JP5259481B2 - 不揮発性半導体記憶装置 - Google Patents
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0602—Interfaces specially adapted for storage systems specifically adapted to achieve a particular effect
- G06F3/061—Improving I/O performance
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0602—Interfaces specially adapted for storage systems specifically adapted to achieve a particular effect
- G06F3/0614—Improving the reliability of storage systems
- G06F3/0619—Improving the reliability of storage systems in relation to data integrity, e.g. data losses, bit errors
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0628—Interfaces specially adapted for storage systems making use of a particular technique
- G06F3/0646—Horizontal data movement in storage systems, i.e. moving data in between storage devices or systems
- G06F3/0652—Erasing, e.g. deleting, data cleaning, moving of data to a wastebasket
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0628—Interfaces specially adapted for storage systems making use of a particular technique
- G06F3/0655—Vertical data movement, i.e. input-output transfer; data movement between one or more hosts and one or more storage devices
- G06F3/0656—Data buffering arrangements
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0668—Interfaces specially adapted for storage systems adopting a particular infrastructure
- G06F3/0671—In-line storage system
- G06F3/0673—Single storage device
- G06F3/0679—Non-volatile semiconductor memory device, e.g. flash memory, one time programmable memory [OTP]
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0668—Interfaces specially adapted for storage systems adopting a particular infrastructure
- G06F3/0671—In-line storage system
- G06F3/0683—Plurality of storage devices
- G06F3/0688—Non-volatile semiconductor memory arrays
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- 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
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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
- G11C16/04—Erasable programmable read-only memories electrically programmable using variable threshold transistors, e.g. FAMOS
- G11C16/0408—Erasable programmable read-only memories electrically programmable using variable threshold transistors, e.g. FAMOS comprising cells containing floating gate transistors
-
- 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
- G11C16/0408—Erasable programmable read-only memories electrically programmable using variable threshold transistors, e.g. FAMOS comprising cells containing floating gate transistors
- G11C16/0441—Erasable programmable read-only memories electrically programmable using variable threshold transistors, e.g. FAMOS comprising cells containing floating gate transistors comprising cells containing multiple floating gate devices, e.g. separate read-and-write FAMOS transistors with connected floating gates
- G11C16/045—Floating gate memory cells with both P and N channel memory transistors, usually sharing a common floating gate
-
- 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
- G11C16/3418—Disturbance prevention or evaluation; Refreshing of disturbed memory data
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- 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
- G11C2211/564—Miscellaneous aspects
- G11C2211/5648—Multilevel memory programming, reading or erasing operations wherein the order or sequence of the operations is relevant
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- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Computer Security & Cryptography (AREA)
- Read Only Memory (AREA)
Description
図1は、本発明の第1の実施形態に係るNAND型フラッシュメモリの構成を示すブロック図である。このNAND型フラッシュメモリは、NANDチップ10及びこのNANDチップ10を制御するコントローラ11を備えて構成されている。
次に、本発明の第2の実施形態におけるデータ書き込み順序について説明する。本実施形態は、第1の実施形態と同様、図4のケース1のデータ割り付けによるフラッシュメモリに関するものであり、ページ<0>については、1回のプログラム段階数、その他のページ<k>(k=2〜85の整数)については、3回のプログラム段階数でデータ書き込みを実行するものである。
次に、本発明の第3の実施形態におけるデータ書き込み順序について説明する。本実施形態は、図4のケース2のデータ割り付けによるフラッシュメモリに関するものであり、ページ<85>に対して1回のプログラム段階数でデータ書き込みを実行し、その他のページ<k>(k=0〜84の整数)に対して3回のプログラム段階数でデータ書き込みを実行するものである。
次に、本発明の第4の実施形態におけるデータ書き込み順序について説明する。本実施形態は、第3の実施形態と同様、図4のケース2のデータ割り付けによるフラッシュメモリに関するものであり、ページ<85>に対して1回のプログラム段階数でデータ書き込みを実行し、その他のページ<k>(k=0〜84の整数)に対して3回のプログラム段階数でデータ書き込みを実行するものである。
次に、本発明の第5の実施形態におけるデータ書き込み順序について説明する。本実施形態は、図4のケース3のデータ割り付けによるフラッシュメモリに関するものであり、ページ<0>及びページ<85>に対して2回のプログラム段階数でデータ書き込みを実行し、その他のページ<k>(k=1〜84の整数)に対して3回のプログラム段階数でデータ書き込みを実行するものである。
次に、本発明の第6の実施形態におけるデータ書き込み順序について説明する。本実施形態は、図4のケース1のデータ割り付けによるフラッシュメモリに関するものであり、ページ<0>に対して1回のプログラム段階数でデータ書き込みを実行し、その他のページ<k>(k=1〜84の整数)に対して2回のプログラム段階数でデータ書き込みを実行するものである。
以上、発明の実施の形態を説明したが、本発明はこれらに限定されるものではなく、発明の趣旨を逸脱しない範囲内において、種々の変更、追加等が可能である。
Claims (4)
- 第1及び第2の選択ゲートトランジスタ、並びに前記第1及び第2の選択ゲートトランジスタ間に設けられ電気的に書き換え可能で実効的なデータを記憶する複数のメモリセルが直列接続されたメモリストリングスからなるセルユニットと、
前記メモリセルにデータの書き込みを行うデータ書き込み手段と
を備え、
前記メモリストリングスの両端の少なくとも一方のメモリセルのプログラム段階数は、他のメモリセルのプログラム段階数よりも少なく、
前記データ書き込み手段は、前記プログラム段階数が前記他のメモリセルよりも少ないメモリセルの第1段階のプログラムを前記他のメモリセルの少なくとも1つに対する第1段階のプログラムよりも後に実行し、
前記メモリストリングは、前記第1の選択ゲートトランジスタに最も近い第1メモリセルから前記第2の選択ゲートトランジスタに最も近い第Nメモリセル(Nは、3以上の整数)までのN個の前記メモリセルを有し、
前記第1メモリセルのプログラム段階数がM 1 (M 1 は、1以上の整数)、その他のメモリセルのプログラム段階数がM 2 (M 2 は、M 1 よりも大きい整数)の場合において、
前記データ書き込み手段は、
前記第1メモリセルに対する第m 1 段階(m 1 は、1〜M 1 の整数)のプログラムを、前記第2メモリセルに対する第m 1 段階のプログラムの実行後に実行し、
前記第nメモリセル(nは、3〜Nの整数)に対する第m 2 段階(m 2 は、1〜M 2 の整数)のプログラムを、前記第n−1メモリセルに対する第m 2 段階のプログラムの実行後に実行する
ことを特徴とする不揮発性半導体記憶装置。 - 前記メモリストリングスの両端の少なくとも一方のメモリセルのプログラム段階数と、他のメモリセルのプログラム段階数との差が2以上である
ことを特徴とする請求項1記載の不揮発性半導体記憶装置。 - 前記メモリストリングスの両端のメモリセルは1ビットを記憶し、他のメモリセルは3ビットを記憶する
ことを特徴とする請求項1又は2記載の不揮発性半導体記憶装置。 - 前記セルユニットは、前記第1の選択ゲートトランジスタ及び前記メモリストリングス間並びに前記第2の選択ゲートトランジスタ及び前記メモリストリングス間の少なくとも一方に前記メモリセルと同等の構造を持つダミーセルを有する
ことを特徴とする請求項1〜3のいずれか1項記載の不揮発性半導体記憶装置。
Priority Applications (12)
Application Number | Priority Date | Filing Date | Title |
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JP2009098416A JP5259481B2 (ja) | 2009-04-14 | 2009-04-14 | 不揮発性半導体記憶装置 |
US12/724,636 US8369142B2 (en) | 2009-04-14 | 2010-03-16 | Nonvolatile semiconductor memory device |
US13/711,894 US8605503B2 (en) | 2009-04-14 | 2012-12-12 | Nonvolatile semiconductor memory device |
US14/075,400 US9058877B2 (en) | 2009-04-14 | 2013-11-08 | Nonvolatile semiconductor memory device |
US14/707,908 US9378827B2 (en) | 2009-04-14 | 2015-05-08 | Nonvolatile semiconductor memory device |
US15/166,895 US9612762B2 (en) | 2009-04-14 | 2016-05-27 | Nonvolatile semiconductor memory device |
US15/462,300 US9940031B2 (en) | 2009-04-14 | 2017-03-17 | Nonvolatile semiconductor memory device |
US15/903,629 US10346053B2 (en) | 2009-04-14 | 2018-02-23 | Nonvolatile semiconductor memory device |
US16/431,789 US10579271B2 (en) | 2009-04-14 | 2019-06-05 | Nonvolatile semiconductor memory device |
US16/775,739 US11016670B2 (en) | 2009-04-14 | 2020-01-29 | Nonvolatile semiconductor memory device |
US17/238,822 US11592987B2 (en) | 2009-04-14 | 2021-04-23 | Nonvolatile semiconductor memory device |
US18/101,338 US20230168808A1 (en) | 2009-04-14 | 2023-01-25 | Nonvolatile semiconductor memory device |
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JP2009098416A JP5259481B2 (ja) | 2009-04-14 | 2009-04-14 | 不揮発性半導体記憶装置 |
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JP2010250891A JP2010250891A (ja) | 2010-11-04 |
JP5259481B2 true JP5259481B2 (ja) | 2013-08-07 |
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US20150243358A1 (en) | 2015-08-27 |
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JP2010250891A (ja) | 2010-11-04 |
US10579271B2 (en) | 2020-03-03 |
US11016670B2 (en) | 2021-05-25 |
US20100259980A1 (en) | 2010-10-14 |
US20210240345A1 (en) | 2021-08-05 |
US20230168808A1 (en) | 2023-06-01 |
US20160274809A1 (en) | 2016-09-22 |
US20140063965A1 (en) | 2014-03-06 |
US9058877B2 (en) | 2015-06-16 |
US20130170300A1 (en) | 2013-07-04 |
US10346053B2 (en) | 2019-07-09 |
US9940031B2 (en) | 2018-04-10 |
US8369142B2 (en) | 2013-02-05 |
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