UART是一种广泛应用于短距离、低速、低成本通信的串行传输接口.由于常用UART芯片比较复杂且移植性差,提出一种采用可编程器件FPGA实现UART的方法, 实现了对UART的模块化设计.首先简要介绍UART的基本特点,然后依据其系统组成设计顶层模块,再采用有限状态机设计接收器模块和发送器模块,所有功能的实现全部采用VHDL进行描述,并用Modelsim软件对所有模块仿真实现.最后将UART的核心功能集成到FPGA上,使整体设计紧凑,小巧,实现的UART功能稳定、可靠. -UART is a widely used short-range, low-speed, low-cost serial transmission interface communication. Because of the complexity of common UART chip and poor transplant, using a programmable FPGA devices to achieve UART way of the realization of the UART modular design. First of all, a brief introduction of the basic characteristics of UART, and then according to their top-level module system design, and then the design of finite state machine receiver module and transmitter module, the realization of all the features to describe the use of VHDL and Modelsim software used Simulation of all modules. Finally, the UART core functionality into the FPGA, so that the overall design of compact, compact, the UART function of the realization of stable and reliable.