A method and apparatus for implementing a two-port Ethernet bridge using a semaphoring technique. The Ethernet bridge includes two MAC devices, a bus, a memory and a semaphoring scheme. The controllers include a first address which is used for indicating receipt of the packet and a second address...http://www.google.se/patents/US5748634?utm_source=gb-gplus-sharePatent US5748634 - Method and apparatus for implementing a two-port ethernet bridge using a semaphoring technique 
