JP2012513060A - 均一な読み出し待ち時間のための冗長なデータ記憶 - Google Patents
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Abstract
【選択図】図9A
Description
半導体メモリは、データ記憶のために多くのコンピュータ及び電子デバイスにより使用されるデジタル記憶装置の一種である。ソリッドステート(半導体)回路のパッケージングは概して、磁気ディスクドライブよりも大きい耐久性かつ低い消費電力を半導体メモリに与える。半導体メモリデバイスの記憶容量の増加および半導体メモリの比較的安価なコストの増進になされてきた継続的な歩みと結びつけられたこれら特徴は、広範囲の用途に半導体メモリを使用することに寄与した。例えば、幾つかの用途において、不揮発性半導体メモリは、磁気ハードディスクに取って代わるために、又はプロセッサが電力供給されていない際に、それらの内容を保持するプロセッサのメモリ空間の領域に使用され得る。
上述したように、以下に限定されないが、フラッシュメモリ及び他の不揮発性半導体メモリを含むデジタル記憶装置の幾つかのタイプにおいて、データをメモリに書き込むために必要な時間量は、データをメモリから読み出すために必要な時間量よりも大幅に長い可能性がある。更に、消去操作は、書き込み操作または読み出し操作に比べて、完了するためのより長い時間量を必要とするかもしれない。
さて、図1Aを参照すると、例示的なメモリ装置(100)が示される。説明のために、本明細書のシステム及び方法は、フラッシュメモリに関して主として説明される。しかしながら、理解されるように、本明細書のシステム及び方法は、任意のタイプのデジタル記憶装置で利用されることができ且つ利用されることが意図されており、この場合、少なくとも1つの書き込み操作または消去操作は、読み出し操作に比べて完了するためにかなり長い時間量を必要とする。本システム及び方法が適用され得るデジタル記憶装置の他のタイプの例は、以下に限定されないが、相変化メモリ(即ち、PRAM)、紫外線消去型メモリ、電気的消去可能ROM(EEPROM)、及び他のプログラム可能不揮発性半導体メモリタイプを含む。
さて、図9Aを参照すると、メモリバンクのアレイにおいて均一な読み出し待ち時間を維持する例示的な方法(900)の流れ図が示される。例えば、方法(900)は、図8に関連して上述されたようなメモリシステム(800、図8)において、管理モジュール(805)の制御下で行われることができ、この場合、データの少なくとも1つの主記憶場所は、書き込み操作又は消去操作を実行するために、読み出し操作よりも多くの時間を必要とする。
Claims (15)
- メモリ装置(100、200、300、500、600、700)であって、
複数のメモリバンク(d0〜d7、m0〜m3、p、p0、p1)を含み、前記メモリバンク(d0〜d7、m0〜m3、p、p0、p1)に対する書き込み操作または消去操作が、前記バンク(d0〜d7、m0〜m3、p、p0、p1)に対する読み出し操作よりもかなり遅く、
前記メモリ装置(100、200、300、500、600、700)は、前記バンク(d0〜d7、m0〜m3、p、p0、p1)における主記憶場所が書き込み操作および消去操作の少なくとも1つを受けている際にデータの問い合わせに応じて前記データの前記主記憶場所の代わりに前記データの冗長な記憶領域を読み出すように構成され、前記メモリ装置(100、200、300、500、600、700)が、前記複数のメモリバンク(d0〜d7、m0〜m3、p、p0、p1)に格納されたデータに対して実質的に均一な読み出し待ち時間を含む、メモリ装置(100、200、300、500、600、700)。 - 前記メモリバンク(d0〜d7、m0〜m3、p、p0、p1)がフラッシュメモリからなる、請求項1に記載のメモリ装置(100、200、300、500、600、700)。
- 前記実質的に均一な読み出し待ち時間が、前記メモリバンク(d0〜d7、m0〜m3、p、p0、p1)の前記主記憶場所の書き込み待ち時間および消去待ち時間の少なくとも1つよりかなり小さい、請求項1に記載のメモリ装置(100、200、300、500、600、700)。
- 前記主記憶場所が前記書き込み操作または前記消去操作を受けている場合に、前記主記憶場所からの前記データの代わりに前記データの冗長な記憶領域からの前記データを用いるように構成された読み出しマルチプレクサ(810)を更に含む、請求項1に記載のメモリ装置(100、200、300、500、600、700)。
- 前記データの冗長な記憶領域が、前記主記憶場所から分離したメモリバンク(m0〜m3)からなり、その冗長なメモリバンク(p、p0、p1)が前記主記憶場所に格納されたデータをミラーリングするように構成されている、請求項1に記載のメモリ装置(100、200、300、500、600、700)。
- 前記要求されたデータが、前記複数のメモリバンク(d0〜d7、m0〜m3、p、p0、p1)の全体にわたって分散されている、請求項1に記載のメモリ装置(100、200、300、500、600、700)。
- 前記データの冗長な記憶領域は、前記要求されたデータが前記複数のメモリバンク(d0〜d7、m0〜m3、p、p0、p1)の全体にわたって分散された前記データの部分を用いて導出されるパリティデータを含む、請求項6に記載のメモリ装置(100、200、300、500、600、700)。
- 複数のメモリバンク(d0〜d7、m0〜m3、p、p0、p1)からなるアレイにおいて実質的に均一な読み出し待ち時間を維持する方法(900)であって、
データの問い合わせに応じて、前記メモリバンク(d0〜d7、m0〜m3、p、p0、p1)の前記データの主記憶場所が書き込み操作および消去操作の少なくとも1つを現在受けているか否かを判定し(915)、
前記データの前記主記憶場所が書き込み操作および消去操作の少なくとも1つを現在受けている場合に、前記主記憶場所の代わりに冗長な記憶領域から前記データを読み出すことを含む、方法(900)。 - 前記データが前記複数のメモリバンクにおける個々のメモリバンク(d0〜d7、m0〜m3、p、p0、p1)の全体にわたって分散されており、前記冗長な記憶領域から前記データを読み出すことが、前記データ及びパリティデータの分散された部分から前記データを再構成することを含む、請求項8に記載の方法(900)。
- 読み出しマルチプレクサ(810)が前記メモリバンク(d0〜d7、m0〜m3、p、p0、p1)の少なくとも1つから読み出されるデータの代わりに前記冗長な記憶領域からのデータを用いるように、前記読み出しマルチプレクサ(810)に制御信号を提供することを更に含む、請求項9に記載の方法(900)。
- 前記データが一時的な書き込みバッファに格納されているという判定に応じて、前記データを前記一時的な書き込みバッファから直接的に読み出すことを更に含む、請求項8に記載の方法(900)。
- 前記問い合わせが、アドレスポートで提供されるアドレスを含む、請求項8に記載の方法(900)。
- 複数のメモリバンク(d0〜d7、m0〜m3、p、p0、p1)であって、前記メモリバンク(d0〜d7、m0〜m3、p、p0、p1)に対する書き込み操作または消去操作が、前記メモリバンクに対する読み出し操作よりもかなり遅い、複数のメモリバンク(d0〜d7、m0〜m3、p、p0、p1)と、
要求されたデータの前記メモリバンク(d0〜d7、m0〜m3、p、p0、p1)における主記憶場所が書き込み操作および消去操作の少なくとも1つを受けているという判定に応じて、冗長な記憶領域から前記要求されたデータを読み出すように構成された読み出しマルチプレクサ(810)とを含む、データ記憶システム(800)。 - 前記複数のメモリバンク(d0〜d7、m0〜m3、p、p0、p1)の全体にわたって分散された断片化データ、及び格納されたパリティデータから前記主記憶場所に格納された前記データを再構成するように構成された再構成モジュール(305、505、510、825)を更に含む、請求項13に記載のデータ記憶システム(800)。
- 外部プロセスから同期して書き込みデータを受け取り、前記書き込みデータを格納すると同時に、互い違いの書き込みプロセスが前記書き込みデータを前記複数のメモリバンク(d0〜d7、m0〜m3、p、p0、p1)に書き込むように構成された書き込みバッファ(815)を更に含む、請求項13に記載のデータ記憶システム(800)。
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- 2008-12-19 JP JP2011542097A patent/JP5654480B2/ja not_active Expired - Fee Related
- 2008-12-19 KR KR1020117014054A patent/KR101638764B1/ko active IP Right Grant
- 2008-12-19 EP EP08879034A patent/EP2359248A4/en not_active Withdrawn
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JP2020524839A (ja) * | 2017-06-23 | 2020-08-20 | グーグル エルエルシー | Nandバッファを有するnandフラッシュストレージデバイス |
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Also Published As
Publication number | Publication date |
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US20110258362A1 (en) | 2011-10-20 |
KR101638764B1 (ko) | 2016-07-22 |
EP2359248A1 (en) | 2011-08-24 |
EP2359248A4 (en) | 2012-06-13 |
JP5654480B2 (ja) | 2015-01-14 |
KR20110106307A (ko) | 2011-09-28 |
CN102257482A (zh) | 2011-11-23 |
WO2010071655A1 (en) | 2010-06-24 |
CN102257482B (zh) | 2015-06-03 |
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