WO2006078531A3 - Scheduling of housekeeping operations in flash memory systems - Google Patents

Scheduling of housekeeping operations in flash memory systems Download PDF

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Publication number
WO2006078531A3
WO2006078531A3 PCT/US2006/001070 US2006001070W WO2006078531A3 WO 2006078531 A3 WO2006078531 A3 WO 2006078531A3 US 2006001070 W US2006001070 W US 2006001070W WO 2006078531 A3 WO2006078531 A3 WO 2006078531A3
Authority
WO
WIPO (PCT)
Prior art keywords
housekeeping operations
command
housekeeping
scheduling
execution
Prior art date
Application number
PCT/US2006/001070
Other languages
French (fr)
Other versions
WO2006078531A2 (en
Inventor
Alan David Bennett
Sergey Anatolievich Gorobets
Andrew Tomlin
Charles Schroter
Original Assignee
Sandisk Corp
Alan David Bennett
Sergey Anatolievich Gorobets
Andrew Tomlin
Charles Schroter
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US11/040,325 external-priority patent/US20060161724A1/en
Application filed by Sandisk Corp, Alan David Bennett, Sergey Anatolievich Gorobets, Andrew Tomlin, Charles Schroter filed Critical Sandisk Corp
Priority to JP2007552175A priority Critical patent/JP4362534B2/en
Priority to AT06718177T priority patent/ATE442627T1/en
Priority to KR1020077017713A priority patent/KR101304254B1/en
Priority to EP06718177A priority patent/EP1856616B1/en
Priority to DE602006009081T priority patent/DE602006009081D1/en
Publication of WO2006078531A2 publication Critical patent/WO2006078531A2/en
Publication of WO2006078531A3 publication Critical patent/WO2006078531A3/en
Priority to IL184675A priority patent/IL184675A0/en

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11C—STATIC STORES
    • G11C16/00—Erasable programmable read-only memories
    • 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
    • G11C16/34—Determination of programming status, e.g. threshold voltage, overprogramming or underprogramming, retention
    • G11C16/349—Arrangements for evaluating degradation, retention or wearout, e.g. by counting erase cycles
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F12/00—Accessing, addressing or allocating within memory systems or architectures
    • G06F12/02—Addressing or allocation; Relocation
    • G06F12/0223—User address space allocation, e.g. contiguous or non contiguous base addressing
    • G06F12/023—Free address space management
    • G06F12/0238—Memory management in non-volatile memory, e.g. resistive RAM or ferroelectric memory
    • G06F12/0246—Memory management in non-volatile memory, e.g. resistive RAM or ferroelectric memory in block erasable memory, e.g. flash memory
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2212/00—Indexing scheme relating to accessing, addressing or allocation within memory systems or architectures
    • G06F2212/72—Details relating to flash memory management
    • G06F2212/7205—Cleaning, compaction, garbage collection, erase control

Abstract

A re-programmable non-volatile memory system, such as a flash EEPROM system, having its memory cells grouped into blocks of cells that are simultaneously erasable is operated to perform memory system housekeeping operations in the foreground during execution of a host command, wherein the housekeeping operations are unrelated to execution of the host command. Both one or more such housekeeping operations and execution of the host command are performed within a time budget established for executing that particular command. One such command is to write data being received to the memory. One such housekeeping operation is to level out the wear of the individual blocks that accumulates through repetitive erasing and re-programming.
PCT/US2006/001070 2005-01-20 2006-01-11 Scheduling of housekeeping operations in flash memory systems WO2006078531A2 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
JP2007552175A JP4362534B2 (en) 2005-01-20 2006-01-11 Scheduling housekeeping operations in flash memory systems
AT06718177T ATE442627T1 (en) 2005-01-20 2006-01-11 SCHEDULING FOR ORGANIZATIONAL OPERATIONAL PROCESSES IN FLASH STORAGE SYSTEMS
KR1020077017713A KR101304254B1 (en) 2005-01-20 2006-01-11 Scheduling of housekeeping operations in flash memory systems
EP06718177A EP1856616B1 (en) 2005-01-20 2006-01-11 Scheduling of housekeeping operations in flash memory systems
DE602006009081T DE602006009081D1 (en) 2005-01-20 2006-01-11 TERMINATION FOR ORGANIZATIONAL OPERATING PROCEDURES IN FLASH STORAGE SYSTEMS
IL184675A IL184675A0 (en) 2005-01-20 2007-07-17 Scheduling of housekeeping operations in flash memory systems

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US11/040,325 US20060161724A1 (en) 2005-01-20 2005-01-20 Scheduling of housekeeping operations in flash memory systems
US11/040,325 2005-01-20
US11/312,985 US7315917B2 (en) 2005-01-20 2005-12-19 Scheduling of housekeeping operations in flash memory systems
US11/312,985 2005-12-19

Publications (2)

Publication Number Publication Date
WO2006078531A2 WO2006078531A2 (en) 2006-07-27
WO2006078531A3 true WO2006078531A3 (en) 2006-11-23

Family

ID=36384406

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2006/001070 WO2006078531A2 (en) 2005-01-20 2006-01-11 Scheduling of housekeeping operations in flash memory systems

Country Status (9)

Country Link
US (3) US7315917B2 (en)
EP (2) EP1856616B1 (en)
JP (2) JP4362534B2 (en)
KR (1) KR101304254B1 (en)
AT (2) ATE499648T1 (en)
DE (2) DE602006020363D1 (en)
IL (1) IL184675A0 (en)
TW (1) TWI406295B (en)
WO (1) WO2006078531A2 (en)

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