VHDL编写的4个led灯循环明暗变化，通过改变波形占空比实现，课堂作业自编程序...

可实现两个4bit补码的加法及减法，有溢出提示(adder with overflow hint)

如上图所示， Rst是低电平有效的系统复位信号，Clk是时钟信号。AB[5：0]是地址信号，DB[7：0]是数据信号，wr是低电平有效的写信号。start是启动信号。 模块中有一个64x8的双端口的存储器。系统复位结束后，可以通过AB、DB和wr信号向同步存储器写入数据。当写入64个数据后，给出一个Clk周期宽度的脉冲信号start，则系统从存储器0地址处开始读出数据，读出的8位数据从低位开始以3位为一组，每个时钟周期输出一组，即第一个时钟周期输出[2：0]位，第二个时钟周期输出[5：3]位，第三个周期输出1地址的[0]位和0地址的[7：6]位，直至将存储器中64x8数据全部输出。若最后一组不足三位，则高位补0。 (As shown above, Rst is an active-low system reset signal, Clk is a clock signal. AB [5: 0] is the address signal, DB [7: 0] is the data signal, wr write signal is active low. start is the start signal. Module in a dual port memory of 64x8. After the reset, you can write data to the synchronous memory by AB, DB and wr signals. When data is written to 64, given the width of a pulse signal Clk cycle start, the system begins to read the memory address 0, 8 data read out a low starting with three as a group, each clock outputs a set period, which is the first clock cycle of the output [2: 0] bits, the second clock cycle output [5: 3] position, the third cycle of the output of an address [0] and 0 address [7 : 6] bit, until all the data in memory 64x8 output. If the last group of less than three, the high 0s.)

说明：  完成对cdcm6208的时钟芯片的配置，输出高频时钟(cdcm6208 cofigure using SPI interface)

数字频率计的设计，显示0~999的频率 整个程序代码都是通过vhdl语言来完善的 功能模块多样，详细的介绍了多模块的各个功能

ADC7606的驱动代码，采用verilog实现(ADC7606 driver code, using Verilog to achieve)

VESA CVT视频参数计算器，输入分辨率和刷新率即可得到需要参数。(VGA Timing Calculator)

SPI经典ip核 可以直接用于工程的开发和利用-err

niosII的ip核的实现原理讲解，讲解的非常详细。(niosII ip nuclear realization of the principle of explanation, to explain in great detail.)

通过总结当前对处理器架构的安全性能的处理方法，提出一种增强DSP处理器安全性能的方法。主要从并行性方面进行了改进。最后对改进的方法进行了仿真和结果分析。(By summing up the current security architecture of the processor performance approach, a DSP processor to enhance the safety performance of the method. Mainly from the aspects of parallelism to improve. Finally, improved methods and results of simulation analysis.)

实现了lcd1602显示的功能，可以在lcd上显示“年”字，有利于初学者学习lcd在fpga上显示，采用文本编辑的，利用quartus ii 702-Achieved lcd1602 display function, you can lcd display " " The word will help beginners learn lcd display in the fpga, using a text editor, using quartus ii 702