JP2008535144A - 結合の補償を含む不揮発性記憶のための読み出し動作 - Google Patents
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Abstract
Description
本出願は、この出願と同日に出願に出願されたJian Chenによる米国特許出願、発明の名称「Compensating For Coupling During Read Operations Of Non−Volatile Memory」、代理人ドケット番号SAND−01040US0に関連付けられ、その全体は参照により本明細書に組み込まれる。
検出モジュール380(図8を参照)は、起動信号BLS(図14(A))によってビットライン36に接続される。電圧クランプは、BLC(図14(B))によって起動される。事前充電回路640は、制御信号FLT(図14(C))を備えた制限電流源として起動される。
検出増幅部600は、トランジスタ658を介して信号INVを接地させるリセット信号RST(図14(D))によって初期化される。従って、リセットのときに、INVはLOWに設定される。同時に、pトランジスタ663は相補信号LATをVdd、つまりHIGH(図14(H))に引き上げる。
制御された事前充電段階後、最初のDC高電流検出段階が始まり、信号SENが識別回路650によって検出される。検出では、所定レベルよりも高い伝導電流を備えているメモリセルを識別する。識別回路650は2つのpトランジスタ654と656を直列に備えており、それらは信号INVを記録するノード657の引き上げとして機能する。pトランジスタ654はLOWになる読み出しストローブ信号STBによって起動され、pトランジスタ656はLOWになる内部検出ノード631におけるSEN信号によって起動される。高電流メモリセルは、信号SENを0V近くにするか、もしくは、少なくともビットラインがpトランジスタ656をオフにするほど十分に高く事前充電されること不可能にする。例えば、弱い引き上げが500nAの電流に制限された場合、700nAの伝導電流を備えたセルは引き上げない(図14(G1))。STBがラッチするためにLOWにストローブすると、ノード657におけるINVはVddに引き上げられる。これは、ラッチ回路660のINVをHIGH、LATをLOWに設定する(図14(H1))。
前もって引き下げられていないビットライン内の伝導電流を検出する前に、事前充電回路は信号FLTをLOWにすることによって起動され、内部検出ノード631をVddに事前充電し(図14(C)と図14(I2)〜14(I4))、隣接ビットライン上の電圧低下のために部分的に下に結合されたかもしれないビットラインに事前充電する。
一実施形態では、AC(交流、過渡電流)検出は、浮遊させた内部検出ノード631における電圧降下を決定することによって実行される。これは、内部検出ノード631に接続したキャパシタCSA652を利用し、伝導電流がそれを充電する(ノードSEN上の電圧を低減する)速度を考慮する識別又は比較回路650によって実現される。集積回路環境では、キャパシタ652は一般的にトランジスタとともに実装されるが、他の実装形態であってもよい。キャパシタ652は所定の静電容量(例えば、30fF)を有し、それは最適な電流を決定するために選択される。限界電流値(一般的に、100〜1000nAの範囲内)は、充電期間の適切な調整によって設定される。
第1の所定検出期間の最後で、SENは、ビットライン内の伝導電流に依存するある電圧まで減少する(図14(G)の曲線G2〜G4を参照)。一例として、この第1段階の限界電流は、300nAとなるように設定される。キャパシタCSA652、検出期間T1及びpトランジスタ656の閾値電圧は、限界電流(例えば、300nA)よりも高い伝導電流に対応する信号SENが、識別回路650内のトランジスタ656をオンにするのに十分な低さになるようにする。ラッチ信号STBがLOWにストローブすると、出力信号INVはHIGHに引っ張られ、ラッチ660によってラッチされる(図14(E)と図14(H)(曲線H2))。一方、限界電流より低い伝導電流に対応する信号SENは、トランジスタ656をオン状態にできない信号SENを生成する。この場合、ラッチ660は変化しないままであり、その場合はLATはHIGHに留まる(図14(H3)と14(H4))。従って、識別回路650は、検出期間によって設定された基準電流に対して、ビットライン内の伝導電流の大きさを実質的に決定することが分かる。
予め引き下げられていないビットライン36などのビットライン内の伝導電流の次の検出の前に、事前充電回路が信号FLTによって起動され、内部検出ノード631をVddまで事前充電する(図14(C)(6)及び図14(I3)(6)〜14(I4)(6))。
検出増幅部600が検出しようとすると、事前充電回路642は、FLTがHIGHなることによって停止させられる(図14(C))。第2検出期間T2は、ストローブ信号STBのアサートによって設定される。検出期間中、伝導電流は(もしあれば)、キャパシタを充電する。キャパシタ652がビットライン36内の伝導電流の排出動作を介して充電しているときに、SENはVddから低下する。
第2の所定検出期間T2の最後で、SENはビットライン36内の伝導電流に依存して同じ電圧まで低下する(図14(G)(曲線G3とG4))。1例として、第2段階の限界電流は、100nAとなるように設定される。この場合、220nAの伝導電流を備えたメモリセルは、そのINVをHIGHにラッチし(図14(H))、次にビットラインを接地させる(図14(I3))。一方、40nAの伝導電流を備えたメモリセルは、ラッチの(LATをHIGHに設定した)状態に影響を与えない。
最後に、読み出し段階では、転送ゲート488における制御信号NCOは、ラッチした信号SEN2を読み出して、バス499に読み出すことを可能にする(図14(J)と14(K))。
Claims (18)
- 不揮発性記憶からデータを読み出す方法であって、
第1不揮発性記憶要素からデータを読み出すための要求を受け取る工程と、
前記要求に応じて第2不揮発性記憶要素で読み出し動作を実行する工程と、
前記第2不揮発性記憶要素内に記憶可能なグループ化データのサブセットに基づいて、前記第1不揮発性記憶要素を読み出すための基準値を決定する工程と、
前記基準値を用いて、前記要求に応じて前記第1不揮発性記憶要素内に記憶したデータを読み出す工程と、を備えており、
前記第2不揮発性記憶要素は、前記第1不揮発性記憶要素に隣接しており、複数のグループ化データを記憶可能である方法。 - データの前記複数のグループ化データが、下側ページと上側ページを備えている請求項1に記載の方法。
- 基準値を決定する工程が、前記第2不揮発性記憶要素の上側ページのデータを読み出す工程を備えており、
前記基準値が、前記第2不揮発性記憶要素の前記上側ページのデータに基づいており、下側ページのデータには基づいていない請求項2に記載の方法。 - 基準値を決定して、前記第1不揮発性記憶要素内に記憶したデータを読み出す工程が、
前記第2不揮発性記憶要素の上側ページのデータがプログラムされたか否かを決定する工程と、
前記第2不揮発性記憶要素の上側ページのデータがプログラムされていないときに、前記第2不揮発性記憶要素からのフローティングゲート結合効果を補償しない第1基準値を用いて前記第1不揮発性記憶要素内のデータを読み出す工程と、
前記第2不揮発性記憶要素の上側ページのデータが第1サブセットのデータ状態にプログラムされているか否かを決定する工程と、
前記第2不揮発性記憶要素の上側ページのデータが前記第1サブセットのデータ状態にプログラムされていないときに、前記第1基準を用いて前記第1不揮発性記憶要素内のデータを読み出す工程と、
前記第2不揮発性記憶要素の上側ページのデータが前記第1サブセットのデータ状態にプログラムされているときに、前記第1基準+オフセットを用いて前記第1不揮発性記憶要素内のデータを読み出す工程と、を備えている請求項2に記載の方法。 - 前記第1不揮発性記憶要素が、第1データ状態、第2データ状態、第3データ状態及び第4データ状態を含む4つのデータ状態でデータを記憶可能であり、
前記第1基準が、前記第2データ状態と前記第3データ状態の間の閾値電圧を示しており、
前記第1基準+オフセットを用いた前記第1不揮発性記憶要素内のデータの前記読み出し工程が、
前記第1不揮発性記憶要素の制御ゲートに前記第1基準に対応する電圧を印加する工程と、
前記第1不揮発性記憶要素による導通を検出する工程と、
前記第1不揮発性記憶要素の前記制御ゲートに前記第1基準+オフセットに対応する電圧を印加する工程と、
前記第1不揮発性記憶要素による導通を検出する工程と、
適切な結果を記憶する工程と、を備えている請求項4に記載の方法。 - 前記第1不揮発性記憶要素が、第1データ状態、第2データ状態、第3データ状態及び第4データ状態を含む4つのデータ状態でデータを記憶可能であり、
前記第1不揮発性記憶要素内に記憶されたデータを読み出す工程が、さらに、第2基準値、前記第2基準値+オフセット、第3基準値、及び前記第3基準値+オフセットを用いて読み出し動作を実行する工程を備えている請求項4に記載の方法。 - 前記第1不揮発性記憶要素が、第1グループ化データの隣接する不揮発性記憶要素への書き込みに続いて、第2グループ化データに対してプログラムされたデータを備えている請求項1に記載の方法。
- 前記第1不揮発性記憶要素が、マルチ状態NANDフラッシュメモリ素子である請求項1に記載の方法。
- 前記第1不揮発性記憶要素が、フローティングゲートを備えている請求項1に記載の方法。
- 前記第1不揮発性記憶要素が、電荷を蓄積するための誘電体領域を備えている請求項1に記載の方法。
- 複数の不揮発性記憶要素と1つ以上の管理回路を備えている不揮発性記憶システムであって、
複数の不揮発性記憶要素は、
第1不揮発性記憶要素の集合と、
前記第1不揮発性記憶要素の集合に隣接する第2不揮発性記憶要素の集合と、を備えており、
前記第1不揮発性記憶要素と前記第2不揮発性記憶要素が、複数のグループ化データを記憶しており、
1つ以上の管理回路は、
前記複数の不揮発性記憶要素と通信しており、
前記第2不揮発性記憶要素の集合からの第1読み出しの後に前記第1不揮発性記憶要素の集合から読み出しており、
前記第2不揮発性記憶要素内に記憶可能な前記グループ化データのサブセットに基づいて前記第1不揮発性記憶要素を読み出す基準値を決定しており、
続いて前記基準値を用いて、前記第1不揮発性記憶要素内に記憶されたデータを読み出している不揮発性記憶システム。 - 前記1つ以上の管理回路が、状態マシンと復号部と検出増幅部を備えている請求項11に記載の不揮発性記憶システム。
- 前記検出増幅器の各々が、
読み出される不揮発性記憶要素と通信し、前記検出増幅部が前記検出ノードにおける電流の導通を測定し、読み出される前記不揮発性記憶要素内に記憶されたデータを検出する検出ノードと、
前記検出ノードに接続される第1容量性素子と、
前記検出ノードに選択的に接続される第2容量性素子と、
前記第2容量性素子を選択的に接続する選択回路と、を備えており、
前記選択回路は、前記第2容量性素子に接続されており、隣接する不揮発性記憶要素からの指示を受け取って、前記隣接する不揮発性記憶要素からの前記指示に基づいて前記検出ノードに前記第2容量性素子を選択的に接続する請求項12に記載の不揮発性記憶システム。 - 前記不揮発性記憶要素が、マルチ状態NANDフラッシュメモリ素子である請求項11に記載の不揮発性記憶システム。
- 前記複数のグループのデータが、下側ページと上側ページを備えており、
前記1つ以上の管理回路は、前記第2不揮発性記憶要素の上側ページのデータを読み出すことによって基準値を決定する手段を備えており、
前記基準値は、前記第2不揮発性記憶要素の前記上側ページに基づいており、前記下側ページには基づいていない請求項11に記載の不揮発性記憶システム。 - 前記第1不揮発性記憶要素の集合が、第1グループのデータの隣接する不揮発性記憶要素への書き込みに続いてプログラムされた第2グループのデータを備えている請求項11に記載の不揮発性記憶システム。
- 前記複数の不揮発性記憶要素が、フローティングゲートを備えている請求項11に記載の不揮発性記憶システム。
- 前記複数の不揮発性記憶要素が、電荷を蓄積する誘電体領域を備えている請求項11に記載の不揮発性記憶システム。
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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US11/099,049 US7187585B2 (en) | 2005-04-05 | 2005-04-05 | Read operation for non-volatile storage that includes compensation for coupling |
US11/099,049 | 2005-04-05 | ||
PCT/US2006/011813 WO2006107731A1 (en) | 2005-04-05 | 2006-03-31 | Read operation for non-volatile storage that includes compensation for coupling |
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JP2008535144A true JP2008535144A (ja) | 2008-08-28 |
JP4778553B2 JP4778553B2 (ja) | 2011-09-21 |
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KR (1) | KR100934496B1 (ja) |
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TW200901203A (en) | 2009-01-01 |
KR20080016544A (ko) | 2008-02-21 |
US20060221714A1 (en) | 2006-10-05 |
US20070103982A1 (en) | 2007-05-10 |
CN101218650B (zh) | 2012-08-08 |
US20070109850A1 (en) | 2007-05-17 |
US20070103975A1 (en) | 2007-05-10 |
US20070109846A1 (en) | 2007-05-17 |
US20070103987A1 (en) | 2007-05-10 |
TWI370451B (en) | 2012-08-11 |
TW200901202A (en) | 2009-01-01 |
EP1866931A1 (en) | 2007-12-19 |
KR100934496B1 (ko) | 2009-12-30 |
TW200703341A (en) | 2007-01-16 |
US7301808B2 (en) | 2007-11-27 |
TWI370454B (en) | 2012-08-11 |
US7301839B2 (en) | 2007-11-27 |
JP4778553B2 (ja) | 2011-09-21 |
TWI380308B (en) | 2012-12-21 |
US7301816B2 (en) | 2007-11-27 |
CN101218650A (zh) | 2008-07-09 |
US7187585B2 (en) | 2007-03-06 |
TWI323465B (en) | 2010-04-11 |
TW200845015A (en) | 2008-11-16 |
US7414886B2 (en) | 2008-08-19 |
WO2006107731A1 (en) | 2006-10-12 |
US7321510B2 (en) | 2008-01-22 |
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