基于区域地址映射的NAND Flash静态磨损均衡算法  

Static Wear Leveling Algorithm for NAND Flash Memory Based on Region Address Mapping

作　　者：王冬[1] 杨琼[1] 徐晓光[1] 

机构地区：[1]中航工业西安航空计算技术研究所,陕西西安710068

出　　处：《航空计算技术》2015年第2期122-125,共4页Aeronautical Computing Technique

基　　金：工信部民用飞机专项科研项目(MJ-S-2012-05)

摘　　要：在区域地址映射机制基础上,提出了一种延长NAND flash有效使用寿命的静态磨损均衡算法。算法以区域为单位进行冷热数据迁移,使用区域的平均擦除次数和部分平均擦除次数度量区域磨损程度,选取磨损程度最小区域的块与系统预留块进行冷热数据交换。算法将擦除次数上限与当前最大擦除次数的差值作为动态阈值的基数,以减少磨损均衡的开销,保证NAND flash的平均读写性能。通过测试,证明算法能够有效提高flash存储器的磨损均衡效果。This paper proposes a static wear leveling algorithm for nand flash memory based on region address mapping. This algorithm uses the region to migrate data between cold and hot,then uses average and partial region erase count to measure region wear degree,then chooses the block belongs to the minimum wear degree region and the system reserved block to migrate cold- hot data. To reduce the spend of wear leveling and guarantee the speed of read and write,this algorithm uses the difference between limit erase count and current maximum erase count to calculate dynamic threshold,Finally according to test result,it proves that this algorithm can effectively improve the effect of wear leveling.

关 键 词：区域地址映射 静态磨损均衡 区域磨损程度 动态阈值 

分 类 号：TP333[自动化与计算机技术—计算机系统结构]