NandFlash bad block management method

A bad block and block number technology, applied in the field of NandFlash bad block management, can solve the problems of increased memory capacity and large memory, and achieve the effects of strong adaptability, high production efficiency and strong versatility
CN102929795AActive Publication Date: 2013-02-13FEITIAN TECHNOLOGIES
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
FEITIAN TECHNOLOGIES
Publication Date
2013-02-13

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Abstract

The invention discloses a NandFlash bad block management method and belongs to the field of memories. The method comprises the following steps of: performing initial bad block scanning, looking for a substitutive block for the scanned bad block, generating corresponding record and writing the record in a bad block substitution region, creating a bitmap list after the initial bad block scanning, performing bitmap marking on the record in the bad block substitution region, judging whether the block related in the operation request is bad block according to the mark in the bitmap when receiving a block operation request, if so, looking for the substitutive block of the bad block and operating the substitutive block, if not, operating the current block, adding or amending the record in the bad block record if the bad block appears during the operation process, and adding the mark of the new bad block in the bitmap list. The NandFlash bad block management method has the beneficial effects of supporting high capacity NandFlash chips under the condition of occupying small internal memory and improving the access speed of the NandFlash chips.
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Description

technical field

[0001] The invention belongs to the field of memory, in particular to a NandFlash bad block management method. Background technique

[0002] NandFlash is a kind of Flash memory, which uses a non-linear macro-cell mode inside, which provides a cheap and effective solution for the realization of solid-state large-capacity memory. NandFlash memory has the advantages of large capacity and fast rewriting speed, and is suitable for the storage of large amounts of data, so it has been more and more widely used in the industry, such as embedded products including digital cameras, MP3 walkman memory cards, small and exquisite U disk, etc.

[0003] NandFlash has the possibility of bad blocks when it is used for the first time, and bad blocks will also be generated during use. Currently, the method of establishing a mapping table is used to manage bad blocks of NandFlash.

[0004] The inventor found in the process of realizing the present invention that at least the f...

Claims

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