JP5216856B2 - プログラムの期間中での干渉の影響の低減 - Google Patents
プログラムの期間中での干渉の影響の低減 Download PDFInfo
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- 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
-
- 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
- G11C16/00—Erasable programmable read-only memories
- G11C16/02—Erasable programmable read-only memories electrically programmable
- G11C16/04—Erasable programmable read-only memories electrically programmable using variable threshold transistors, e.g. FAMOS
- G11C16/0483—Erasable programmable read-only memories electrically programmable using variable threshold transistors, e.g. FAMOS comprising cells having several storage transistors connected in series
-
- 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
- G11C16/10—Programming or data input circuits
-
- 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
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C2211/00—Indexing scheme relating to digital stores characterized by the use of particular electric or magnetic storage elements; Storage elements therefor
- G11C2211/56—Indexing scheme relating to G11C11/56 and sub-groups for features not covered by these groups
- G11C2211/562—Multilevel memory programming aspects
- G11C2211/5621—Multilevel programming verification
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Computer Hardware Design (AREA)
- Read Only Memory (AREA)
- Semiconductor Memories (AREA)
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Description
NAND型フラッシュメモリの一例では、メモリセルが消去された後では閾値電圧が負値となり、それは論理「1」と定義される。プログラム後の閾値電圧は正値となり、それは論理「0」と定義される。閾値電圧が負値であり、制御ゲートに0ボルトが印加される読み出しが試みられた場合、メモリセルがオンとなり、これは論理1が記憶されていることを示す。閾値電圧が正値であり、制御ゲートに0ボルトが印加される読み出しが試みられた場合、メモリセルはオンせず、これは論理0が記憶されていることを示す。
を備える。
他のタイプのメモリ素子も使用できる。
Claims (12)
- 複数の不揮発性記憶素子を備える不揮発性記憶装置のプログラム方法であって、
第1の期間において不揮発性記憶素子の第1のグループにプログラムを行うステップと、
第1の期間と異なる第2の期間において不揮発性記憶素子の第2のグループにプログラムを行うステップと、
不揮発性記憶素子の第1のグループおよび不揮発性記憶素子の第2のグループに対して一緒に検証を行うステップと、
を備え、
不揮発性記憶素子の第1のグループは第1のワードラインに接続され、
不揮発性記憶素子の第2のグループは前記第1のワードラインに接続され、
不揮発性記憶素子の第1のグループおよび不揮発性記憶素子の第2のグループに含まれる不揮発性記憶素子の各々は、交互に配列される形態で異なるビットラインに接続されることを特徴とする方法。 - 前記プログラム方法は、プログラムに用いられる電圧の大きさが所定電圧まで到達することに応じて、第1のトリガを発生するステップをさらに備え、
第1の期間において不揮発性記憶素子の第1のグループにプログラムを行うステップおよび第2の期間において不揮発性記憶素子の第2のグループにプログラムを行うステップは、第1のトリガに応じて第1のトリガの後に実行され、
前記プログラム方法は、第1のトリガに先立って1以上のプログラムサイクルを実行するステップをさらに備え、
1以上のプログラムサイクルの各々は、不揮発性記憶素子の第1のグループおよび不揮発性記憶素子の第2のグループに一緒にプログラムを行うステップを有していることを特徴とする請求項1の方法。 - 前記プログラム方法は、不揮発性記憶素子の第1のグループおよび不揮発性記憶素子の第2のグループのいくつの不揮発性記憶素子がまだプログラム中であるか、および、いくつの不揮発性記憶素子がプログラム対象として選択された隣接するメモリセルを有するかを判断するステップをさらに備え、
前記プログラム方法は、不揮発性記憶素子の第1のグループおよび不揮発性記憶素子の第2のグループのいくつの不揮発性記憶素子がまだプログラム中であるか、および、いくつの不揮発性記憶素子がプログラム対象として選択された隣接するメモリセルを有するかに基づいて第2のトリガを検出するステップをさらに備え、
第1の期間において不揮発性記憶素子の第1のグループにプログラムを行うステップおよび第2の期間において不揮発性記憶素子の第2のグループにプログラムを行うステップは、前記第2のトリガに先立って行われ、
前記プログラム方法は、前記第2のトリガに引き続いて1以上の追加のサイクルを実行し、
1以上の追加のサイクルの各々は、不揮発性記憶素子の第1のグループおよび不揮発性記憶素子の第2のグループに一緒にプログラムを行うステップを有していることを特徴とする請求項1または2の方法。 - 前記プログラム方法がさらに備えている、不揮発性記憶素子の第1のグループにプログラムを行うステップは、
不揮発性記憶素子の第1のグループおよび不揮発性記憶素子の第2のグループに第1のプログラムパルスを印加するステップと、
第1のプログラムパルスによって不揮発性記憶素子の第2のグループにプログラムが行われることを禁止するステップと、
第1のプログラムパルスによって不揮発性記憶素子の第1のグループにプログラムが行われることを許可するステップと、を有しており
前記プログラム方法がさらに備えている、不揮発性記憶素子の第2のグループにプログラムを行うステップは、
不揮発性記憶素子の第1のグループおよび不揮発性記憶素子の第2のグループに第2のプログラムパルスを印加するステップと、
第2のプログラムパルスによって不揮発性記憶素子の第1のグループにプログラムが行われることを禁止するステップと、
第2のプログラムパルスによって不揮発性記憶素子の第2のグループにプログラムが行われることを許可するステップと、
を有していることを特徴とする請求項1ないし3の何れか1項の方法。 - 不揮発性記憶素子の第1のグループおよび不揮発性記憶素子の第2のグループの動作中に第1のトリガを動的に調整するステップをさらに備えることを特徴とする請求項2ないし4の何れか1項の方法。
- 不揮発性記憶素子の第1のグループおよび不揮発性記憶素子の第2のグループを含む複数の不揮発性記憶素子と、
不揮発性記憶素子と通信する1以上の管理回路と、
1本のワードラインと、
複数のビットラインと、を備え、
不揮発性記憶素子の第1のグループがワードラインに接続されると共に、不揮発性記憶素子の第2のグループも前記ワードラインに接続され、
不揮発性記憶素子の第1のグループおよび不揮発性記憶素子の第2のグループに含まれる不揮発性記憶素子の各々は、交互に配列される形態で異なるビットラインに接続され、
1以上の管理回路は、不揮発性記憶素子の第2のグループへのプログラムとは別に不揮発性記憶素子の第1のグループにプログラムを行い、
1以上の管理回路は、不揮発性記憶素子の第2のグループの検証と一緒に不揮発性記憶素子の第1のグループの検証を行うことを特徴とする不揮発性記憶装置。 - 1以上の管理回路は、プログラムに用いられる電圧の大きさが所定電圧まで到達することに応じて、第1のトリガを発生し、
1以上の管理回路は、第1のトリガに応じて第1のトリガの後に、不揮発性記憶素子の第2のグループへのプログラムとは別に、不揮発性記憶素子の第1のグループにプログラムを行い、
1以上の管理回路は、第1のトリガの前に、不揮発性記憶素子の第2のグループと一緒に、不揮発性記憶素子の第1のグループにプログラムを行うことを特徴とする請求項6の不揮発性記憶装置。 - 1以上の管理回路は、第1のグループの不揮発性記憶素子と第2のグループの不揮発性記憶素子によって形成される、互いに隣接する不揮発性記憶素子のペアであって、まだプログラム中である前記互いに隣接する不揮発性記憶素子のペアの数を検出し、
1以上の管理回路は、まだプログラム中である前記互いに隣接する不揮発性記憶素子のペアの数が所定のしきい値よりも小さい場合に、第2のトリガを発生し、
1以上の管理回路は、前記第2のトリガの前に、不揮発性記憶素子の第2のグループへのプログラムとは別に、不揮発性記憶素子の第1のグループにプログラムを行い、
1以上の管理回路は、前記第2のトリガに応じて前記第2のトリガの後に、不揮発性記憶素子の第2のグループと一緒に、不揮発性記憶素子の第1のグループにプログラムを行うことを特徴とする請求項6または7の不揮発性記憶装置。 - 第1のトリガは、不揮発性記憶素子の第1のグループおよび不揮発性記憶素子の第2のグループに同時に印加されるプログラムパルスの電圧レベルを有していることを特徴とする請求項6ないし8の何れか1項の不揮発性記憶装置。
- 1以上の管理回路は、
不揮発性記憶素子の第2のグループにプログラムが行われることが禁止されている期間に、不揮発性記憶素子の第1のグループおよび不揮発性記憶素子の第2のグループに第1のプログラムパルスを印加し、
不揮発性記憶素子の第1のグループにプログラムが行われることが禁止されている期間に、不揮発性記憶素子の第1のグループおよび不揮発性記憶素子の第2のグループに第2のプログラムパルスを印加することによって、
不揮発性記憶素子の第2のグループのプログラムとは別に、不揮発性記憶素子の第1のグループにプログラムを行うことを特徴とする請求項6ないし9の何れか1項の不揮発性記憶装置。 - 1以上の管理回路は、第1のトリガを動的に調整することを特徴とする請求項7の不揮発性記憶装置。
- 不揮発性記憶素子の第1のグループおよび不揮発性記憶素子の第2のグループは、フラッシュメモリデバイスであることを特徴とする請求項6ないし11の何れか1項の不揮発性記憶装置。
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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US11/849,992 US7869273B2 (en) | 2007-09-04 | 2007-09-04 | Reducing the impact of interference during programming |
US11/849,992 | 2007-09-04 | ||
PCT/US2008/074621 WO2009032747A1 (en) | 2007-09-04 | 2008-08-28 | Reducing the impact of interference during programming |
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JP2010538409A JP2010538409A (ja) | 2010-12-09 |
JP5216856B2 true JP5216856B2 (ja) | 2013-06-19 |
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US (5) | US7869273B2 (ja) |
EP (1) | EP2181446B1 (ja) |
JP (1) | JP5216856B2 (ja) |
KR (1) | KR101502104B1 (ja) |
CN (1) | CN101849263B (ja) |
TW (1) | TWI391944B (ja) |
WO (1) | WO2009032747A1 (ja) |
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EP2181446A1 (en) | 2010-05-05 |
US8094492B2 (en) | 2012-01-10 |
EP2181446B1 (en) | 2013-06-12 |
US20110075477A1 (en) | 2011-03-31 |
CN101849263A (zh) | 2010-09-29 |
US7869273B2 (en) | 2011-01-11 |
TW200917272A (en) | 2009-04-16 |
EP2181446A4 (en) | 2010-09-22 |
USRE45813E1 (en) | 2015-11-24 |
JP2010538409A (ja) | 2010-12-09 |
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