以太网物理隔离控制器的设计与实现

The Design and Realization of Physical Isolation Controller

以太网物理隔离系统由物理隔离控制器和用户终端组成.物理隔离控制器基于MCF5271设计,含用户身份识别和用户网络切换两个主要功能,可通过FPGA芯片控制8片KS8995,支持8个通道的物理隔离.由于采用嵌入式以太网技术,该设计具有无附加网络干扰和支持三层网络控制等优点,可作为物理隔离技术的实验研究平台.测试表明:物理隔离控制器能够与用户终端稳定的交互信息,并实现网络切换的功能.

The Ethernet physical isolation system consists of the physical isolation controller and the user＇s terminal, Based on MCF5271, the physical isolation controller is designed which can switch between the networks according to the user＇s identity. MCF5271 can control eight pieces of KS8995 through FPGA and support eight-channel physical isolator, The design can be used as a researching platform because it has the advantages of no additive interference and supporting layer-3 network control after use of embedded Ethernet technology. The testing results show that the isolator can communicate with the user terminals steadily and switch between the networks.