钟号，这里由FPGA的系统时钟（50MHz）经256分频得到clk1（195KHz）作为ADC0809转换工作时钟。-File name: ADC0809.vhd features: Based on the VHDL language, easy to control implementation of the ADC0809 Description: ADC0809 internal clock does not need external 10KHz ~ 1290Hz clock number, here by the FPGA system clock (50MHz) frequency by 256 points to be clk1 (195KHz ) as the conversion ADC0809 clock job.

本代码介绍了使用VHDL开发FPGA的一般流程，最终采用了一种基于FPGA的数字频率的实现方法。该设计采用硬件描述语言VHDL，在软件开发平台ISE上完成，可以在较高速时钟频率（100MHz）下正常工作。该设计的频率计能准确的测量频率在1Hz到100MHz之间的信号。使用ModelSim仿真软件对VHDL程序做了仿真，并完成了综合布局布线，最终下载到芯片Spartan-II上取得良好测试效果。-the code on the FPGA using VHDL development of the general process, finally adopted a FPGA-based digital frequency method. The design using VHDL hardware description language, the software development platform ISE completed, the higher speed clock frequency (100MHz) under normal work. The design of the frequency meter can be accurately measured in a frequency of 100MHz between Hz signal. Use ModelSim VHDL simulation software to do the simulation process, and completed a comprehensive layout cabling, downloaded to the final chip Spartan-II made good on the test results.

VHDL之二進制轉BCD碼之程式碼，算完整的(Of binary to BCD code VHDL code, operator complete)

说明：  内部含3个模块，使用DDS产生200k与500k的正弦波，两者相加后过数字低通滤波（通带0-200k，阻带400k以上），并将波形输出，实测FFT分析中看不到500k分量。其中数字滤波器采用MATLAB设计（FIR+等波纹，阻带衰减-80dB）(There are three modules in the system. DDS is used to generate 200K and 500K sine waves. After adding the two modules, the digital low-pass filter (passband 0-200k, stopband above 400k) is used, and the waveform is output. 500K component can not be seen in the actual FFT analysis. The digital filter is designed by MATLAB (FIR + equal ripple, stopband attenuation - 80dB))

介绍了基于Altera 公司的CPLD 芯片FL EX10 K,以及利用VHDL 语言实现多位二进 制码转换成8421BCD 码的原理、设计思路和软件实现。-Introduction based on Altera

矩阵求逆模块硬件实现,用verilog语言，基于ISE开发环境(implement of inverse matrix)

LFSR模块，单个模块，实现移位寄存器，生成测试用pattern-LFSR

Quartus? II 相关的语言 详细介绍了VHDL verilog软件开发过程(Quartus ? II related language detailed introduces the verilog VHDL software development process )

quartus工具入门文档，altera公司官方软件翻译全文。-tool for quartus entry documents, altera company official translation of the full text of the software.

VHDL实现 DDS。大家共享吧，一起学习，一起进步(VHDL realize DDS. U.S. to share it with learning, with progress)