METHOD AND APPARATUS FOR MANAGING UNUSABLE BLOCK IN NONVOLATILE MEMORY SYSTEM, IN WHICH A DEFECTIVE BLOCK IS USED AS A SPARE BLOCK

PURPOSE: A method and an apparatus for managing an unusable block in a nonvolatile memory system are provided to enable to use a potentially usable block identified as a defective block as a spare block. CONSTITUTION: An erase count block(300) includes a specific number of bits as to a physical bloc...

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Bibliographic Details
Main Authors CHANG ROBERT C, SABET SHARGHI FARSHID, QAWAMI BAHMAN
Format Patent
LanguageEnglish
Korean
Published 08.05.2004
Edition7
Subjects
CALCULATING
COMPUTING
COUNTING
ELECTRIC DIGITAL DATA PROCESSING
INFORMATION STORAGE
MEASURING
MEASURING ELECTRIC VARIABLES
MEASURING MAGNETIC VARIABLES
PHYSICS
STATIC STORES
TESTING
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Summary:PURPOSE: A method and an apparatus for managing an unusable block in a nonvolatile memory system are provided to enable to use a potentially usable block identified as a defective block as a spare block. CONSTITUTION: An erase count block(300) includes a specific number of bits as to a physical block in the whole nonvolatile system. The erase count block includes a page including almost 512 bytes which are used in storing data like erase count. The first page(310a) is arranged to include erase count entry as to block '0' or block '169', and the second page(310b) is arranged to include erase count entry as to block '170' or block '339'. When erase count as to a physical block '1' is recorded or read, 3 or 5 bytes of the first page are accessed. The erase count block also includes a header(320) which is located between pages(310c,310d).
Bibliography:Application Number: KR20030075158