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Flash eeprom system

  • US 5,297,148 A
  • Filed: 10/20/1992
  • Issued: 03/22/1994
  • 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, comprisingan array of electrically Erasable and Programmable Read Only Memory ("EEPROM") cells partitioned into a plurality of flash sectors,each flash sector being a group of cells that are erasable together as a unit, and having a portion thereof reserved as redundant cells;

  • anda memory controller for controlling operations of the EEPROM cells,error detection means within said memory controller for detecting any defective cells within the array;

    defect pointers, each generated by said memory controller for linking a detected defective cell'"'"'s address to that of a corresponding redundant cell substituting for the defective cells, said defect pointer being stored within the array; and

    defective cell substituting means within said memory controller and responsive to said defect pointers for substituting said detected defective cell with said corresponding redundant cells.

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