一种基于NAND Flash的实时嵌入式系统的多级冗余机制的设计  

Design of Multi-level Redundancy Mechanism of Real-time Embedded System Based on NAND Flash

作　　者：宋凯林 龚定宇 SONG Kai-lin;GONG Ding-yu(College of Electrical And Information Engineering,Hunan Institute of Engineering,Xiangtan 411104,China)

机构地区：[1]湖南工程学院电气与信息工程学院,湘潭411104

出　　处：《湖南工程学院学报（自然科学版）》2021年第3期26-32,共7页Journal of Hunan Institute of Engineering(Natural Science Edition)

基　　金：国家自然科学基金资助项目(61841103);湖南省自然科学基金资助项目(2019JJ50106);湖南省教育厅科研资助项目(19C0480).

摘　　要：设备平台采用NAND Flash作为系统存储设备时,也意味着NAND本身所固有的位反转缺陷会给系统稳定性带来不确定因素.为解决上述问题,本文提出了一种全新的系统软件架构,通过对关键系统核心组成部分进行多级冗余备份,在不影响系统本身性能要求前提下,减轻甚至消除NAND带来的位反转效应。最后,采用故障树分析(FTA)方法对新架构进行建模仿真,并与传统架构对比分析,实验结果表明采用新的软件系统架构能有效地提高平台的可靠性.When the device platform adopts NAND Flash as the system storage device,it also means that the inherent bit inversion defect of NAND will bring uncertain factors to system stability.In order to solve the problem,this paper proposes a new system software architecture.By performing multi-level redundant back-up on the core components of key systems,the bit reversal effect brought by NAND can be alleviated or even eliminated without affecting the performance requirements of the system itself.Finally,the fault tree analysis(FTA)model is used to simulate the new architecture and compared with the traditional architecture.The ex-perimental results show that the new software system architecture can effectively improve the reliability of the platform.

关 键 词：NAND Flash 位反转 系统稳定性 冗余备份 故障树分析 

分 类 号：TP316.2[自动化与计算机技术—计算机软件与理论]