发明授权
- 专利标题: Methods and apparatus for soft demapping and intercell interference mitigation in flash memories
- 专利标题(中): 闪存中的软解映射和小区间干扰减轻的方法和装置
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申请号: US13001317申请日: 2009-06-30
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公开(公告)号: US08788923B2公开(公告)日: 2014-07-22
- 发明人: Erich F. Haratsch , Milos Ivkovic , Victor Krachkovsky , Nenad Miladinovic , Andrei Vityaev , Johnson Yen
- 申请人: Erich F. Haratsch , Milos Ivkovic , Victor Krachkovsky , Nenad Miladinovic , Andrei Vityaev , Johnson Yen
- 申请人地址: US CA San Jose
- 专利权人: LSI Corporation
- 当前专利权人: LSI Corporation
- 当前专利权人地址: US CA San Jose
- 代理机构: Ryan, Mason & Lewis, LLP
- 国际申请: PCT/US2009/049333 WO 20090630
- 国际公布: WO2010/002948 WO 20100107
- 主分类号: G06F11/00
- IPC分类号: G06F11/00 ; H03M13/00 ; G11C16/34 ; G11C5/00 ; G06F11/10
摘要:
Methods and apparatus are provided for soft demapping and intercell interference mitigation in flash memories. In one variation, a target cell in a flash memory device capable of storing at least two data levels, s, per cell is read by obtaining a measured read value, r, for at least one target cell in the flash memory; obtaining a value, h, representing data stored for at least one aggressor cell in the flash memory; selecting one or more probability density functions based on a pattern of values stored in at least a portion of the flash memory, wherein the probability density functions comprises pattern-dependent disturbance of one or more aggressor cells on the at least one target cell in the flash memory; evaluating at least one selected probability density function based on the measured read value, r; and computing one or more log likelihood ratios based on a result of the evaluating step.