build a music player with nios 2

Frame Control field
Retry:
Set in case of retransmission frame
More fragments:
Set when frame is followed by other fragment
Power Management
bit set when station go Power Save mode (PS)
More Data:
When set means that AP have more buffered data for a station in Power Save mode

说明：  FPGA 学习实例 动态时钟、面积、速度优化相关代码(Codes related to dynamic clock, area and speed optimization for learning examples of FPGA)

AD0832 AD转换程序，功能完全通过测试，备注非常详细，KEILC编程，通用性强(AD0832 AD converter, fully functional test, notes, very detailed, KEILC programming, versatility)

Simulation and Synthesis Techniques for Asynchronous FIFO Design

利用verilog语言设计实现8路FIR滤波-Using verilog Language Design and Implementation of 8-channel FIR filter

FPGA流水线设计的资料，可以作为学习FPGA开发并行操作的一个经典教材，具有很好的指导作用。(FPGA pipeline design information can be developed as a learning FPGA parallel operation of a classic textbook, has a good guide.)

xilinx的ddr sdram控制器文档-xilinx of ddr sdram controller documentation

说明：  基于fpga的DDS程序 可输出正弦波 方波 三角波 锯齿波(DDS program based on FPGA can output sinusoidal square wave triangular wave sawtooth wave)

小波包分解，重构轴承振动信号，Hilbert包络，FFT进行频谱分析，以获得轴承故障频率。(Wavelet packet decomposition, reconstruction of bearing vibration signal, Hilbert envelope, FFT spectrum analysis to obtain the bearing fault frequencies.)

用NIOSII生成的VGA显示程序,可以在显示器上显示通讯内容