发明名称 |
NATURAL THRESHOLD VOLTAGE DISTRIBUTION COMPACTION IN NON-VOLATILE MEMORY |
摘要 |
<p>In a non-volatile memory system, a programming speed-based slow down measure such as a raised bit line is applied to the faster-programming storage elements. A multi-phase programming operation which uses a back-and-forth word line order is performed in which programming speed data is stored in latches in one programming phase and read from the latches for use in a subsequent programming phase of a given word line. The faster and slower-programming storage elements can be distinguished by detecting when a number of storage elements reach a specified verify level, counting an additional number of program pulses which is set based on a natural threshold voltage distribution of the storage elements, and subsequently performing a read operation that separates the faster and slower programming storage elements. A drain-side select gate voltage can be adjusted in different programming phases to accommodate different bit line bias levels.</p> |
申请公布号 |
EP2601654(B1) |
申请公布日期 |
2015.05.20 |
申请号 |
EP20110749995 |
申请日期 |
2011.08.02 |
申请人 |
SANDISK TECHNOLOGIES INC. |
发明人 |
DUTTA, DEEPANSHU;LUTZE, JEFFREY, W. |
分类号 |
G11C11/56;G11C16/04;G11C16/10;G11C16/34 |
主分类号 |
G11C11/56 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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