US Patent No: 7,688,638
Number of patents in Portfolio can not be more than 2000
Faster programming of multi-level non-volatile storage through reduced verify operations
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Mar 30, 2010
Issued date -
Dec 7, 2007
filing date -
11/952,295
serial no -
In Force
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Abstract
Programming speed for multi-level non-volatile storage elements is increased by reducing the number of verify operations. In one approach, verify operations are initially performed for the highest state less frequently than for other, lower states based on a recognition that a wider threshold voltage distribution for the highest state can be tolerated. After a number of additional programming pulses are applied, the frequency with which the verify operations are performed for the highest state increases. For example, for a four-level device in which state C is the highest state, C-state verify operations can be started when a first B-state element has been programmed and an additional number of program pulses have been applied. The C-state verify operations can be performed after every other program pulse until a certain number of C-state elements have been fully programmed, after which the C-state verify operations can be performed after every program pulse.
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First Claim
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International Classification(s)
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Cited Art
| Patent Info | (Count) | # Cites | Year |
|---|---|---|---|
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| 6,222,762 Multi-state memory | 678 | 1997 | |
| 6,738,289 Non-volatile memory with improved programming and method therefor | 108 | 2001 | |
| 7,196,931 Non-volatile memory and method with reduced source line bias errors | 53 | 2002 | |
| 6,859,397 Source side self boosting technique for non-volatile memory | 223 | 2003 | |
| 7,237,074 Tracking cells for a memory system | 82 | 2003 | |
| 6,917,542 Detecting over programmed memory | 40 | 2003 | |
| 7,023,736 Non-volatile memory and method with improved sensing | 103 | 2003 | |
| 7,120,051 Pipelined programming of non-volatile memories using early data | 72 | 2004 | |
| 7,046,568 Memory sensing circuit and method for low voltage operation | 126 | 2004 | |
| 7,196,928 Compensating for coupling during read operations of non-volatile memory | 158 | 2005 | |
| 7,224,614 Methods for improved program-verify operations in non-volatile memories | 35 | 2005 | |
| 7,254,071 Flash memory devices with trimmed analog voltages | 19 | 2006 | |
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| 5,570,315 Multi-state EEPROM having write-verify control circuit | 617 | 1994 | |
| 5,774,397 Non-volatile semiconductor memory device and method of programming a non-volatile memory cell to a predetermined state | 434 | 1996 | |
| 6,046,935 Semiconductor device and memory system | 592 | 1999 | |
| 6,643,188 Non-volatile semiconductor memory device adapted to store a multi-valued data in a single memory cell | 223 | 2002 | |
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| 5,768,191 Methods of programming multi-state integrated circuit memory devices | 102 | 1996 | |
| 7,054,193 Non-uniform programming pulse width for writing of multi-bit-per-cell memories | 60 | 2004 | |
| 7,054,199 Multi level flash memory device and program method | 45 | 2004 | |
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| 6,937,521 Programming and erasing methods for a non-volatile memory cell | 21 | 2002 | |
| 2007/0177,428 Memory circuit arrangement and method for reading and/or verifying the status of memory cells of a memory cell array | 3 | 2006 | |
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| 2006/0140,007 Non-volatile memory and method with shared processing for an aggregate of read/write circuits | 151 | 2004 | |
| 7,173,859 Faster programming of higher level states in multi-level cell flash memory | 79 | 2005 | |
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| 6,343,033 Variable pulse width memory programming | 61 | 2000 | |
| 7,009,887 Method of determining voltage compensation for flash memory devices | 4 | 2004 | |
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| 6,433,714 Apparatus and method for precision trimming of a semiconductor device | 9 | 2000 | |
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| 6,714,448 Method of programming a multi-level memory device | 22 | 2002 | |
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| 7,085,341 Counter with non-uniform digit base | 8 | 2003 | |
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| 6,366,496 Method for programming multi-level non-volatile memories by controlling the gate voltage | 67 | 2000 | |
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