×

NONVOLATILE MEMORY DEVICE AND METHOD OF ERASING THE SAME

  • US 20120008412A1
  • Filed: 07/06/2011
  • Published: 01/12/2012
  • Est. Priority Date: 07/09/2010
  • Status: Abandoned Application
First Claim
Patent Images

1. A method of erasing a nonvolatile memory device, the method comprising the steps of:

  • supplying an erase voltage to a P well of a semiconductor substrate having a memory cell block disposed therein;

    performing a first erase verification operation for verifying an erase state of memory cells coupled to even bit lines of the memory cell block;

    making a determination of success or failure for the first erase verification operation; and

    if, as a result of the determination for the first erase verification operation, all the memory cells coupled to the even bit lines are determined to be erased, performing a second erase verification operation for verifying an erase state of memory cells coupled to odd bit lines of the memory cell block.

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