在自动配置协议广泛流传开来之前，人们有时会手工配置计算机系统，以改用全双工操作，但另一台计算机依然会使用半双工操作。

Before the autonegotiation protocol was widely used, people would sometimes manually configure one system to use full duplex, but the other would use half duplex.

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本文介绍了利用VHDL语言设计出全双工异步接收发送器电路的方法，并通过计算机仿真和实验证明了设计的正确性。

In this paper, the design of full duplex UART base on VHDL is thoroughly discussed. And the exactitude of this design has been proved by means of computer simulation and experiment.

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