JP4812739B2 - 不揮発性データ保存装置の静的データ領域の検出方法、磨耗度平準化方法及びデータユニットの併合方法とその装置 - Google Patents
不揮発性データ保存装置の静的データ領域の検出方法、磨耗度平準化方法及びデータユニットの併合方法とその装置 Download PDFInfo
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F12/00—Accessing, addressing or allocating within memory systems or architectures
-
- 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
- G11C16/349—Arrangements for evaluating degradation, retention or wearout, e.g. by counting erase cycles
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F12/00—Accessing, addressing or allocating within memory systems or architectures
- G06F12/02—Addressing or allocation; Relocation
- G06F12/0223—User address space allocation, e.g. contiguous or non contiguous base addressing
- G06F12/023—Free address space management
- G06F12/0238—Memory management in non-volatile memory, e.g. resistive RAM or ferroelectric memory
- G06F12/0246—Memory management in non-volatile memory, e.g. resistive RAM or ferroelectric memory in block erasable memory, e.g. flash memory
-
- 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
- G11C16/349—Arrangements for evaluating degradation, retention or wearout, e.g. by counting erase cycles
- G11C16/3495—Circuits or methods to detect or delay wearout of nonvolatile EPROM or EEPROM memory devices, e.g. by counting numbers of erase or reprogram cycles, by using multiple memory areas serially or cyclically
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2212/00—Indexing scheme relating to accessing, addressing or allocation within memory systems or architectures
- G06F2212/10—Providing a specific technical effect
- G06F2212/1032—Reliability improvement, data loss prevention, degraded operation etc
- G06F2212/1036—Life time enhancement
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2212/00—Indexing scheme relating to accessing, addressing or allocation within memory systems or architectures
- G06F2212/72—Details relating to flash memory management
- G06F2212/7211—Wear leveling
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- Techniques For Improving Reliability Of Storages (AREA)
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Description
したがって、優先順位が高いほど、コストよりは利得の比率が高いブロックであるので、これを併合演算の対象ブロックと選定する。前記C1ないしC3は、システムの目的によって、設計者が任意に選択でき、実験によって最高性能を表す値と定めることもある。
1310,1410,1510 エイジ記録部
1320,1420,1520 エイジ判読部
1330 静的データ判断部
1400 磨耗度平準化装置
1430 静的データ検出部
1440 データユニット変換部
1500 データユニット併合装置
1530 併合対象探索部
1540 併合部
Claims (13)
- 不揮発性データ保存装置について消去単位であるデータユニットのうち長期間更新あるいは消去されていない静的データが記録されたデータユニットである静的データ領域の検出方法において、
データを記録するために割当てられるデータユニットに記録時間を表すエイジ値を保存するステップと、
前記データユニットに保存されたエイジ値を判読するステップと、
前記判読されたエイジ値を通じて静的データ領域を判断するステップと、を含み、
前記エイジ値は、前記データ及び他のデータ間での記録される時点の先後を相対的に表す値であり、
前記エイジ値は、前記不揮発性データ保存装置に少なくとも一つ以上存在するエイジカウンタによって記録され、
前記保存されるエイジ値は、前記エイジ値と共に保存されるデータを記録する時の前記エイジカウンタ値であり、
前記エイジカウンタの値は、データが記録されていないデータユニットであるフリーユニットが割当てられる度に値が変更されることを特徴とする検出方法。 - 前記エイジ値を保存するステップは、前記データユニットの余裕空間に前記エイジ値を保存することを特徴とする請求項1に記載の検出方法。
- 前記エイジカウンタの値は、前記割当てられるフリーユニットに対するマッピングテーブルの余裕空間に記録され、前記マッピングテーブルが更新される時に共に保存されることを特徴とする請求項1に記載の検出方法。
- 前記保存されたエイジ値を判読するステップは、前記不揮発性データ保存装置を駆動するシステムの遊休時間に行われることを特徴とする請求項1に記載の検出方法。
- 前記保存されたエイジ値を判読するステップは、前記データが割当てられた全ての前記データユニットに対して順次に行われることを特徴とする請求項4に記載の検出方法。
- 前記判読されたエイジ値を通じて静的データ領域を判断するステップは、前記判読されたエイジ値とエイジカウンタ値との差が所定の臨界値より大きい場合、前記判読されたエイジ値を有するデータユニットを静的データ領域と判断することを特徴とする請求項5に記載の検出方法。
- 前記判断された静的データ領域のデータを他のデータユニットに移動することによって磨耗度平準化するステップをさらに含むことを特徴とする請求項1に記載の検出方法。
- 前記判読されたエイジ値を通じて静的データ領域を判断するステップは、前記判読されたエイジ値と前記エイジカウンタの値とを比較するステップをさらに含み、
前記判読されたエイジ値とエイジカウンタ値との比較の結果、差値が所定の臨界値より大きい場合、前記判読されたエイジ値を有するデータユニットを静的データ領域として検出することを特徴とする請求項1に記載の検出方法。 - 前記判断された静的データ領域のデータを他のデータユニットに移動するステップは、前記静的データ領域のデータが記録されたデータユニットを、他のデータが記録されているデータユニットと交換することを特徴とする請求項7に記載の検出方法。
- 不揮発性データ保存装置について消去単位であるデータユニットのうち長期間更新あるいは消去されていない静的データが記録されたデータユニットである静的データ領域を検出する装置において、
データを記録するために割当てられるデータユニットに記録時間を表すエイジ値を保存させるエイジ記録部と、
前記データユニットに保存されたエイジ値を判読するエイジ判読部と、
前記判読されたエイジ値を通じて静的データ領域を判断する静的データ判断部と、を備え、
前記エイジ値は、前記データ及び他のデータ間での記録される時点の先後を相対的に表す値であり、
前記エイジ値は、前記不揮発性データ保存装置に少なくとも一つ以上存在するエイジカウンタによって記録され、
前記保存されるエイジ値は、前記エイジ値と共に保存されるデータを記録する時の前記エイジカウンタ値であり、
前記エイジカウンタの値は、データが記録されていないデータユニットであるフリーユニットが割当てられる度に値が変更されることを特徴とする装置。 - 前記エイジカウンタの値は、前記割当てられたフリーユニットに対するマッピングテーブルの余裕空間に記録され、前記マッピングテーブルが更新される時に共に保存されることを特徴とする請求項10に記載の装置。
- 前記判断された静的データ領域のデータを他のデータユニットに移動する磨耗度平準化データユニット変換部を備えることを特徴とする請求項10に記載の装置。
- 請求項1に記載の方法を具現するためのプログラムが記録されたコンピュータで読み取り可能な記録媒体。
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KR1020060129655A KR100881669B1 (ko) | 2006-12-18 | 2006-12-18 | 비휘발성 데이터 저장장치의 정적 데이터 영역 검출 방법,마모도 평준화 방법 및 데이터 유닛 병합 방법과 그 장치 |
KR10-2006-0129655 | 2006-12-18 |
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EP (1) | EP1936632A1 (ja) |
JP (1) | JP4812739B2 (ja) |
KR (1) | KR100881669B1 (ja) |
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US8028121B2 (en) | 2011-09-27 |
JP2008152909A (ja) | 2008-07-03 |
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