A Study On Media Oriented Systems Transport Management Based On CAN

Following the rapid development of auto technology and the increasing number of auto electronic equipments, auto integrative electronic control system become more completed and traditional point to point control is far from meeting the demand. Now MCU can solve this problem, which is used in auto electronic control system wildly . In the vehicle between the media interlocks standard MOST (Media Oriented Systems Transport) to be allowed to realize in the vehicle media installment and so on between CD, GPS and TV information sharing.Surveying the current situation of auto network technology, applying the most comprehensive are CAN and SJA1000.CAN, for his good operational use. Great reliability and unique design, is not only adapted to the request of communication of modem auto electronic control units with gradual use in other field, but also regarded one of the CAN TECHD of promise.Analyze information transmission theory mode of auto computer network communication. Each node of MOST NETWORK can only connect two other nodes physically, and transmission mechanism is complicated. In CAN BUS, a mainline connects to computer, with high line utilization ratio. Time-sharing visit mainline, the length of network, the number of net nodes are limited by transmission delay, drive ability and mechanism. CAN BUS is adapted to the situation of short-distance transmission and not many nodes. The most part of auto network adopt this type, especially in low network. Analyze the node structure and equipment structure of MOST. Design AT91RM9200 flush bonding CPU. When choose AT91RM9200 CPU as central part to develop put-in type system, the first problem is to how to start-up system.AT91RM9200 CPU provides several initiate modes, which totally are distributed into the way of external DATAFLASH,two line EEPROM or parallel storage medium leading to start-up and the way of from internal BOOTROM to lead to Start-up.