Apparatus and method for detecting over-programming condition in

Details Apparatus and method for detecting over-programming condition in Apparatus and method for detecting over-programming condition in

1996-10-24

1998-06-23

Beausoliel, Jr., Robert W.

Static information storage and retrieval

Magnetic bubbles

Guide structure

36518522, G11C 2900, G11C 1134

Patent

active

057713464

ABSTRACT:
An apparatus and method for detecting an over-programming condition in a multistate memory cell. The invention is also directed to identifying the over-programmed cells and providing an alternate location at which to write the data intended for the over-programmed cell. An over-programmed state detection circuit generates an error signal when the data contained in a multistate memory cell is found to be over-programmed relative to its intended programming (threshold voltage level) state. Upon detection of an over-programmed cell, the programming operation of the memory system is modified to discontinue further programming attempts on the cell. The over-programmed state detection circuit is also used to assist in correcting for the over-programming state, permitting the programming error to be compensated for by the memory system.

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