The Manchester dataflow computer is a famous dynamic dataflow computer.It is centralized in architecture and simple in organization. Its overhead for communication and scheduling is very small. Its efficiency comes do...The Manchester dataflow computer is a famous dynamic dataflow computer.It is centralized in architecture and simple in organization. Its overhead for communication and scheduling is very small. Its efficiency comes down, when processing elements in the processing subsystem increaJse. Several articles eval uated its performance and presented improved methods. The authors studied its processing subsystem and carried out the simulation. The simulation rer sults show that the efficiency of the processing subsystem drops dramatically when average instruction execution microcycles become less and the maximum instruction execution rate is nearly attained. Two improved methods are pre-sented to overcome the disadvantage. The improved processing subsystem with a cheap distributor made up of a bus and a twthlevel fixed priority circuit pos-sesses almost full efficiency no matter whether the average instruction execution microcycles number is large or small and even if the mtalmum instruction execution rate is approached.展开更多
The Main Optical Telescope (MOT) is an important payload of the Space Solar Telescope (SST) with various instruments and observation modes. Its real-time data handling and management and control tasks are arduous. Bas...The Main Optical Telescope (MOT) is an important payload of the Space Solar Telescope (SST) with various instruments and observation modes. Its real-time data handling and management and control tasks are arduous. Based on the advanced techniques of foreign countries, an improved structure of onboard data handling systems feasible for SST, is proposed. This article concentrated on the development of a Central Management & Control Unit (MCU) based on FPGA and DSP. Through reconfigurating the FPGA and DSP programs, the prototype could perform different tasks. Thus the inheritability of the whole system is improved. The completed dual-channel prototype proves that the system meets all requirements of the MOT. Its high reliability and safety features also meet the requirements under harsh conditions such as mine detection.展开更多
文摘The Manchester dataflow computer is a famous dynamic dataflow computer.It is centralized in architecture and simple in organization. Its overhead for communication and scheduling is very small. Its efficiency comes down, when processing elements in the processing subsystem increaJse. Several articles eval uated its performance and presented improved methods. The authors studied its processing subsystem and carried out the simulation. The simulation rer sults show that the efficiency of the processing subsystem drops dramatically when average instruction execution microcycles become less and the maximum instruction execution rate is nearly attained. Two improved methods are pre-sented to overcome the disadvantage. The improved processing subsystem with a cheap distributor made up of a bus and a twthlevel fixed priority circuit pos-sesses almost full efficiency no matter whether the average instruction execution microcycles number is large or small and even if the mtalmum instruction execution rate is approached.
基金Project 863-2.5.2.25 supported by the National High Technology Research & Development (863) Program of China
文摘The Main Optical Telescope (MOT) is an important payload of the Space Solar Telescope (SST) with various instruments and observation modes. Its real-time data handling and management and control tasks are arduous. Based on the advanced techniques of foreign countries, an improved structure of onboard data handling systems feasible for SST, is proposed. This article concentrated on the development of a Central Management & Control Unit (MCU) based on FPGA and DSP. Through reconfigurating the FPGA and DSP programs, the prototype could perform different tasks. Thus the inheritability of the whole system is improved. The completed dual-channel prototype proves that the system meets all requirements of the MOT. Its high reliability and safety features also meet the requirements under harsh conditions such as mine detection.
