Study On Key Technology Of SpaceWire For ChipSat

With the development of the microelectronics,micro-electromechanical and integrated circuit technology,satellite miniaturization trend continues to accelerate,small satellites has become the main driving force and important development areas to the world's high-speed development of space activities.In recent years,foreign countries has done a large number of innovative concepts and cutting-edge technology research with the base of small satellite,especially the "Chip Sat" project of US is a typical representative."Chip Sat" promotes micro-system technology in the application of space from the component level to the whole star,accelerating the trend of ultra-miniature spacecraft.Space integrated electronic system is not only the core of the entire satellite,but also the important part of chip satellite engineering design.At the same time,the spatial data network is the main channel for the reliable and real-time transmission,the role of the whole system is equally important.Space Wire is a set of high-speed,serial,full-duplex data network standard launched by European research institutions jointly,has been successful applications in a number of space missionsBased on the full investigation,this paper expounds the development status of Space Wire bus at home and abroad,especially introduces the development of Space Wire related chip.And then the paper discusses the characteristics and working mechanism of Space Wire basic protocol and RMAP protocol.The research direction and main work content of this paper has been cleared.First of all,according to the characteristics of Space Wire network and the practical problems in chip application.According to Space Wire network communication Mathematical modeling,the paper derives a set of key communication node calculation method and cache allocation algorithm.This algorithm makes it possible to realize the routing of each routing node in the network.Cache capacity for optimal configuration..Secondly,by discussing the working characteristics of data flow in Space Wire and mass storage mechanism,this paper proposes a Space Wire transport layer protocol standard which is dedicated to mass storage.It simplifies the cumbersome packet operation process,reduces the possibility of network congestion,and improves the performance of the entire Space Wire network.Then,through the previous research and the practical application of data transmission needs,this paper proposes a Space Wire data network system,focusing the design of the Space Wire load terminal and management terminal.Finally,through the previous chapters of the research,analysis,design and verification,this paper completes the design of the Space Wire bus controller in the "Loongson" processor chip.The Space Wire protocol node and router design is implemented in a limited chip resource space.Each node supports up to 400 Mbps data stream processing;the entire controller achieves a separate control and management of each node,improves the entire Space Wire controller in the use of the flexibility.The key technology of Space Wire bus for Chip Sat is studied and analyzed in the paper.Space Wire has a high transmission rate,high reliability,versatility,networked,which meets the needs of high-speed bus in Chip Sat and the future of space.The study of Space Wire network layer and transport layer provides an effective solution for bus delay control.The Space Wire controller designed in the Loongson has taken an important step.The work of this topic has strong practical significance,and it is of great importance to the future research of Space Wire technology.