A number of complimentary techniques for the read scrub process using adaptive counter management are presented. In one set of techniques, in addition to maintaining a cumulative read counter for a block, a boundary word line counter can also be maintained to track the number of reads to most recently written word line or word lines of a partially written block. Another set of techniques used read count threshold values that vary with the number of program/erase cycles that a block has undergone. Further techniques involve setting the read count threshold for a closed (fully written) block based upon the number reads it experienced prior to being closed. These techniques can also be applied at a sub-block, zone level.
申请公布号
WO2016069126(A1)
申请公布日期
2016.05.06
申请号
WO2015US50212
申请日期
2015.09.15
申请人
SANDISK TECHNOLOGIES INC.
发明人
HUANG, YICHAO;AVILA, CHRIS NGA YEE;LEE, DANA;CHIN, HENRY;DUTTA, DEEPANSHU;PUTHENTHERMADAM, SARATH;RAGHU, DEEPAK