Invention Grant
- Patent Title: Method and system for programming multi-state memory
- Patent Title (中): 多状态存储器编程方法和系统
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Application No.: US13410499Application Date: 2012-03-02
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Publication No.: US08644068B1Publication Date: 2014-02-04
- Inventor: Xueshi Yang , Zining Wu
- Applicant: Xueshi Yang , Zining Wu
- Applicant Address: BM Hamilton
- Assignee: Marvell International Ltd.
- Current Assignee: Marvell International Ltd.
- Current Assignee Address: BM Hamilton
- Main IPC: G11C11/34
- IPC: G11C11/34

Abstract:
In a multi-level memory cell, when data to be programmed arrives, the cell is programmed to the lowest-charge state in which any bit position that is being programmed or has already been programmed has the correct value, regardless of the value in that state of any bit position that has not yet been programmed and is not being programmed. The programming of other bit positions based on subsequently arriving data should not then require a transition to an impermissible lower energy state. Although this may result in a transient condition in which some bits have the wrong value, by the time programming is complete, all bits would be expected to have the correct value. A cell may contain any number of bits equal to or greater than two, and programming may be performed cyclically (e.g., from LSB to MSB), anticyclically (e.g., from MSB to LSB), or in any random order.
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