KR100918591B1 - 이진모드에서 다중상태 비휘발성 메모리 시스템의 선택적작동 - Google Patents
이진모드에서 다중상태 비휘발성 메모리 시스템의 선택적작동 Download PDFInfo
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- KR100918591B1 KR100918591B1 KR1020047003923A KR20047003923A KR100918591B1 KR 100918591 B1 KR100918591 B1 KR 100918591B1 KR 1020047003923 A KR1020047003923 A KR 1020047003923A KR 20047003923 A KR20047003923 A KR 20047003923A KR 100918591 B1 KR100918591 B1 KR 100918591B1
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C16/00—Erasable programmable read-only memories
- G11C16/02—Erasable programmable read-only memories electrically programmable
- G11C16/04—Erasable programmable read-only memories electrically programmable using variable threshold transistors, e.g. FAMOS
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C16/00—Erasable programmable read-only memories
- G11C16/02—Erasable programmable read-only memories electrically programmable
- G11C16/06—Auxiliary circuits, e.g. for writing into memory
- G11C16/10—Programming or data input circuits
- G11C16/12—Programming voltage switching circuits
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C11/00—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor
- G11C11/56—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using storage elements with more than two stable states represented by steps, e.g. of voltage, current, phase, frequency
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C11/00—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor
- G11C11/56—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using storage elements with more than two stable states represented by steps, e.g. of voltage, current, phase, frequency
- G11C11/5621—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using storage elements with more than two stable states represented by steps, e.g. of voltage, current, phase, frequency using charge storage in a floating gate
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C11/00—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor
- G11C11/56—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using storage elements with more than two stable states represented by steps, e.g. of voltage, current, phase, frequency
- G11C11/5621—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using storage elements with more than two stable states represented by steps, e.g. of voltage, current, phase, frequency using charge storage in a floating gate
- G11C11/5628—Programming or writing circuits; Data input circuits
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C16/00—Erasable programmable read-only memories
- G11C16/02—Erasable programmable read-only memories electrically programmable
- G11C16/04—Erasable programmable read-only memories electrically programmable using variable threshold transistors, e.g. FAMOS
- 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
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C2211/00—Indexing scheme relating to digital stores characterized by the use of particular electric or magnetic storage elements; Storage elements therefor
- G11C2211/56—Indexing scheme relating to G11C11/56 and sub-groups for features not covered by these groups
- G11C2211/564—Miscellaneous aspects
- G11C2211/5641—Multilevel memory having cells with different number of storage levels
Abstract
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Claims (12)
- 함께 삭제가능한 메모리셀 블록들로 배열된 메모리셀들을 구비한 플래시 비휘발성 메모리 시스템을 선택적으로 작동시키는 방법으로서, 개개의 메모리셀들은 2비트 이상(즉, 적어도 제1 및 제2 비트들)의 데이터를 저장하기 위해 4개 이상의 겹치지 않는 문턱저장레벨들(즉, 적어도 제1, 제2, 제3 및 제4 레벨들)에서 작동하고, 제1 레벨은 프로그래밍이 일어나는 삭제된 레벨이며 제4 레벨은 제1 레벨로부터 가장 멀리 떨어져 있고, 여기서 개개의 메모리셀들의 프로그래밍은, 제1 비트의 값에 따라, 메모리셀을 제1 레벨에 유지시키거나 메모리셀의 문턱을 제1 레벨로부터 제2 레벨로 이동시킴으로써 제1 프로그래밍 패스 동안 제1 논리페이지로부터의 제1 비트의 데이터를 메모리셀에 기입하는 것과, 그 후에 제2 비트의 값에 따라, 메모리셀의 문턱을 제2 레벨로부터 제3 레벨로 이동시키거나 제1 레벨로부터 제4 레벨로 이동시킴으로써 제2 프로그래밍 패스 동안 제2 논리페이지로부터의 제2 비트의 데이터를 메모리셀에 기입하는 것을 포함하고, 상기 선택적 작동 방법은,개개의 메모리셀들에 단지 1비트의 데이터를 저장하기 위해 메모리 시스템 내에서 하나 이상의 메모리셀 블록을 지정하는 단계;프로그래밍 동안, 데이터가 기입되도록 지정된 메모리셀 블록의 어드레스가 상기 지정된 하나 이상의 메모리셀 블록에 대응하는지 여부를 확인하는 단계;데이터가 기입되도록 지정된 메모리셀 블록의 어드레스가 상기 지정된 하나 이상의 메모리셀 블록에 대응하지 않는 경우, 제1 및 제2 프로그래밍 패스들 모두를 사용하여, 상기 지정된 하나 이상의 메모리셀 블록이 아닌 다른 메모리셀 블록의 개개의 메모리셀들에 데이터를 기입하는 단계로서, 상기 다른 메모리셀 블록의 프로그래밍은 주어진 양만큼 연속적으로 증가하는 크기를 갖는 연속 펄스들을 사용하여 일어나는 단계; 및데이터가 기입되도록 지정된 메모리셀 블록의 어드레스가 상기 지정된 하나 이상의 메모리셀 블록에 대응하는 경우, 제1 프로그래밍 패스를 생략하고 제2 프로그래밍 패스를 사용하여, 상기 지정된 하나 이상의 메모리셀 블록의 개개의 메모리셀들에 데이터를 기입하는 단계로서, 여기서 상기 지정된 하나 이상의 메모리셀 블록의 메모리셀들은 제1 레벨 또는 제4 레벨에만 개별적으로 프로그래밍되고, 제1 레벨로부터 제4 레벨로 상기 지정된 하나 이상의 블록의 프로그래밍은 상기 주어진 양을 초과하는 양만큼 연속적으로 증가하는 크기를 갖는 연속 펄스들을 사용하여 일어나고, 이에 의해 제4 레벨에서 상기 지정된 하나 이상의 블록의 메모리셀들의 문턱레벨들의 분포가 제1 및 제2 프로그래밍 패스들 모두가 사용되는 경우에 일어나는 것보다 넓은 단계;를 포함하는 것을 특징으로 하는 메모리 시스템의 선택적 작동 방법.
- 제1항에 있어서, 상기 하나 이상의 메모리셀 블록을 지정하는 단계는 상기 하나 이상의 메모리셀 블록을 어드레싱하여 접속(access)되는 기록(record)에 상기 지정을 유지하는 것을 포함하고, 상기 대응 여부를 확인하는 단계는 데이터가 기입되도록 지정된 메모리셀 블록의 어드레스를 사용하여 상기 기록에 접속하는 것을 포함하는 것을 특징으로 하는 메모리 시스템의 선택적 작동 방법.
- 제2항에 있어서, 상기 기록은 파일 배치표(FAT)의 부분으로서 유지되는 것을 특징으로 하는 메모리 시스템의 선택적 작동 방법.
- 제2항에 있어서, 상기 메모리 시스템 작동 방법은 개개의 메모리셀 블록들이 견디는 다수의 프로그래밍 및 삭제 사이클들의 추가 기록을 유지하는 단계를 더 포함하고, 상기 하나 이상의 메모리셀 블록을 지정하는 단계는 예정된 수의 프로그래밍 및 삭제 사이클들에 도달한 블록을 지정하는 것을 포함하는 메모리 시스템의 선택적 작동 방법.
- 메모리 시스템에 있어서,동시에 삭제가능한 블록들로 조직화된 재프로그래밍가능 전하저장소자들을 구비한 비휘발성 메모리셀들의 어레이; 및상태기계를 포함하는 프로그래밍 회로들;을 포함하며, 상기 상태기계는, 어드레싱된 블록의 개개의 전하저장소자들에 저장된 전하 레벨들이 삭제된 범위로부터 3개 이상의 추가적인 겹치지 않는 범위들 중 하나 내에 있을 때까지 제1 증분 변화율로 증가하게 하는 대응하는 2개 이상의 연속 프로그래밍 작동들에서, 2페이지 이상의 사용자 데이터로부터의 2비트 이상의 데이터가 상기 개개의 전하저장소자들에 프로그래밍되게 하지만, 지정된 하나 이상의 블록이 어드레싱되는 것에 응답하여, 상기 2개 이상의 연속 프로그래밍 작동들 중 하나만을 실행함으로써, 상기 지정된 하나 이상의 블록의 전하저장소자들에 저장된 전하 레벨들이 삭제된 범위로부터 상기 3개 이상의 범위들 중 상기 삭제된 범위로부터 가장 멀리 떨어진 하나 내에만 있을 때까지 제2 증분 변화율로 증가하게 제어하여, 지정된 하나 이상의 어드레스를 가진 블록의 전하저장소자당 단지 1비트의 데이터를 프로그래밍하도록 상기 전하저장소자들의 프로그래밍을 제한하고,여기서 전하 레벨에 있어 상기 제2 증분 변화율은 상기 제1 증분 변화율보다 크고, 이에 의해 상기 2개 이상의 연속 프로그래밍 작동들 중 단지 하나에 의한 프로그래밍은 상기 가장 멀리 떨어진 범위 내의 전하 레벨들의 분포가 상기 2개 이상의 연속 프로그래밍 작동들 모두에 의한 프로그래밍보다 넓게 하는 것을 특징으로 하는 메모리 시스템.
- 제5항에 있어서, 상기 프로그래밍 회로들은 사용자 데이터보다 빈번히 재기입되는 시스템 작동 데이터를 상기 지정된 하나 이상의 메모리셀 블록에 프로그래밍하는 것을 특징으로 하는 메모리 시스템.
- 제6항에 있어서, 상기 지정된 하나 이상의 메모리셀 블록에 프로그래밍된 상기 시스템 작동 데이터는 시스템 파일 배치표(FAT)를 포함하는 것을 특징으로 하는 메모리 시스템.
- 제5항에 있어서, 상기 비휘발성 메모리셀들의 어레이는 비트라인들과 전압원 사이에서 반도체 기판을 가로질러 제1 방향으로 연장하는 8개 이상의 메모리셀 트랜지스터들의 시리즈 스트링들을 포함하고, 워드라인들은 상기 기판을 가로질러 제2 방향으로 상기 스트링들을 가로질러 연장하고, 상기 제1 및 제2 방향들은 서로 직교하고, 상기 전하저장소자들은 상기 워드라인들이 가로지르는 메모리셀 트랜지스터들의 스트링들 내에 위치하는 것을 특징으로 하는 메모리 시스템.
- 제5항에 있어서, 상기 전하저장소자들은 전기전도성 부동게이트들을 포함하는 것을 특징으로 하는 메모리 시스템.
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US09/956,340 | 2001-09-17 | ||
US09/956,340 US6456528B1 (en) | 2001-09-17 | 2001-09-17 | Selective operation of a multi-state non-volatile memory system in a binary mode |
US10/229,258 US6717847B2 (en) | 2001-09-17 | 2002-08-26 | Selective operation of a multi-state non-volatile memory system in a binary mode |
US10/229,258 | 2002-08-26 | ||
PCT/US2002/029177 WO2003025949A1 (en) | 2001-09-17 | 2002-09-13 | Selective operation of a multi-state non-volatile memory system in a binary mode |
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KR100918591B1 true KR100918591B1 (ko) | 2009-09-24 |
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US (3) | US6717847B2 (ko) |
EP (1) | EP1433182B1 (ko) |
JP (1) | JP2005503640A (ko) |
KR (1) | KR100918591B1 (ko) |
CN (1) | CN1555559B (ko) |
AT (1) | ATE336788T1 (ko) |
DE (1) | DE60214023T2 (ko) |
TW (1) | TW574696B (ko) |
WO (1) | WO2003025949A1 (ko) |
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EP1433182A4 (en) | 2004-12-29 |
TW574696B (en) | 2004-02-01 |
ATE336788T1 (de) | 2006-09-15 |
EP1433182A1 (en) | 2004-06-30 |
US20040190337A1 (en) | 2004-09-30 |
US7385854B2 (en) | 2008-06-10 |
DE60214023D1 (de) | 2006-09-28 |
CN1555559A (zh) | 2004-12-15 |
US7177184B2 (en) | 2007-02-13 |
JP2005503640A (ja) | 2005-02-03 |
DE60214023T2 (de) | 2007-03-29 |
KR20040047835A (ko) | 2004-06-05 |
US6717847B2 (en) | 2004-04-06 |
US20070109864A1 (en) | 2007-05-17 |
WO2003025949A1 (en) | 2003-03-27 |
CN1555559B (zh) | 2012-05-30 |
EP1433182B1 (en) | 2006-08-16 |
US20030053334A1 (en) | 2003-03-20 |
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