verilog HDL编写的出租车计费系统

一个简易的频率计，主要用检测在一定范围内的频率，当然频率过大会有误差(A simple frequency meter, mainly used for testing in a range of frequencies, of course, frequency of errors over the General Assembly)

VHDL实现的读取和写入SDRAM的程序代码，学习的人可以参考下-VHDL implementation SDRAM read and write program code, can refer to the following study

与IP核配套的I2C-Master Core，包含了目前主流FPGA芯片的I2C实现，代码包括Altera/Xilinx/OpenCore等公司的VHDL/Verilog/C等。(I2C-Master Core)

说明：  fpga的RS485代码,非常容易，适合学习(the code of rs485 in fpga, very easy,suitable for learning)

This code that genetes a square, sawtooth and a triangular waveform. It is useful for designing a function generator in VHDL.

SRIO接口物理层的实现代码，非常复杂，完全自己用verilog编写，支持5G速率，可以作为开发参考(SRIO interface implementation code, the physical is very complex, completely written in verilog, support rate of 5 g, will be helpful to the development)

一个比较经典的用VHDL实现的FIFO论文-Instance, the birthday of power wilt lift stamp cavity using VHDL wife of mother

NiosII_Exercises_Ver3,this niosII 3.o for cyclone

使用Verilog编写的24位定时器，具有apb 总线接口，可以设置工作方式和计数初值。(The 24-bit timer written by Verilog has APB bus interface, which can set working mode and count initial value.)

基于FPGA的DDS相位累加器，连接至存有波形数据的rom后再接至DA可以输出对应的波形(abcdefghijklmnopqrstuvwxyz)