这是一个也介绍GPIB编程的文章以及介绍GPIB协议规范

NCO的VHDL程序，是利用IP核生成的，超好的，快下吧-NCO of the VHDL process is the use of nuclear-generated IP, super good, fast, are you

基于FPGA器件的DDS设计实现中的一个核心部分就是波形存储表的设计。首先采用LPM_ROM和 VHDL选择语句这两种方法进行波形存储表的设计和比较分析 然后考虑到硬件资源的有限性及DDS的精度要 求,对这两种方法的程序进行了优化 最后对这两种方法设计的程序进行仿真和硬件调试。结果表明:采用这两种 方法都能有效地实现DDS中波形存储表的设计。 (DDS-based FPGA devices designed to achieve one of the core of the waveform is stored in table design. First of all, choose to adopt LPM_ROM and VHDL statements of these two methods for the design waveform storage tables and comparative analysis and then, taking into account the limited hardware resources and the accuracy of DDS, the two methods to optimize the process the last of these two methods of process design simulation and hardware debugging. The results showed that: the use of these two methods are all effective ways to achieve the DDS waveform stored in the table design.)

1）选择一个语音信号作为分析对象，或录制一段语音信号； 2）对语音信号进行采样，画出采样前后语音信号的时域波形和频谱图； 3）利用MATLAB中的随机函数产生噪声加入到语音信号中，使语音信号被污染，然后进行频谱分析； 4）设计用于处理该语音信号的数字滤波器，给出滤波器的性能指标，画出滤波器的频率响应； 5）对被噪声污染的语音信号进行滤波，画出滤波前后信号的时域波形和频谱，并对滤波前后的信号进行比较和分析； 6）回放各步骤的语音信号，给出相应处理程序及运行结果分析。(1) Select a voice signal as an analysis object, or record a voice signal 2) sampling the voice signal, draw the waveform and frequency spectrum of the time domain before and after sampling the speech signal 3) using the random function in MATLAB generated noise was added to the speech signal, the speech signal to be contaminated, and then spectrum analysis 4) for processing the speech signal, the digital filter design, given the performance of the filter to draw the filter' s frequency response 5) on the noise pollution of the speech signal is filtered, time-domain waveform and spectrum draw before and after filtering the signal before and after filtering, and the signal for comparison and analysis 6) playback of the speech signal for each step, given the results of the corresponding processing procedures and run analysis.)

自己写的一个tcd1209d的时序驱动代码，是用verilog语言编写的，可以借鉴(Of write a tcd1209d of timing-driven code, Verilog language, can learn from)

良好的Coding Style能减少Bug，减少锁存器出现的可能以及其他隐藏逻辑错误，也有助于减小芯片面积或所用资源(Good Coding Style can reduce Bug, reduce the possibility of latches and other hidden logic errors, and also help to reduce chip area or resources used.)

基于FPGA的快速傅里叶变换。使用ISE软件以及MATLAB验证。(FFT based on FPGA)

在ISE下，FPGA产生线性调频信号，并且产生信号的参数可调(In ISE, the FPGA generates a linear frequency modulation signal, and the parameters of the signal are adjustable.)

频率计，测量频率。可测范围为100HZ至60khz.测量比较稳定。基于MSPg2553(Frequency meter, measuring frequency. Measurable range 100HZ to 60khz. Stable measurement)

用VHDL语言设计多功能的电子表。实现基本电子表的时间显示、闹钟、秒表等功能(VHDL language design with multi-functional electronic watch. The time table to achieve basic electronic display, alarm clock, stopwatch functions)

说明：  交通灯的控制，分主干道和从路交通灯，主路优先，正常情况下，绿灯60s，红灯30S，黄灯5S(Traffic light control)