KR20080016544A - 커플링 보상을 포함하는 비휘발성 저장소에 대한 판독 동작 - Google Patents
커플링 보상을 포함하는 비휘발성 저장소에 대한 판독 동작 Download PDFInfo
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- 비휘발성 저장소로부터 데이터를 판독하는 방법에 있어서,제 1 비휘발성 저장 소자로부터 데이터를 판독하도록 하는 요구를 수신하는 단계와;상기 요구에 응답하여 제 2 비휘발성 저장 소자 상에서 판독 동작을 수행하는 단계와, 상기 제 2 비휘발성 저장 소자는 상기 제 1 비휘발성 저장 소자에 인접하여 있고, 상기 제 2 비휘발성 저장소자는 데이터의 복수의 그룹핑들에 대한 데이터를 저장할 수 있고;상기 제 2 비휘발성 저장 소자에 저장될 수 있는 데이터의 상기 그룹핑의 서브세트에 기초하여 상기 제 1 비휘발성 저장 소자를 판독하기 위한 기준 값을 결정하는 단계와; 그리고상기 기준 값을 사용하여 상기 요구에 응답하여 상기 제 1 비휘발성 저장 소자에 저장된 데이터를 판독하는 단계를 포함하는 것을 특징으로 하는 비휘발성 저장소로부터 데이터를 판독하는 방법.
- 제 1 항에 있어서.데이터의 상기 복수의 그룹핑들은 더 낮은 페이지와 더 위쪽 페이지를 포함하는 것을 특징으로 하는 비휘발성 저장소로부터 데이터를 판독하는 방법.
- 제 2 항에 있어서,상기 기준 값을 결정하는 단계는 상기 제 2 비휘발성 저장 소자에 대해 더 위쪽 페이지 데이터를 판독하는 것을 포함하며, 상기 기준 값은 상기 제 2 비휘발성 저장 소자에 대해 더 낮은 페이지 데이터에 기초하지 않고 상기 더 위쪽 페이지 데이터에 기초하는 것을 특징으로 하는 비휘발성 저장소로부터 데이터를 판독하는 방법.
- 제 2 항에 있어서,상기 기준 값을 결정하는 단계와 상기 제 1 비휘발성 저장 소자에 저장된 데이터를 판독하는 단계는:더 위쪽 페이지 데이터가 상기 제 2 비휘발성 저장 소자에 대해 프로그래밍되는지 여부를 결정하는 것과;만약 상기 더 위쪽 페이지 데이터가 상기 제 2 비휘발성 저장 소자에 대해 프로그래밍되지 않는다면, 상기 제 2 비휘발성 저장 소자로부터의 플로팅 게이트 커플링 효과를 보상하지 않는 제 1 기준 값으로 상기 제 1 비휘발성 저장 소자 내의 데이터를 판독하는 것과;상기 제 2 비휘발성 저장 소자에 대한 더 위쪽 페이지 데이터가 데이터 상태들의 제 1 서브세트에 프로그래밍되는지 여부를 결정하는 것과;만약 상기 제 2 비휘발성 저장 소자에 대한 상기 더 위쪽 데이터가 데이터 상태들의 상기 제 1 서브세트에 프로그래밍되지 않는다면, 상기 제 1 기준으로 상 기 제 1 비휘발성 저장 소자 내의 데이터를 판독하는 것과; 그리고상기 제 2 비휘발성 저장 소자에 대한 상기 더 위쪽 데이터가 데이터 상태들의 상기 제 1 서브세트에 프로그래밍된다면, 상기 제 1 기준 플러스 오프셋으로 상기 제 1 비휘발성 저장 소자 내의 데이터를 판독하는 것을 포함하는 것을 특징으로 하는 비휘발성 저장소로부터 데이터를 판독하는 방법.
- 제 4 항에 있어서,상기 제 1 비휘발성 저장 소자는 제 1 데이터 상태, 제 2 데이터 상태, 제 3 데이터 상태, 및 제 4 데이터 상태를 포함하는 네 개의 데이터 상태들에서 데이터를 저장할 수 있고;상기 제 1 기준은 상기 제 2 데이터 상태와 상기 제 3 데이터 상태 사이의 임계 전압을 표시하고; 그리고상기 제 1 기준 플러스 오프셋으로 상기 제 1 비휘발성 저장 소자 내의 데이터를 판독하는 것은:상기 제 1 비휘발성 저장 소자에 대한 제어 게이트에 상기 제 1 기준에 대응하는 전압을 인가하는 것과,상기 제 1 비휘발성 저장 소자에 의해 전도(conduction)를 감지하는 것과,상기 제 1 비휘발성 저장 소자에 대한 상기 제어 게이트에 상기 제 1 기준 플러스 상기 오프셋에 대응하는 전압을 인가하는 것과,상기 제 1 비휘발성 저장 소장에 의해 전도를 감지하는 것과, 그리고적절한 결과를 저장하는 것을 포함하는 것을 특징으로 하는 비휘발성 저장소로부터 데이터를 판독하는 방법.
- 제 4 항에 있어서,상기 제 1 비휘발성 저장 소자는 제 1 데이터 상태, 제 2 데이터 상태, 제 3 데이터 상태 및 제 4 데이터 상태를 포함하는 네 개의 데이터 상태들에서 데이터를 저장할 수 있고; 그리고상기 제 1 비휘발성 저장 소자에 저장된 데이터를 판독하는 단계는 제 2 기준 값, 상기 제 2 기준 값 플러스 오프셋, 제 3 기준 값, 및 상기 제 3 기준 값 플러스 오프셋을 사용하여 판독 동작들을 수행하는 것을 더 포함하는 것을 특징으로 하는 비휘발성 저장소로부터 데이터를 판독하는 방법.
- 제 1 항에 있어서,상기 제 1 비휘발성 저장 소자는 데이터의 제 1 그룹핑들에 대한 인접한 비휘발성 저장 소자들에 쓰기 이후에 데이터의 제 2 그룹핑들에 대해 프로그래밍되는 데이터를 포함하는 것을 특징으로 하는 비휘발성 저장소로부터 데이터를 판독하는 방법.
- 제 1 항에 있어서,상기 제 1 비휘발성 저장 소자는 복수-상태 NAND 플래시 메모리 디바이스인 것을 특징으로 하는 비휘발성 저장소로부터 데이터를 판독하는 방법.
- 제 1 항에 있어서,상기 제 1 비휘발성 저장 소자는 플로팅 게이트를 포함하는 것을 특징으로 하는 비휘발성 저장소로부터 데이터를 판독하는 방법.
- 제 1 항에 있어서,상기 제 1 비휘발성 저장 소자는 전하를 저장하기 위한 유전체 영역을 포함하는 것을 특징으로 하는 비휘발성 저장소로부터 데이터를 판독하는 방법.
- 비휘발성 저장 시스템에 있어서,비휘발성 저장 소자들의 제 1 세트와 비휘발성 저장 소자들의 상기 제 1 세트에 인접한 비휘발성 저장 소자들의 제 2 세트를 포함하는 복수의 비휘발성 저장 소자들과, 비휘발성 저장 소자들의 상기 제 1 세트와 비휘발성 저장 소자들의 상기 제 2 세트는 데이터의 복수의 그룹핑들을 저장하고; 그리고상기 복수의 비휘발성 저장 소자들과 통신하는 하나 또는 그 이상의 관리 회로들을 포함하여 구성되며, 상기 하나 또는 그 이상의 관리 회로들은 비휘발성 저장 소자들의 상기 제 2 세트로부터 제 1 판독 이후에 비휘발성 저장 소자들의 상기 제 1 세트로부터 판독하고, 상기 하나 또는 그 이상의 관리 회로들은 상기 제 2 비 휘발성 저장 소자에 저장될 수 있는 데이터의 상기 그룹핑들의 서브세트에 기초하여 상기 제 1 비휘발성 저장 소자를 판독하기 위한 기준 값을 결정하며, 그리고 이후에 상기 기준 값을 사용하여 상기 제 1 비휘발성 저장 소자에 저장된 데이터를 판독하는 것을 특징으로 하는 비휘발성 저장 시스템.
- 제 11 항에 있어서.상기 하나 또는 그 이상의 관리 회로들은 상태 머신, 디코더들, 및 감지 증폭기들을 포함하는 것을 특징으로 하는 비휘발성 저장 시스템.
- 제 12 항에 있어서.상기 감지 증폭기들 각각은:판독되는 비휘발성 저장 소자와 통신하는 감지 노드와, 상기 감지 증폭기는 상기 감지 노드에서 전류 전도를 측정하여 판독되는 상기 비휘발성 저장 소자에 저장된 데이터를 감지하며,상기 감지 노드에 연결된 제 1 용량성 디바이스와,상기 감지 노드에 선택적으로 연결된 제 2 용량성 디바이스와; 그리고상기 제 2 용량성 디바이스에 연결된 선택 회로를 포함하여 구성되며, 상기 선택 회로는 인접한 비휘발성 저장 소자로부터 표시를 수신하고 그리고 상기 인접한 비휘발성 저장 소자로부터의 상기 표시에 기초하여 상기 제 2 용량성 디바이스를 상기 감지 노드에 선택적으로 연결시키는 것을 특징으로 하는 비휘발성 저장 시 스템.
- 제 11 항에 있어서,상기 비휘발성 저장 소자들은 복수-상태 NAND 플래시 메모리 디바이스들인 것을 특징으로 하는 비휘발성 저장 시스템.
- 제 11 항에 있어서,데이터의 상기 복수의 그룹핑들은 더 낮은 페이지들과 더 위쪽 페이지들을 포함하고; 그리고상기 하나 또는 그 이상의 관리 회로들은 상기 제 2 비휘발성 저장 소자의 더 위쪽 페이지 데이터를 판독함으로써 기준 값을 결정하고, 상기 기준 값은 상기 제 2 비휘발성 저장 소자에 대해 더 낮은 페이지 데이터에 기초하지 않고 상기 더 위쪽 페이지 데이터에 기초하는 것을 특징으로 하는 비휘발성 저장 시스템.
- 제 11 항에 있어서,비휘발성 저장 소자들의 상기 제 1 세트는 데이터의 제 1 그룹핑에 대해 인접한 비휘발성 저장 소자들에 쓰기 이후에 프로그래밍되는 데이터의 제 2 그룹핑을 포함하는 것을 특징으로 하는 비휘발성 저장 시스템.
- 제 11 항에 있어서,상기 복수의 비휘발성 저장 소자들은 플로팅 게이트를 포함하는 것을 특징으로 하는 비휘발성 저장 시스템.
- 제 11 항에 있어서,상기 복수의 비휘발성 저장 소자들은 전하를 저장하기 위한 유전체 영역들을 포함하는 것을 특징으로 하는 비휘발성 저장 시스템.
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US7321510B2 (en) | 2008-01-22 |
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