Nonvolatile semiconductor storage apparatus and method of...

Details Nonvolatile semiconductor storage apparatus and method of... Nonvolatile semiconductor storage apparatus and method of...

2008-03-04

2008-03-04

Tran, Michael T (Department: 2827)

Static information storage and retrieval

Floating gate

Particular connection

C365S185240

Reexamination Certificate

active

07339823

ABSTRACT:
A memory cell array is logically divided into a plurality of regions having different reading speeds, the respective regions having the different reading speeds include region information storage regions for storing region information in which at least two addresses present in the memory cell at the same time are set to be different regions, a reading control circuit is constituted to carry out a reading operation by determining any of the divided regions which is to be read, selecting an optimum reading method and controlling the reading circuit based on the region information stored in the region information storage region, and an address which can be read in a short time in multivalued information stored in one memory cell is set to be a high speed reading region and is distinguished from regions having the other reading speeds. Consequently, it is possible to efficiently write and read information of 2 bits or more in one memory cell array without reducing a using efficiency of the memory cell array.

REFERENCES:
patent: 6307398 (2001-10-01), Merritt et al.
patent: 6421754 (2002-07-01), Kau et al.
patent: 6606269 (2003-08-01), Roohparvar
patent: 2005/0083772 (2005-04-01), Roohparvar et al.
patent: 2005/0122803 (2005-06-01), Yamada et al.
patent: 2001-210082 (2001-03-01), None

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