×

NONVOLATILE MEMORY DEVICE AND METHODS OF PROGRAMMING AND READING THE SAME

  • US 20080310234A1
  • Filed: 06/10/2008
  • Published: 12/18/2008
  • Est. Priority Date: 06/14/2007
  • Status: Active Grant
First Claim
Patent Images

1. A read method of a non-volatile memory device, comprising:

  • reading an initial threshold voltage value of an index cell from threshold voltage information cells that store information indicating the initial threshold voltage;

    reading a current threshold voltage value from the index cell;

    comparing the initial threshold voltage value and the current threshold voltage value to calculate a shifted threshold voltage level of the index cell; and

    changing a read voltage by the shifted threshold voltage level to read user data using the changed read voltage.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×