公开(公告)号：US09552171B2

公开(公告)日：2017-01-24

申请号：US14526870

申请日：2014-10-29

Applicant: SanDisk Technologies LLC

Inventor： Yichao Huang ,  Chris Avila ,  Dana Lee ,  Henry Chin ,  Deepanshu Dutta ,  Sarath Puthenthermadam ,  Deepak Raghu

IPC: G06F12/00 ,  G06F3/06 ,  G06F12/02 ,  G11C16/04 ,  G11C16/34

CPC classification number: G06F3/0647 ,  G06F3/0608 ,  G06F3/0679 ,  G06F12/0223 ,  G06F2212/7205 ,  G11C16/0483 ,  G11C16/3431 ,  G11C16/349 ,  G11C16/3495 ,  G11C2211/5644 ,  G11C2211/5648

Abstract: 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.

Abstract translation: 提出了一些使用自适应计数器管理的读取擦除过程的免费技术。 在一组技术中，除了维持块的累积读计数器之外，还可以维持边界字行计数器以跟踪部分写入块的最近写入的字线或字线的读数。 使用的另一组技术读取计数阈值随着块所经历的编程/擦除周期数而变化。 进一步的技术涉及基于在关闭之前经历的数字读取来设置关闭（完全写入）块的读取计数阈值。 这些技术也可以应用于子区块级别。