公开(公告)号：US20150143194A1

公开(公告)日：2015-05-21

申请号：US14607039

申请日：2015-01-27

申请人： HGST Netherlands B.V.

发明人： Majid NEMATI ANARAKI ,  Xinde Hu ,  Richard D. Barndt

IPC分类号： H03M13/11

CPC分类号： H03M13/458 ,  H03M13/05 ,  H03M13/1105 ,  H03M13/1111 ,  H03M13/1122 ,  H03M13/1128 ,  H03M13/114 ,  H03M13/1162 ,  H03M13/1171 ,  H03M13/255 ,  H03M13/615 ,  H03M13/6505

摘要： Decoding logic is provided that is operational upon a data buffer to represent a plurality of variable nodes and a plurality of check nodes. For a respective one of the variable nodes, a vector component is selected from a confidence vector associated with the variable node. Using a respective one of the check nodes, a check node return value is calculated based on one or more other vector components from one or more other vectors and one or more vector indices corresponding to the one or more other vector components. The confidence vector is then updated based on the check node return value and an index for the check node return value, and a current state of a memory cell associated with the respective one of the variable nodes is determined based on a location of a primary one of multiple vector components within the updated confidence vector.

摘要翻译： 提供了在数据缓冲器上可操作以表示多个可变节点和多个校验节点的解码逻辑。 对于相应的一个变量节点，从与变量节点相关联的置信向量中选择向量分量。 使用校验节点中的相应一个，基于来自一个或多个其他向量的一个或多个其他向量分量和对应于一个或多个其它向量分量的一个或多个向量索引来计算校验节点返回值。 然后基于校验节点返回值和校验节点返回值的索引来更新置信向量，并且基于主要位置的位置确定与相应一个变量节点相关联的存储器单元的当前状态 在更新的置信向量内的多个向量分量。

公开(公告)号：US09305640B2

公开(公告)日：2016-04-05

申请号：US14724770

申请日：2015-05-28

申请人： HGST Netherlands B.V.

发明人： Xinde Hu

IPC分类号： G11C16/04 ,  G11C11/56 ,  G11C16/26

CPC分类号： G11C11/5642 ,  G11C16/26

摘要： Disclosed is a system and method for reading flash memory cells with dynamically adjusted probability values (e.g., log-likelihood ratios). In connection with reading bit values from flash memory cells, one or more predetermined first probability values are adjusted relative to one or more predetermined second probability values. The one or more predetermined first probability values are associated with reading one or more memory cells programmed to a first binary value, and the one or more predetermined second probability values are associated with reading one or more memory cells programmed to a second binary value. The plurality of bit values read from the plurality of non-volatile memory cells and the one or more adjusted first probability values are provided to a decoder for use in decoding the plurality of bit values.

摘要翻译： 公开了一种用动态调整的概率值（例如对数似然比）来读取闪存单元的系统和方法。 关于从闪存单元读取位值，相对于一个或多个预定的第二概率值来调整一个或多个预定的第一概率值。 一个或多个预定的第一概率值与读取被编程为第一二进制值的一个或多个存储器单元相关联，并且一个或多个预定的第二概率值与读取被编程为第二二进制值的一个或多个存储器单元相关联。 将从多个非易失性存储单元读取的多个位值和一个或多个经调整的第一概率值提供给解码器，以用于解码多个位值。

公开(公告)号：US09047984B2

公开(公告)日：2015-06-02

申请号：US14500904

申请日：2014-09-29

申请人： HGST NETHERLANDS B.V.

发明人： Xinde Hu

IPC分类号： G11C16/04 ,  G11C11/56

CPC分类号： G11C11/5642 ,  G11C16/26

摘要： Disclosed is a system and method for reading a flash memory cell with an adjusted read level. A current read level is set to a new read level associated with increasing a first error rate to decrease a second error rate. The first error rate is associated with determining that the most significant bit of the flash memory cell is a binary 1 and the second error rate is associated with determining that the most significant bit is a binary 0. On reading the memory cell, a probability value is generated for the most significant bit, the probability being higher if the bit is equivalent to a binary 0 than if the bit is equivalent to a binary 1.

摘要翻译： 公开了一种用于读取具有调整读取电平的闪存单元的系统和方法。 将当前读取级别设置为与增加第一错误率相关联以减少第二错误率的新的读取级别。 第一错误率与确定闪速存储器单元的最高有效位是二进制1并且第二错误率与确定最高有效位是二进制0相关联。在读取存储器单元时，概率值 对于最高有效位产生，如果该位等于二进制0，则该概率高于如果该位等效于二进制1。