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Memory system, program method thereof, and computing system including the same

  • US 9,275,742 B2
  • Filed: 09/19/2014
  • Issued: 03/01/2016
  • Est. Priority Date: 04/30/2007
  • Status: Active Grant
First Claim
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1. A method of programming a multi-bit flash memory device which includes memory cells, each memory cell configured to store one or more data including at least either a lower page and or an upper page, the method comprising:

  • storing an LSB data of the lower page in a selected memory cell;

    if data to be stored is assigned to the upper page in the selected memory cell, backing up the lower page data stored already in the selected memory cell to a backup memory block in the multi-bit flash memory device; and

    copying the lower page data backed up in the backup memory block to a free memory block in the multi-bit flash memory device after a power failure to a memory block including the selected memory cell is detected,wherein the free block is different from the memory block including the selected memory cell.

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