Research And Design Of Small Scale Satellite Borne Solid State Memory

Space experimental data,from early satellite telemetry and remote control information to high definition pictures of various load cameras,have gradually become the main output of space missions.Satellite-borne solid-state memory can store,process and download the key information collected by satellite data transmission subsystem.It is an important component of space data transmission subsystem.In a sense,the performance of satellite-borne solid-state memory determines the quality of the whole space mission.NAND-type FLASH is widely used as a storage medium in the market today.It has the characteristics of fast read-write speed,high reliability and no loss of power-off.It has become the mainstream design idea to store the external input payload in solid-state memory by NAND-type FLASH in the aerospace field.In this thesis,the bus parallel extension of NAND-type FLASH is adopted.This method can effectively improve the read-out and write speed of solid-state memory.In this thesis,control technology is used to write and read out external data efficiently and efficiently.This method saves CPU resources to a great extent,and makes the CPU complete the scheduling,switching and bad block management and maintenance of FLASH.With the cooperation of controller and CPU,SSM can feedback more real-time information while recording and replaying,and users can operate SSM more flexibly in the process of using.The traditional solid-state memory has the characteristics of high data throughput and large storage capacity.It is mostly used in large-scale scientific research satellites.Nowadays,more and more micro-experimental satellites are launched.The demand for solid-state memory has changed from high storage capacity,fast record and playback rate to multi-interface and flexible operation.The solid-state memory designed in this thesis is connected with a number of external load devices.For the requirement of multi-load writing into the effective data of the solid-state memory at the same time,a method of classifying and caching different types of loads by using embedded RAM in FPGA is proposed,and different types of loads are identified internally.The frame solves the shortcomings of the traditional fixed interface and the zero processing of internal data.The research results of this paper lay a foundation for the development of space-borne embedded solid-state memory based on flash memory media,and have a good reference significance.