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
Active Publication Date: 2013-02-13
FEITIAN TECHNOLOGIES
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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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