JP2008077810A - 不揮発性半導体記憶装置 - Google Patents
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- 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
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- G—PHYSICS
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- G—PHYSICS
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- G11C—STATIC STORES
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Abstract
【解決手段】閾値電圧の差によりNビット(N≧2)の情報を記憶することが可能なメモリセルを複数配列させたメモリセルアレイと、メモリセルアレイに記憶される一定のビット数のデータビットごとに、誤り訂正のためのパリティデータを付加するパリティデータ付加回路と、データビットとパリティデータとにより構成されるフレームデータのビット数がNの倍数であり、フレームデータをN個のサブフレームデータに均等に分割するフレーム変換回路と、N個に分割された各々のサブフレームデータをNビットの情報の各々に対応し構成されるN個のサブページに各々記憶させるためのプログラム回路を備えたことを特徴とする不揮発性半導体記憶装置を提供することにより上記課題を解決する。
【選択図】図2
Description
また、本発明の一の態様に係る不揮発性半導体記憶装置は、閾値電圧の差によりNビット(N≧2)の情報を記憶することが可能なメモリセルを複数配列させたメモリセルアレイと、前記メモリセルアレイに記憶される一定のビット数のデータビットごとに、誤り訂正のためのパリティデータを付加するパリティデータ付加回路と、前記データビットとパリティデータとにより構成されるフレームデータのビット数がNの倍数でない場合に、前記フレームデータのうち前記パリティデータの一部を取り除くことによりNの倍数のビット数とし、前記Nの倍数のビット数のデータを均等にN個のサブフレームデータに分割するフレーム変換回路と、前記N個に分割された各々のサブフレームデータを前記Nビットの情報の各々に対応し構成されるN個のサブページに各々記憶させるためのプログラム回路を備えたことを特徴とする。
本発明の実施の形態における多値記憶について説明する。本発明の実施の形態における多値記憶とは、NANDセル型フラッシュメモリにおいて、1つのメモリセルにおける閾値電圧の値を複数設けることにより行うものである。
本発明における一実施の形態を以下に記載する。
〔書き込み方法〕
次に、本実施の形態における不揮発性半導体記憶装置のデータの書き込み方法について説明する。データの書き込みは、MLC領域32への書き込み(MLCライト)とSLC領域31への書き込み(SLCライト)の2つの書き込みモードを有している。
データの読み出しは、読み出しシーケンスが入出力端子11を介し入力することにより行われる。入出力端子11より入力した読み出しシーケンスは、制御回路12に伝達される。制御回路12では、読み出しシーケンスより、読み出しコマンド及び読み出しアドレスを生成し、読み出しコマンドはコマンド入出力バッファ17に伝達され、読み出しアドレスは、アドレスバッファ18に伝達される。コマンド入出力バッファ17及びアドレスバッファ18より、ワード線制御回路20及びビット線制御回路22による制御により、メモリセルアレイ23における読み出しアドレスが指定するアドレスのメモリセルからデータが読み出され、ビット線制御回路22に伝達される。ビット線制御回路22に伝達された読み出されたデータは、データ入出力バッファ16を介し、リードバッファ24に伝達される。リードバッファ24に伝達され蓄積された閾値レベルによるデータは、メモリセル単位で尤度計算回路25に伝達され、各々のサブページの尤度値が計算される。この後、ECCフレーム分の尤度値が順次ECC回路13に伝達され、誤り訂正回路28において所定の誤り訂正がなされた後、制御回路12に伝達され、入出力端子11を介し外部へと出力される。
第2の実施の形態は、フレーム変換回路15において形成されたサブフレームデータのECCページデータへの配置が異なるものである。
第3の実施の形態は、フレーム変換回路15において形成されたサブフレームデータのECCページデータへの配置が異なるものである。
第4の実施の形態は、データビットとパリティデータからなるECCフレームのビット数が、多値記憶を行うメモリセルの多値のビット数の倍数でない場合である。即ち、Nビットの多値記憶を行うメモリセルにおいて、ECCフレームのビット数がNの倍数ではない場合である。具体的には、図14に示すように多値記憶として1つのメモリセルに3ビットの記憶する場合であって、ECCフレームのビット数が13ビットである場合である。この場合、フレーム変換回路15において、ECCフレームのビット数である13を多値のビット数である3で割った余りのビットを消失ビットとして処理することにより、4ビットのサブフレームデータであるサブフレーム802a、802b、802cを形成し、メモリセルに記憶させるものである。これにより、多値記憶を高いメモリセル効率で行うことが可能となる。
第5の実施の形態は、第4の実施の形態と同様に、ECCフレームのビット数が、多値記憶を行うメモリセルの多値のビット数の倍数でない場合である。即ち、Nビットの多値記憶を行うメモリセルにおいて、ECCフレームのビット数がNの倍数ではない場合である。具体的には、図15に示すように多値記憶として1つのメモリセルに3ビットの記憶する場合であって、ECCフレームのビット数が13ビットである場合である。この場合、ECCフレームのビット数である13を多値のビット数である3で割った値を切り上げてサブフレームのビット数とするものである。
Claims (5)
- 閾値電圧の差によりNビット(N≧2)の情報を記憶することが可能なメモリセルを複数配列させたメモリセルアレイと、
前記メモリセルアレイに記憶される一定のビット数のデータビットごとに、誤り訂正のためのパリティデータを付加するパリティデータ付加回路と、
前記データビットとパリティデータとにより構成されるフレームデータのビット数がNの倍数であり、前記フレームデータをN個のサブフレームデータに均等に分割するフレーム変換回路と、
前記N個に分割された各々のサブフレームデータを前記Nビットの情報の各々に対応し構成されるN個のサブページに各々記憶させるためのプログラム回路と、
を備えたことを特徴とする不揮発性半導体記憶装置。 - 前記パリティデータは、前記N個のサブページのうち、隣接する閾値電圧の状態間におけるビットの変化が最も多いサブページより順に、記憶するものであることを特徴とする請求項1に記載の不揮発性半導体記憶装置。
- 閾値電圧の差によりNビット(N≧2)の情報を記憶することが可能なメモリセルを複数配列させたメモリセルアレイと、
前記メモリセルアレイに記憶される一定のビット数のデータビットごとに、誤り訂正のためのパリティデータを付加するパリティデータ付加回路と、
前記データビットとパリティデータとにより構成されるフレームデータのビット数がNの倍数でない場合に、前記フレームデータのうち前記パリティデータの一部を取り除くことによりNの倍数のビット数とし、前記Nの倍数のビット数のデータを均等にN個のサブフレームデータに分割するフレーム変換回路と、
前記N個に分割された各々のサブフレームデータを前記Nビットの情報の各々に対応し構成されるN個のサブページに各々記憶させるためのプログラム回路と、
を備えたことを特徴とする不揮発性半導体記憶装置。 - 閾値電圧の差によりNビット(N≧2)の情報を記憶することが可能なメモリセルを複数配列させたメモリセルアレイと、
前記メモリセルアレイに記憶される一定のビット数のデータビットごとに、誤り訂正のためのパリティデータを付加するパリティデータ付加回路と、
前記データビットとパリティデータとにより構成されるフレームデータのビット数がNの倍数でない場合に、前記フレームデータに前記データビットの一部を加えることによりNの倍数のビット数とし、前記Nの倍数のビット数のデータを均等にN個のサブフレームデータに分割するフレーム変換回路と、
前記N個に分割された各々のサブフレームデータを前記Nビットの情報の各々に対応し構成されるN個のサブページに各々記憶させるためのプログラム回路と、
を備えたことを特徴とする不揮発性半導体記憶装置。 - 閾値電圧の差によりNビット(N≧2)の情報を記憶することが可能なメモリセルを複数配列させた多値メモリ領域と、閾値電圧の差により1ビットの情報を記憶することが可能なメモリセルを複数配列させた2値メモリ領域からなり、2値メモリ領域に情報を記憶した後、前記2値メモリ領域に記憶されている情報を読み出し、その後、多値メモリ領域に情報を書き込む構成のメモリセルアレイと、
前記2値メモリ領域に情報を書き込む際に、前記メモリセルアレイに書き込まれる一定のビット数のデータビットごとに、誤り訂正のためのパリティデータを付加するパリティデータ付加回路と、
前記多値メモリ領域または2値メモリ領域から読み出した閾値電圧の値より、誤り訂正の処理のための尤度情報を生成する尤度計算回路と、
前記尤度情報に基づき前記読み出しデータのエラーを訂正する誤り訂正回路と、
前記2値メモリ領域に記憶されている情報からなるフレームデータをN個のサブフレームデータに分割するフレーム変換回路と、
前記多値メモリ領域において、前記N個に分割された各々のサブフレームデータを前記Nビットの情報の各々に対応し構成されるN個のサブページに各々記憶させるためのプログラム回路と、
を備えたことを特徴とする不揮発性半導体記憶装置。
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US11/860,015 US8136014B2 (en) | 2006-09-25 | 2007-09-24 | Non-volatile semiconductor memory device |
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US20120144273A1 (en) | 2012-06-07 |
US8136014B2 (en) | 2012-03-13 |
US20080301532A1 (en) | 2008-12-04 |
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