dct idct 编码

来自于NIOSII的那些事，该书详细地介绍了NIOSS的使用过程，非常适合初学者。(From the NIOSII those things, the book are detailed in this paper NIOSS use process, very suitable for beginners. )

：随机脉宽调制是解决交流调速系统 中声学噪声的直接有效方法。随机零矢 量分 布是一种很好 的随 机方法，但其不对称的开关函数使其不适用于传统的电流采样方法。通过仿真表明 PWM周期中点采样的方 法无法得到准确的平均值，在分析不对称模式引起的纹波电流对电流平均值影响的基础上，提出了一种适合 于 RZV分布 的电流采样方法 。仿真结果证实该方法简单可行 。 -: Random pulse width modulation speed control system to solve the exchange of acoustic noise in a direct and effective way. Random zero vector distribution is a good random method, but the asymmetrical switching function so that it does not apply to the traditional current sampling methods. PWM cycle through the simulation shows that the mid-point sampling methods can not be an accurate, on average, the analysis of asymmetric mode ripple current caused by the impact on the current average value based on the proposed distribution of a suitable RZV current sampling methods. The simulation results confirmed that the method is simple and feasible.

使用两个8点FFT完成64-point FFT(64-point FFT)

说明：  用VERILOG语言实现的频谱分析仪（FFT)(VERILOG language with the Spectrum Analyzer (FFT))

Quartus II软件设计数字电子钟，使用verilog语言编写各个 模块生成symbol files，再用原理图方式制作顶层文件。 完成的功能有：能够显示时、分、秒；具有清零，调节分钟的功能； 具有整点报时功能，声响电路发出叫声； (failed to translate)

verilog vga 图像处理(verilog vga)

说明：  4位数码扫描显示电路,我们控制一个七段LED需要8个输出端口；如果要输出四位十进制数，就需要32的输出端口，这将占用大量的端口资源。采用串行扫描显示，我们只需要8+4共12个端口即可。其原理是：用一个四位的输出端控制，某一时刻只选中其中的一个LED（输出为‘1’表示选中），八位的输出端将该LED所需要显示的值输出；然后四位的输出端值改变，选中下一个LED。这样依次类推。如果选择的频率很快，达到50Hz以上，由于人眼的视觉暂留效应，看起来就像4个LED同时显示。 设计一个程序，输入四个一位十进制数，用4个LED显示出来。CLK采用频率可调信号发生器，逐渐改变频率，观察扫描频率的改变对输出效果的影响。 输入：连续脉冲，逻辑开关；输出：七段LED。 (4 digital scanning display circuit, we need to control a seven-segment LED output port 8 If you want to output four decimal numbers, you need the output port 32, which will take up a lot of ports. Serial scans showed, we need only 8 of 12 ports can be+4. The principle is: the output of four with a control, a time to select only one LED (output 1 is selected), 8 output of the LED by the need to show the value of the output then The output value of the four changes, select the next LED. This and so on. If you select the frequency rapidly, reaching more than 50Hz, as the human eye s persistence of vision effect, looks like a 4 LED display simultaneously. Design a program, enter a decimal number four, with four LED display. CLK signal generator with adjustable frequency, gradually changing the frequency of observed changes in scan frequency effect on the output. Input: Continuous pulse, logic switches output: seven-segment LED.)

说明：  一种能简单的实现I2C通讯的代码，对于主机和从机之间的通讯讲解的很清楚。(A Code for I2C Communication)

通信系统中数据的传输以帧为单位，在FPGA中帧头检测是通信系统中的一部分，该程序实现了FPGA中帧头的检测。(Transmission of data in a communication system in units of frames, the frame header is detected in the FPGA part of the communication system, the realization of the frame header is detected in the FPGA.)

verilog program for real time clock.. select the .v file to view the code.