波形产生器：用VHDL编写的波形产生器程序

可以产生正弦波，三角波、锯齿波、方波，要求频率1Hz-100kHz，步进1Hz，具有自动扫频功能； 正弦波的相位可调，方波的占空比可调； (Can generate sine wave, triangle wave, sawtooth wave and square wave, the required frequency of 1 hz- 100 KHZ, step 1 hz, with functions of automatic frequency sweep The phase adjustable sine wave, square wave duty ratio is adjustable )

挂靠在AMBA2.0的AHB总线上的DMA装置，用于直接发起数据传输。(Anchored the DMA devices the AHB bus AMBA2.0, for initiating data transfer.)

说明：  PID算法用verilog语言实现，实测可用，由三个模块组成(The PID algorithm is implemented in Verilog language. The actual measurement is available. It consists of three modules.)

FPGA设计的四种常用思想与技巧分享:串并转换设计技巧、流水线设计思想……(FPGA design of four common ideas and techniques)

Verilog HDL编写的总线功能模型，十分有用，需要的下载-Verilog HDL prepared by the bus functional model is useful, it needs to download

基于altera系列芯片lvds接口的fpga设计 verilog源码-Series altera-based chip interface lvds source fpga design verilog

利用VHDL实现CPLD（EPM240T100C5）的串口接收程序-Using VHDL realize CPLD (EPM240T100C5) the serial receive procedure

讲述4ASK的原理并附有matlab调制解调的源码。。。。。。。。。。 注：原来上传的4ASKmod.zip不要下(The principle tells 4ASK together with modulation and demodulation matlab source. . . . . . . . . . Note: The original upload 4ASKmod.zip not down)

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))

利用dsp builder设计的IIR滤波器，已经验证完全可以使用，只需要把其中系数改变。内含VHDL代码(Design IIR filters by dsp builder have been verified , just change the coffetions including VHDL code.)