Several common multiplier Verilog, VHDL code

It is Synopsys dmac controller databook

基于vhdl可用的数字频率计，误差较小，精准度较高。文件中还包含了与arm的通信模块、

说明：  利用FPGA实现对外设按键的控制，例如用户库用按键控制跑马灯的效果(FPGA is used to realize the control of external keys, such as the effect of user database using keys to control the running horse lamp)

FPGA设计频率计全套资料，我希望对大家啊好似有用的-FPGA design of a full set of frequency data, I hope all of you ah like useful

设计一个8位有符号数字平方器。平方器将接收操作数B，一个8位有符号数。新兴市场；

这本书主要描述了如何使用system Verilog 建立测试平台和行为级模型(This book will describe how to use the system Verilog test bench and the establishment of behavioral models)

Learning Verilog Chinese Version Part 2

用FPGA实现OFDM系统，硬件语言为Verilog，环境为xilinx，详细介绍了接收机和发射机各个模块的源代码(OFDM system with a FPGA implementation, hardware language Verilog, environment xilinx, details of receiver and transmitter modules source code)

4dbpsk系统的设计实现源码，几个朋友用一个假期的时间协作完成，功能非常好-The 4dbpsk system design realization source code, several friends complete it cooperation in one vacation time , the function is extremely good

设计一简易数字频率计，其基本要求是： 1)测量频率范围0～999999Hz； 2)最大读数999999HZ,闸门信号的采样时间为1s；. 3)被测信号可以是正弦波、三角波和方波； 4)显示方式为6位十进制数显示； 5）具有超过量程报警功能。 5)输入信号最大幅值可扩展。 6）测量误差小于+-0.1%。 7)完成全部设计后，可使用EWB进行仿真，检测试验设计电路的正确性。(The basic requirements of designing a simple digital frequency meter are: 1) The measuring frequency range is 0-999999 Hz. 2) The maximum reading is 999999HZ, and the sampling time of gate signal is 1 s. 3) The measured signal can be sine wave, triangle wave and square wave. 4) The display mode is 6-bit decimal number display. 5) It has alarm function beyond range. 5) The maximum amplitude of input signal can be expanded. 6) The measurement error is less than +0.1%. 7) After completing all the design, EWB can be used to simulate and test the correctness of the circuit.)