Nonvolatile semiconductor storage device

Details Nonvolatile semiconductor storage device Nonvolatile semiconductor storage device

2008-11-17

2010-11-30

Nguyen, VanThu (Department: 2824)

Static information storage and retrieval

Floating gate

Multiple values

C365S185090, C365S185120, C365S185200

Reexamination Certificate

active

07843728

ABSTRACT:
A nonvolatile semiconductor storage device capable of storing a plurality of bits of data in one memory cell by assigning multivalued data having a higher-order bit selected from one of a pair of data in a first unit and a lower-order bit selected from the other of the pair of data to each threshold voltage of the memory cell, wherein in a first write operation that processes data in the first unit, the logic of one of the higher-order bit and the lower-order bit is fixed, and two pieces of multivalued data that maximize the difference between the threshold voltages are assigned, thereby storing one bit of input data in the one memory cell in a pseudo binary state, and in a second write operation that processes data in a second unit larger than the first unit, a plurality of bits of input data is stored in the one memory cell in a multivalued state, and parity data for error correction in the second unit is stored in the memory cell.

REFERENCES:
patent: 6801468 (2004-10-01), Lee
patent: 2006/0181934 (2006-08-01), Shappir et al.
patent: 2001-210082 (2001-08-01), None
patent: 2005-108303 (2005-04-01), None

Affiliated with

Also associated with

Rating

Nonvolatile semiconductor storage device does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Nonvolatile semiconductor storage device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Nonvolatile semiconductor storage device will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4203066