基于NOR FLASH的嵌入式FAT文件系统  

Embedded FAT file system based on NOR FLASH

作　　者：张鹏[1,2] 孙甲松 陈从华[2] 

机构地区：[1]清华大学电子工程系,北京100084 [2]厦门雅迅网络股份有限公司,福建厦门361008

出　　处：《电子设计工程》2017年第23期159-162,168,共5页Electronic Design Engineering

摘　　要：本课题就是要设计一套确实可行的方案,将FAT文件系统管理文件/数据的理念应用于FLASH芯片上。本设计采用了数据块使用情况信息表BIM和定位表MAT这两个结构。通过利用NOR FLASH的特性,在不频繁擦写的情况下记录数据块当前状态和擦写次数,将FAT表和数据块磨损信息实时写入到FLASH存储器中。在此基础上制定合理的均衡损耗策略,并实现坏块管理、碎片回收。适用于内存资源有限、对上电时间有要求、可能随时掉电的终端。令终端能够使用标准接口快速存储、访问大容量数据,并提高FLASH器件使用寿命。The paper is to design a feasible solutions that apply the FAT file system concept applied to nor FLASH chip, using BIM(Block Information Map) and MAT(Map Allocation Table). Base on the characteristics of nor flash,the BIM record the state and erasing times of data block without flashing frequently. The MAT locates all system information table in the FLASH. The FAT table and the block information can be written to the FLASH memory in real time. Base on the plan, the design provides reasonable mechanisms of loss-balance,bad-block-management and garbage-collection. The design is suitable for these devices which have limited memory, harsh time of power up, or astable power. The terminal can use the standard interface to store and access the large capacity data quickly.It improve the service of FLASH.

关 键 词：文件系统 FLASH FAT 嵌入式 

分 类 号：TN302[电子电信—物理电子学]