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Non-volatile memory system card with flash erasable sectors of EEprom cells including a mechanism for substituting defective cells

  • US 5,535,328 A
  • Filed: 02/23/1995
  • Issued: 07/09/1996
  • Est. Priority Date: 04/13/1989
  • Status: Expired due to Term
First Claim
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1. A memory card connectable to a computer system, said memory card comprising:

  • an array of non-volatile floating gate memory cells partitioned into a plurality of sectors that individually include a distinct group of said array of memory cells that are erasable together as a unit, the individual sectors including a user data portion and a spare portion of the group of memory cells,a memory controller for controlling operation of the memory cell array and interfacing the memory cell array with the computer system,means within said memory controller for identifying defective cells within the user data portion of individual ones of said plurality of sectors, andmeans including said memory controller and responsive to detection of a defective cell within the user data portion of one of said plurality of sectors for substituting therefore a corresponding redundant cell within the spare portion of said one of said plurality of sectors.

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