JP2016004591A - メモリシステムおよび制御方法 - Google Patents
メモリシステムおよび制御方法 Download PDFInfo
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- JP2016004591A JP2016004591A JP2014123639A JP2014123639A JP2016004591A JP 2016004591 A JP2016004591 A JP 2016004591A JP 2014123639 A JP2014123639 A JP 2014123639A JP 2014123639 A JP2014123639 A JP 2014123639A JP 2016004591 A JP2016004591 A JP 2016004591A
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- Prior art keywords
- data
- cell
- threshold
- memory
- memory cell
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Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C16/00—Erasable programmable read-only memories
- G11C16/02—Erasable programmable read-only memories electrically programmable
- G11C16/06—Auxiliary circuits, e.g. for writing into memory
- G11C16/34—Determination of programming status, e.g. threshold voltage, overprogramming or underprogramming, retention
- G11C16/3418—Disturbance prevention or evaluation; Refreshing of disturbed memory data
- G11C16/3427—Circuits or methods to prevent or reduce disturbance of the state of a memory cell when neighbouring cells are read or written
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C11/00—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor
- G11C11/56—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using storage elements with more than two stable states represented by steps, e.g. of voltage, current, phase, frequency
- G11C11/5621—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using storage elements with more than two stable states represented by steps, e.g. of voltage, current, phase, frequency using charge storage in a floating gate
- G11C11/5628—Programming or writing circuits; Data input circuits
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C11/00—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor
- G11C11/56—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using storage elements with more than two stable states represented by steps, e.g. of voltage, current, phase, frequency
- G11C11/5671—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using storage elements with more than two stable states represented by steps, e.g. of voltage, current, phase, frequency using charge trapping in an insulator
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C16/00—Erasable programmable read-only memories
- G11C16/02—Erasable programmable read-only memories electrically programmable
- G11C16/06—Auxiliary circuits, e.g. for writing into memory
- G11C16/34—Determination of programming status, e.g. threshold voltage, overprogramming or underprogramming, retention
- G11C16/3418—Disturbance prevention or evaluation; Refreshing of disturbed memory data
- G11C16/3431—Circuits or methods to detect disturbed nonvolatile memory cells, e.g. which still read as programmed but with threshold less than the program verify threshold or read as erased but with threshold greater than the erase verify threshold, and to reverse the disturbance via a refreshing programming or erasing step
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C16/00—Erasable programmable read-only memories
- G11C16/02—Erasable programmable read-only memories electrically programmable
- G11C16/06—Auxiliary circuits, e.g. for writing into memory
- G11C16/34—Determination of programming status, e.g. threshold voltage, overprogramming or underprogramming, retention
- G11C16/3436—Arrangements for verifying correct programming or erasure
- G11C16/3454—Arrangements for verifying correct programming or for detecting overprogrammed cells
- G11C16/3459—Circuits or methods to verify correct programming of nonvolatile memory cells
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- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Read Only Memory (AREA)
- Techniques For Improving Reliability Of Storages (AREA)
Abstract
Description
ΔVth2=ΔVth1−Vshift (条件:Vshift≦ΔVth1/2) …(1)
ΔVth2=ΔVshift (条件:Vshift>ΔVth1/2) …(2)
ΔVth2=ΔVth1−Vshift1−Vshift2 …(3)
Claims (8)
- 複数のメモリセルを含むメモリセルアレイを含むメモリチップを備えたメモリシステムであって、
前記メモリセルアレイにおける第1のメモリセルに第1のデータを書き込む第1書込み手段と、
前記第1のメモリセルに近接する第2のメモリセルに前記第1のメモリセルの閾値を調整するための第2のデータを書き込む第2書込み手段と、
を備えるメモリシステム。 - 前記第1のデータを分類する分類手段と、
前記分類手段による前記第1のデータの分類に応じて前記第2のデータを生成する生成部と、
をさらに備える請求項1に記載のメモリシステム。 - 前記第1のデータが書き込まれた前記第1のメモリセルの閾値を検証する検証手段をさらに備え、
前記第2書込み手段は、前記検証手段による検証結果に応じて前記第2のデータの前記第2のメモリセルへの書き込みを調整する
ことを特徴とする請求項1に記載のメモリシステム。 - 前記第1のデータが書き込まれた前記第1のメモリセルの閾値を検証する検証手段と、
前記検証手段による検証結果に基づいて閾値調整が必要な第1のメモリセルを特定する特定手段と、
をさらに備えることを特徴とする請求項1に記載のメモリシステム。 - 前記特定手段は、前記検証手段による検証の結果、第1の値よりも低いまたは高い閾値の第1のメモリセルを前記閾値調整が必要な第1のメモリセルとして特定することを特徴とする請求項4に記載のメモリシステム。
- 前記特定手段は、前記検証手段による検証の結果、第1の値よりも低い閾値の第1のメモリセル、および、前記第1の値よりも高い第2の値よりも高い第1のメモリセルをそれぞれ前記閾値調整が必要な第1のメモリセルとして特定することを特徴とする請求項4に記載のメモリシステム。
- 前記第2のメモリセルは、前記第1のメモリセルが接続されたワードラインに隣接するワードラインに接続されていることを特徴とする請求項1に記載のメモリシステム。
- 複数のメモリセルを含むメモリセルアレイを含むメモリチップを備えたメモリシステムの制御方法であって、
前記メモリセルアレイにおける第1のメモリセルに第1のデータを書き込み、
前記第1のメモリセルに近接する第2のメモリセルに前記第1のメモリセルの閾値を調整するための第2のデータを書き込む
ことを含む制御方法。
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2014123639A JP6282535B2 (ja) | 2014-06-16 | 2014-06-16 | メモリシステムおよび制御方法 |
US14/669,687 US9286995B2 (en) | 2014-06-16 | 2015-03-26 | Memory system and control method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2014123639A JP6282535B2 (ja) | 2014-06-16 | 2014-06-16 | メモリシステムおよび制御方法 |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2016004591A true JP2016004591A (ja) | 2016-01-12 |
JP6282535B2 JP6282535B2 (ja) | 2018-02-21 |
Family
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JP2014123639A Expired - Fee Related JP6282535B2 (ja) | 2014-06-16 | 2014-06-16 | メモリシステムおよび制御方法 |
Country Status (2)
Country | Link |
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US (1) | US9286995B2 (ja) |
JP (1) | JP6282535B2 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2017523547A (ja) * | 2014-06-25 | 2017-08-17 | インテル コーポレイション | クロスポイントメモリにおけるヒータとしての熱擾乱 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005129194A (ja) * | 2003-10-20 | 2005-05-19 | Sandisk Corp | 不揮発性メモリの振舞いに基づくプログラミング |
JP2008130182A (ja) * | 2006-11-22 | 2008-06-05 | Sharp Corp | 不揮発性半導体記憶装置 |
JP2011198419A (ja) * | 2010-03-19 | 2011-10-06 | Toshiba Corp | 不揮発性半導体記憶装置およびその書き込み方法 |
JP2012069193A (ja) * | 2010-09-22 | 2012-04-05 | Toshiba Corp | 不揮発性半導体記憶装置およびその制御方法 |
JP2015170368A (ja) * | 2014-03-04 | 2015-09-28 | 株式会社東芝 | 演算制御装置、それを備えたメモリシステム、情報処理装置、および、演算制御方法 |
Family Cites Families (8)
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DE10103060B4 (de) * | 2000-01-26 | 2006-06-08 | Infineon Technologies Ag | Verfahren zum Testen einer ein Floating-Gate aufweisenden Speicherzelle und Anordnung zur Durchführung dieses Verfahrens |
JP4005000B2 (ja) | 2003-07-04 | 2007-11-07 | 株式会社東芝 | 半導体記憶装置及びデータ書き込み方法。 |
US7936599B2 (en) * | 2007-06-15 | 2011-05-03 | Micron Technology, Inc. | Coarse and fine programming in a solid state memory |
JP2010009733A (ja) * | 2008-06-30 | 2010-01-14 | Toshiba Corp | 不揮発性半導体記憶装置 |
JP5212143B2 (ja) | 2009-01-29 | 2013-06-19 | 株式会社デンソー | 車両用計器 |
US8294488B1 (en) * | 2009-04-24 | 2012-10-23 | Adesto Technologies Corporation | Programmable impedance element circuits and methods |
US9030870B2 (en) * | 2011-08-26 | 2015-05-12 | Micron Technology, Inc. | Threshold voltage compensation in a multilevel memory |
KR101855169B1 (ko) * | 2011-10-13 | 2018-05-09 | 삼성전자주식회사 | 불휘발성 메모리 장치, 불휘발성 메모리 장치의 프로그램 방법, 불휘발성 메모리 장치를 포함하는 메모리 시스템 |
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2014
- 2014-06-16 JP JP2014123639A patent/JP6282535B2/ja not_active Expired - Fee Related
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2015
- 2015-03-26 US US14/669,687 patent/US9286995B2/en not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005129194A (ja) * | 2003-10-20 | 2005-05-19 | Sandisk Corp | 不揮発性メモリの振舞いに基づくプログラミング |
JP2008130182A (ja) * | 2006-11-22 | 2008-06-05 | Sharp Corp | 不揮発性半導体記憶装置 |
JP2011198419A (ja) * | 2010-03-19 | 2011-10-06 | Toshiba Corp | 不揮発性半導体記憶装置およびその書き込み方法 |
JP2012069193A (ja) * | 2010-09-22 | 2012-04-05 | Toshiba Corp | 不揮発性半導体記憶装置およびその制御方法 |
JP2015170368A (ja) * | 2014-03-04 | 2015-09-28 | 株式会社東芝 | 演算制御装置、それを備えたメモリシステム、情報処理装置、および、演算制御方法 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2017523547A (ja) * | 2014-06-25 | 2017-08-17 | インテル コーポレイション | クロスポイントメモリにおけるヒータとしての熱擾乱 |
Also Published As
Publication number | Publication date |
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US9286995B2 (en) | 2016-03-15 |
JP6282535B2 (ja) | 2018-02-21 |
US20150364206A1 (en) | 2015-12-17 |
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