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Identification and operation of sub-prime blocks in nonvolatile memory

  • US 9,501,400 B2
  • Filed: 11/13/2013
  • Issued: 11/22/2016
  • Est. Priority Date: 11/13/2013
  • Status: Active Grant
First Claim
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1. A method of operating blocks of a memory array comprising:

  • categorizing the blocks into a plurality of categories including prime blocks, sub-prime blocks, and bad blocks;

    wherein the categorizing includes identifying a bad block from test results obtained from the bad block, and subsequently identifying sub-prime blocks based on their proximity to the bad block;

    subsequently selecting individual blocks in different planes for parallel operation in metablocks such that each block in a metablock is selected from the same category;

    configuring metablocks formed from prime blocks as prime metablocks that are operated in a first manner; and

    configuring metablocks formed from sub-prime blocks as sub-prime metablocks that are operated in a second manner that is different from the first manner.

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