commonly used verilog skills

用VHDL实现60秒倒计时的功能 倒计时为0时蜂鸣器持续响起(Continued sounded to achieve 60 seconds of the countdown function with VHDL countdown to the 0:00 buzzer)

fpga的一个小程序用于3s500e 4*4键盘模块(fpga is a small program used 3s500e 4* 4 keyboard module)

说明：  这是8位CPU的CVDL代码。CPU 的主要功能是执行指令，控制完成计算机的各项操作，包括运算操作、传送操作、输入/输出操作等。作为模型计算机设计，将重点放在寄存器级，采取较简单的组成模式，以尽量简洁的设计帮助学生掌握CPU 的基本原理。 此次设计CPU就是为了了解CPU运行的原理，从而完成从指令系统到CPU的设计，并且通过仿真对CPU设计进行正确性评定。(The main function of CPU is to execute instructions, control and complete various operations of computer, including operation, transfer operation, input / output operation, etc. As a model computer design, it focuses on register level and adopts a simpler composition mode to help students master the basic principles of CPU with a concise design as far as possible. This design of CPU is to understand the principle of CPU operation, so as to complete the design from instruction system to CPU, and evaluate the correctness of CPU design through simulation.)

一个简易数字钟程序，可以实现24小时精确计时、整点报时、时钟矫正、时钟复位等功能

说明：  用verilog编写的LVDS接口驱动程序，采用IOSERDES技术实现，经过Spartan6 FPGA调试验证，有完整的工程。(The LVDS interface driver written in verilog is implemented using IOSERDES technology. After Spartan6 FPGA debugging and verification, there is a complete project.)

简易双口ram，使用两个ram ip core，一个写的同时另一个读，并且包含按键使能和数码管以及流水灯显示(Simple dual-port ram, two ram the ip core, a write while another read, and contains buttons to enable digital pipe and the water light show)

前导零的计算 (Calculation of leading zeros)

本例程位于 VMD642_CPLD目录中。 使用 CPLD 实现辅助译码、LED 指示灯控制、看门狗等各种逻辑控制电路。源程序使 用 Verilog HDL书写，编译开发系统使用 Cypress公司的 Warp 6.3。(This routine is located VMD642_CPLD directory. Using CPLD implementation auxiliary decoding, LED indicator control, watchdog, and other logic control circuitry. Written using Verilog HDL source code, the compiler development system using Cypress' s Warp 6.3.)

频移键控FSK的Verilog实现，带测试文件，并在FPGA开发板上成功验证(Frequency Shift Keying FSK the Verilog implementation, with the test file, and successfully verified in FPGA development board)

微分器：利用数字锁相环进行位同步信号提取的关键模块(Differentiator: the use of digital phase-locked loop for bit synchronous signal extraction of key modules)