JP2009059422A - 半導体記憶装置およびその制御方法 - Google Patents
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Abstract
【解決手段】半導体記憶装置は、複数の第1データ内の誤りをそれぞれ検出するための複数の検出符号を生成する複数の検出符号生成部41乃至48と、各第1データとこれに対応する検出符号とから第1単位データが構成され、複数の第1単位データ内の誤りをそれぞれ訂正するための複数の第1訂正符号を生成する複数の第1訂正符号生成部61乃至68と、前記複数の第1単位データから第2単位データが構成され、この第2単位データ内の誤りを訂正するための第2訂正符号を生成する第2訂正符号生成部8と、第2単位データ、複数の第1訂正符号、及び第2訂正符号を不揮発に格納する半導体メモリ2とを含む。
【選択図】図5
Description
図2は、誤り訂正回路1のデータ書き込みに関する主要部を示すブロック図である。誤り訂正回路1は、それぞれが所定の大きさの複数の書き込みデータのそれぞれを1つの単位として、誤り訂正符号を生成するとともに、複数の書き込みデータ全体を1つの単位として別の誤り訂正符号を生成する。書き込みデータの数は、達成することが望まれる誤り訂正能力および採用される誤り訂正符号に応じて決定され、以下、書き込みデータが8個である例について説明する。
次に、誤り訂正回路1の、データ書き込み時の動作について図3乃至図6を参照して説明する。図3乃至図6は、書き込みの際の一時記憶回路3内のデータの状態を概略的に順に示している。
図6は、誤り訂正回路1のデータ読み出しに関する主要部を示すブロック図である。
Claims (15)
- 複数の第1データ内の誤りをそれぞれ検出するための複数の検出符号を生成する複数の検出符号生成部と、
各第1データとこれに対応する検出符号とから第1単位データが構成され、複数の第1単位データ内の誤りをそれぞれ訂正するための複数の第1訂正符号を生成する複数の第1訂正符号生成部と、
前記複数の第1単位データから第2単位データが構成され、この第2単位データ内の誤りを訂正するための第2訂正符号を生成する第2訂正符号生成部と、
前記第2単位データ、前記複数の第1訂正符号、及び前記第2訂正符号を不揮発に格納する半導体メモリと、
を具備することを特徴とする半導体記憶装置。 - 前記複数の第1訂正符号を用いて、前記複数の第1単位データ内の誤りをそれぞれ訂正する第1訂正部と、
前記複数の検出符号を用いて、前記第1訂正部により訂正された複数の第1データ内の誤りをそれぞれ検出し、かつ前記訂正された複数の第1データのそれぞれについての誤りの有無を示す第1誤り情報を生成する検出部と、
前記第1誤り情報および前記第2訂正符号を用いて、前記訂正された複数の第1データのうち誤りを含んだものに対して誤りを訂正する第2訂正部と、
をさらに具備することを特徴とする請求項1に記載の半導体記憶装置。 - 前記第1訂正部により訂正された複数の第1データからなる前記第1訂正済データと、前記第2訂正部により訂正された複数の第1データからなる前記第2訂正済データとの一方を選択して出力する選択部をさらに具備することを特徴とする請求項2に記載の半導体記憶装置。
- 前記検出部は、前記第1訂正済データ内の誤りの有無を示す第2誤り情報を生成し、
前記選択部は、前記第2誤り情報に基づいて、前記第1訂正済データ内に誤りが存在しない場合には前記第1訂正済データを出力し、前記第1訂正済データ内に誤りが存在する場合には前記第2訂正済データを出力することを特徴とする請求項3に記載の半導体記憶装置。 - 前記第2訂正符号生成部の誤り訂正能力は、前記第1訂正符号生成部の訂正能力よりも高いことを特徴とする請求項1乃至4のいずれかに記載の半導体記憶装置。
- 前記半導体メモリは、第1サイズを最小単位としてデータの読み込み、又は書き込みを行い、
前記複数の第1データのそれぞれのサイズは、前記第1サイズと等しいことを特徴とする請求項1乃至5のいずれかに記載の半導体記憶装置。 - 前記複数の第1データおよび前記複数の検出符号を一時的に記憶する一時記憶回路をさらに具備することを特徴とする請求項1乃至6のいずれかに記載の半導体記憶装置。
- 前記複数の検出符号生成部は、前記複数の検出符号を生成する処理を並列で行い、
前記複数の第1訂正符号生成部は、前記複数の第1訂正符号を生成する処理を並列で行うことを特徴とする請求項1乃至7のいずれかに記載の半導体記憶装置。 - 前記第2訂正部は、前記第1訂正部により訂正された複数の第1データ内に誤りが存在しない場合に、訂正処理を停止することを特徴とする請求項2に記載の半導体記憶装置。
- 前記半導体メモリは、NAND型フラッシュメモリであることを特徴とする請求項1乃至9のいずれかに記載の半導体記憶装置。
- 複数の第1データ内の誤りをそれぞれ検出するための複数の検出符号を生成する工程と、
各第1データとこれに対応する検出符号とから第1単位データが構成され、複数の第1単位データ内の誤りをそれぞれ訂正するための複数の第1訂正符号を生成する工程と、
前記複数の第1単位データと前記複数の第1訂正符号とから第2単位データが構成され、この第2単位データ内の誤りを訂正するための第2訂正符号を生成する工程と、
前記第2単位データ、前記複数の第1訂正符号、及び前記第2訂正符号を不揮発に格納する工程と、
を具備することを特徴とする半導体記憶装置の制御方法。 - 前記複数の第1訂正符号を用いて、前記複数の第1単位データ内の誤りをそれぞれ訂正する工程と、
前記複数の検出符号を用いて、前記第1訂正符号を用いて訂正された複数の第1データ内の誤りをそれぞれ検出することによって、前記訂正された複数の第1データのそれぞれについての誤りの有無を示す誤り情報を生成する工程と、
前記誤り情報および前記第2訂正符号を用いて、前記訂正された複数の第1データのうち誤りを含んだものに対して誤りを訂正する工程と、
をさらに具備することを特徴とする請求項11に記載の半導体記憶装置の制御方法。 - 前記第1訂正部により訂正された複数の第1データからなる前記第1訂正済データと、前記第2訂正部により訂正された複数の第1データからなる前記第2訂正済データとの一方を選択して出力する工程をさらに具備することを特徴とする請求項12に記載の半導体記憶装置の制御方法。
- 前記第1訂正済データ内の誤りの有無を示す第2誤り情報を生成する工程をさらに具備し、
前記出力する工程は、
前記第2誤り情報に基づいて、前記第1訂正済データ内に誤りが存在しない場合には前記第1訂正済データを出力し、前記第1訂正済データ内に誤りが存在する場合には前記第2訂正済データを出力することを特徴とする請求項13に記載の半導体記憶装置の制御方法。 - 前記第2訂正符号の誤り訂正能力は、前記第1訂正符号の訂正能力よりも高いことを特徴とする請求項11乃至13のいずれかに記載の半導体記憶装置の制御方法。
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JP2007225996A JP4564520B2 (ja) | 2007-08-31 | 2007-08-31 | 半導体記憶装置およびその制御方法 |
CN2008800066548A CN101622603B (zh) | 2007-08-31 | 2008-07-17 | 半导体存储器件及其控制方法 |
CN201110252163.5A CN102385538B (zh) | 2007-08-31 | 2008-07-17 | 半导体存储器件及其控制方法 |
PCT/JP2008/063344 WO2009028281A1 (en) | 2007-08-31 | 2008-07-17 | Semiconductor memory device and method of controlling the same |
EP08791594.8A EP2186004B1 (en) | 2007-08-31 | 2008-07-17 | Semiconductor memory device and method of controlling the same |
KR1020097018201A KR101120346B1 (ko) | 2007-08-31 | 2008-07-17 | 반도체 메모리 장치 및 그의 제어 방법 |
TW097128194A TWI437571B (zh) | 2007-08-31 | 2008-07-24 | 半導體記憶體裝置及其控制方法 |
US12/404,861 US8117517B2 (en) | 2007-08-31 | 2009-03-16 | Semiconductor memory device and method of controlling the same |
US13/090,539 US8196008B2 (en) | 2007-08-31 | 2011-04-20 | Semiconductor memory device and method of controlling the same |
US13/090,499 US8069394B2 (en) | 2007-08-31 | 2011-04-20 | Semiconductor memory device and method of controlling the same |
US13/465,624 US8386881B2 (en) | 2007-08-31 | 2012-05-07 | Semiconductor memory device and method of controlling the same |
US13/757,935 US8732544B2 (en) | 2007-08-31 | 2013-02-04 | Semiconductor memory device and method of controlling the same |
US14/231,140 US8959411B2 (en) | 2007-08-31 | 2014-03-31 | Semiconductor memory device and method of controlling the same |
US14/601,664 US9384090B2 (en) | 2007-08-31 | 2015-01-21 | Semiconductor memory device and method of controlling the same |
US14/920,510 US20160041875A1 (en) | 2007-08-31 | 2015-10-22 | Semiconductor memory device and method of controlling the same |
US15/421,746 US20170141799A1 (en) | 2007-08-31 | 2017-02-01 | Semiconductor memory device and method of controlling the same |
US16/357,696 US11038536B2 (en) | 2007-08-31 | 2019-03-19 | Semiconductor memory device and method of controlling the same |
US17/317,280 US11575395B2 (en) | 2007-08-31 | 2021-05-11 | Semiconductor memory device and method of controlling the same |
US18/148,060 US12074616B2 (en) | 2007-08-31 | 2022-12-29 | Semiconductor memory device and method of controlling the same |
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Cited By (17)
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JP2009080651A (ja) * | 2007-09-26 | 2009-04-16 | Toshiba Corp | 半導体記憶装置、及びその制御方法 |
JP2010277687A (ja) * | 2010-07-29 | 2010-12-09 | Toshiba Corp | 半導体記憶装置およびその制御方法 |
JP2011081776A (ja) * | 2009-09-11 | 2011-04-21 | Sony Corp | 不揮発性メモリ装置、メモリコントローラ、およびメモリシステム |
JP2011180911A (ja) * | 2010-03-02 | 2011-09-15 | Toshiba Corp | 不揮発性半導体記憶システム |
JP2011198272A (ja) * | 2010-03-23 | 2011-10-06 | Toshiba Corp | 半導体記憶装置および半導体記憶装置の制御方法 |
JP2011203878A (ja) * | 2010-03-24 | 2011-10-13 | Toshiba Corp | 半導体記憶装置 |
US8069394B2 (en) | 2007-08-31 | 2011-11-29 | Kabushiki Kaisha Toshiba | Semiconductor memory device and method of controlling the same |
JP2013016149A (ja) * | 2011-06-08 | 2013-01-24 | Panasonic Corp | メモリコントローラ及び不揮発性記憶装置 |
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