本代码实现了全加器功能，适合初学者学习

matlab科斯塔斯环的仿真，有波形，很实用的程序(matlab costas m programm)

relative cpu design implementation

说明：  对MAX5250芯片进行控制，实现DA转换输出。(Controlling MAX5250 Chip)

带有异步清零、异步置位功能的边沿JK触发器(With asynchronous reset, asynchronous setting function of edge JK flip-flop)

实现FPGA接收429板卡发送的信号，并根据数据最后两位点亮相应的LED。(FPGA to achieve the 429 board to receive the signal sent, and according to the data of the last two of the corresponding LED.)

verilog语言设计的VGA驱动。在Quarus11.0下编译成功，并在Altera cyclone4开发板上测试OK(verilog language design VGA driver. In Quartus11.0 successfully compiled and Altera cyclone4 development board test OK)

本程序实现不同频率时钟的产生及其相互转化-this program different clock frequencies to the formation and transformation

说明：  直接数字式频率合成器DDS设计、Verilog。 产生的信号可以是正弦波或方波、三角波、锯齿波等，自选。 采用DDS技术，将所需生成的波形写入ROM中，按照相位累加原理合成任意波形。 此方案得到的波形稳定，精度高，产生波形频率范围大，容易产生高频。 本实验在设计的模块中，包含以下功能： （1）通过 freq 信号输入需要的频率的值； （2）通过 wave_sel 信号选择所需的波形； （3）通过 amp_adj 信号选择波形放大的倍数。(DDS design of direct digital frequency synthesizer, Verilog. The generated signal can be sinusoidal or square wave, triangular wave, sawtooth wave and so on, optional. By using DDS technology, the required waveforms are written into ROM, and arbitrary waveforms are synthesized according to the principle of phase accumulation. The waveform obtained by this scheme is stable, accurate and easy to generate high frequency waveform. This experiment includes the following functions in the designed module: (1) Input the required frequency value through freq signal; (2) Choosing the required waveform by wave_sel signal; (3) Select the multiplier of waveform amplification by amp_adj signal.)

说明：  掌握SDRAM数据读写、刷新、初始化以及FPGA串口收发时序，熟练FIFO IP核的生成和调用。(Master SDRAM data read and write, refresh, initialization and the timing of sending and receiving of the serial port of the FPGA, skilled in the generation and invocation of the FIFO IP core.)