频率除以 3 计数器

verilog代码实现的数字密码锁。通过4个并行的10位移位寄存器，分别记录在时钟上升沿时A,B,C,D的输入情况，比如某上升沿输入A，相应时刻A对应的移位寄存器输入1，其他三个移位寄存器输入都为0.另外4个并行的10位寄存器记录密码。这样，密码锁不仅可以识别字符数量，还可以判断出字符的输入次序。(verilog code of digital lock. By four parallel 10-bit shift register, respectively, recorded in the clock rising edge A, B, C, D of inputs, such as a rising edge of input A, the corresponding moments A 1 corresponding to the input shift register, the other three shift bit register inputs are 0. another four parallel 10-bit registers record the password. This lock can not only identify the number of characters, you can also determine the character of the input sequence.)

VHDL operators basics

卷积码(2,1,7)编码器，一个输入，两个输出(Convolution code (2,1,7) encoder, an input and two outputs)

ISE环境下Verilog编程实现机械按键去抖(ISE Verilog programming environment under mechanical debounces)

关于FPGA排序算法的研究文献，有全排序和一些归并算法的文献介绍。(FPGA sequencing algorithm on the literature, there are some sort of sorting algorithm and the literature on the merger.)

图像线性插值Verilog代码，已通过FPGA验证(Image linear interpolation Verilog code, has been verified by FPGA)

加法器，输入两个整数，用电路图形式将其逻辑原理呈现出来，该加法器为8位运算，每一位都对应一张电路图，可展示其完整过程(Adder, input two integer, with circuit diagram form its logical principle appear, this adder is 8 bit arithmetic, each corresponding to a circuit diagram, can show the complete process)

说明：  本文研究的IIC总线控制器具有如下特征 1.兼容飞利浦I2C标准，以主机模式与外围设备进行数据通信，对IIC从机模型进行读/读，读/写，写/写，写/读[18]。 2.多主操作 3.软件可编程时钟频率 4.时钟拉伸和等待状态生成 5.软件可编程确认位 6.时钟同步设计 7.仲裁中断丢失，自动转移取消 8.开始/停止/重复启动检测/确认生成 9.总线忙检测(The IIC bus controller studied in this paper has the following characteristics. 1. Compatible with Philips I2C standard, data communication between host mode and peripheral devices, read/read, read/write, write/write, write/read for IIC slave model [18]. 2. Multiple Main Operations 3. Software programmable clock frequency 4. Clock stretching and waiting state generation 5. Software Programmable Confirmation Bit 6. Clock Synchronization Design 7. Loss of arbitration interruption and cancellation of automatic transfer 8. Start/Stop/Repeat Start Detection/Verification Generation 9. Bus busy detection)

说明：  rgmii代码编写，实现rgmii接口功能，可进行参考设计(The rgmii code is written to realize the function of rgmii interface, which can be used for reference design)

本文件是用Verilog编写的多周期CPU的源码，文件里面含有CPU的连线图，用modesim编写，并且在Quartus II 下仿真通过，本代码将对初学者有很大的参考价值，欢迎大家下载！