Embedded gateway based ARM and FPGA Zhang ying Lin xiaokang (The Department of Electronic Engineering ,Tsinghua University, Beijing, China 100084) Abstract: This article describes basic functions and working principle of the gateway in application-specific digital network, then gives the way to realize the gateway in hardware and software design. This gateway uses ARM mpu and FPGA to realize the functions such as protocol translation、processing of OSPF packets,etc. Keywords: embedded system gateway OSPF protocol