空间图像存储器NAND Flash的可靠性

李进; 金龙旭; 韩双丽; 李国宁; 王文华

doi:10.3788/OPE.20122005.1090

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空间图像存储器NAND Flash的可靠性

信息科学 | 更新时间：2020-08-12

- 空间图像存储器NAND Flash的可靠性
- Reliability of space image recorder based on NAND flash memory
- 光学精密工程 2012年20卷第5期页码：1090-1101
- 作者机构：
  
  1. 中国科学院长春光学精密机械与物理研究所,吉林长春,中国,130033
  2. 中国科学院研究生院北京,100039
- 作者简介：
- 基金信息：
  
  国家863高技术研究发展计划资助项目(No.863-2-5-1-13B)()
- DOI：10.3788/OPE.20122005.1090
  中图分类号： TP391;TP333.5
- 收稿日期：2011-10-18，
  
  修回日期：2011-11-18，
  
  网络出版日期：2012-05-10，
  
  纸质出版日期：2012-05-10
- 稿件说明：
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李进, 金龙旭, 韩双丽, 李国宁, 王文华. 空间图像存储器NAND Flash的可靠性[J]. 光学精密工程, 2012,20(5): 1090-1101

LI Jin, JIN Long-xu, HAN Shuang-li, LI Guo-ning, WANG Wen-hua. Reliability of space image recorder based on NAND flash memory[J]. Editorial Office of Optics and Precision Engineering, 2012,20(5): 1090-1101
李进, 金龙旭, 韩双丽, 李国宁, 王文华. 空间图像存储器NAND Flash的可靠性[J]. 光学精密工程, 2012,20(5): 1090-1101 DOI： 10.3788/OPE.20122005.1090.

LI Jin, JIN Long-xu, HAN Shuang-li, LI Guo-ning, WANG Wen-hua. Reliability of space image recorder based on NAND flash memory[J]. Editorial Office of Optics and Precision Engineering, 2012,20(5): 1090-1101 DOI： 10.3788/OPE.20122005.1090.

摘要

针对空间相机中的图像存储器NAND Flash由于坏块和单粒子翻转导致存储数据不可靠的问题

研究了Flash坏块的管理策略和纠错算法。分析了Flash结构和工作特点

提出了基于并行双遍历机制的坏块管理策略

阐述了双遍历机制的设计思想并分析了它的有效性。在分析Flash结构和纠错特点的基础上

提出了在域GF(2

)上的缩短码RS(246

240)+RS(134

128)纠错算法

并说明了编解码算法思想和实现电路。最后

在一空间多光谱相机样机的图像存储设备上进行了试验验证。结果表明

管理策略能快速可靠地处理坏块事件

每次操作仅需1个系统时钟周期即可完成坏块判断。纠错算法在2 KB/page内可以纠正27 B错误

编码速度达到72.53 MBps

解码器速度达到54.26 MBps。提出的管理策略和纠错算法有效地解决了Flash数据存储的不可靠问题。

Abstract

For the unreliable data storage problem caused by bad blocks and single event upsets for the NAND flash memory in a space camera

this paper explores a bad block management strategy and an error correction algorithm. Firstly

the bad block management strategy based on parallel double-traverse mechanism was proposed by analyzing the characteristics of structure and operation for the NAND flash memory

the design ideas of the double traverse mechanism were described and its effectiveness was analyzed. Then

the error correction algorithm based on the shortened code RS (246

240) and RS (134

128) in the field GF (2

) was proposed

and the encode/decode algorithm and corresponding circuits were given. Finally

the verification experiments on an image storage platform in the prototype machine for a space multi-spectral camera were carried out. The experimental results show that the bad block management strategy can fast and reliably dispose the bad block events

and the algorithm can identify the bad blocks in one system clock period. The error correction algorithm can correct 27 B error within the 2 KB/page with a encoder speed of 72.53 MBps and a decoder speed of 54.26 MBps. Proposed stratege effectively solve the problem of unreliable recording data in the NAND flash memory.

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references

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