开源软核处理器OpenRisc的SOPC设计

8位加减器，八位减法器与加法器，用过一个控制端可以自由变换，采用移位加法方式，用途广泛，利用减法位补码加法的理论实现。(8 addition and subtraction, eight subtractor and adder, used a control terminal can freely change the using Shift addition, a wide range of uses, the use of subtraction complement addition theory to achieve.)

在数字通信中，通常直接从接收到的数字信号中提取位同步信号，这种直接法按其提取同步信号的方式，大致可分为滤波法和锁相法。锁相法是指利用锁相环来提取位同步信号的方法，本设计方案就是基于锁相环的位同步提取方法，能够比较快速地提取位同步时钟，并且设计简单，方便修改参数。采用Quartus II设计软件对系统进行了仿真试验，并用Altera的Cyclone II系列FPGA芯片Ep2c5予以实现。(In digital communication, usually from receiving directly in digital signal extracted a synchronized signal, the direct method according to the extraction synchronized signal way, can be roughly divided into filtering method and phase lock method. Phase lock method is using of phase locked loop to extract a synchronized signal method, the design scheme is based on phase locked loop of a synchronous extraction method and can be quickly extract a synchronous clock, and design simple, convenient modification parameter. The Quartus II design software of the system, and the simulation test Altera Cyclone II FPGA chip to achieve Ep2c5 series.)

控制AD采样的程序,希望对大家能有所帮助!不对之处请多多指导!-I think it is a goog pragram ,I hope it is good for you !

说明：  基于FPGA的信号发生器，产生了正弦波，方波，锯齿波和三角波四种波形，按下一次按钮，波形切换一次。按下另一个按钮，改变波形的频率(The signal generator based on FPGA can generate four kinds of waveforms: sine wave, square wave, sawtooth wave and triangle wave. Press the button once and switch the waveform once. Press another button to change the frequency of the waveform)

流水线LMS，和RLS算法的Verilog代码，用于自适应信号处理的FPGA实现。(The Verilog code about fir_pipline_lms and fir_rls. They commonly used in adaptive signal processing in FPGA platform.)

很好的fft学习程序感兴趣的同学可以看哈，下载一下。(it is very good )

周立功Fusion StartKit，fpga开发板的实验例程，Flash Memory初始化RAM实验(ZLG Fusion StartKit, fpga development board test routines Flash Memory Initialize RAM experiments)

relative cpu design implementation

这个文档回答了很多关于AHB总线在使用上经常遇到的问题(this doc gives a lot of answers for using AHB bus when doing design)

COUNTER 用于xilinx硬件，里面已建工程，修改ucf即可。设计由3部分组成，计数器，100M分配时钟，顶层模块，其中顶层模块包括计数器和分频器。