针对星载FPGA配置数据的高可靠存储设计

Design of High-reliable storage for Configuration Bitstream of Space-born FPGA

摘要:

为了提高星载SRAM型FPGA在轨应用的可靠性,星载SRAM型FPGA在轨重构系统需要提高FPGA配置数据的存储可靠性。对配置数据存储方法进行了研究,提出了一种“三模+巡检”的复合式存储设计方法及相关系统实施方案。采用Markov模型,结合星上设备在轨运行时出现的永久性错误、暂时性错误以及修复率的影响,对“三模+巡检”的复合式存储设计进行可靠度分析,给出了系统可靠度微分方程组。通过Matlab仿真分析了永久性错误率、修复率等因素对可靠度的影响。经过仿真分析,“三模+巡检”的复合式存储系统在轨可靠度大于0.99, 进一步证明其可靠性明显优于传统三模冗余的存储方式,满足在轨可靠性要求。

Abstract:

In order to meet the high-reliable requirement of configuration bitstream of SRAM-FPGA in system of on-orbit reconfiguration, a design and implementation of storage system mixed with 3-module redundancy and loop-check is proposed. The reliability of mixed storage system is derived in detail by Markov model, considering influences of permanent error and temporal error in the space-born equipments on orbit and of maintenance rate. The differential equitation group is presented as the solution of reliability of the system. With simulation in Matlab, the influenced of permanent error and maintenance rate on the reliability of the system are analyzed. The reliability of mixed storage design achieves 0.99 on orbit, which further proves that the proposed design is obviously superior to the traditional 3-module redundancy system.