Resources Contact Us Home
Set of three level concurrent word line bias conditions for a nor type flash memory array

Image Number 19 for United States Patent #6620682.

In the present invention a method is shown that uses three concurrent word line voltages in memory cell operations of an a NOR type EEPROM flash memory array. A first concurrent word line voltage controls the operation on a selected word line within a selected memory block. The second concurrent word line voltage inhibits cells on non selected word lines in the selected memory block, and the third concurrent word line voltage inhibits non-selected cells in non-selected blocks from disturb conditions. In addition the three consecutive word line voltages allow a block to be erased, pages within the block to be verified as erased, and pages within the block to be inhibited from further erasure. The three consecutive voltages also allow for the detection of over erasure of cells, correction on a page basis, and verification that the threshold voltage of the corrected cells are above an over erase value but below an erased value. The methods described herein produce a cell threshold voltage that has a narrow voltage distribution.

  Recently Added Patents
Amnion-derived cells, methods of making and uses thereof
Technique for manufacturing bit patterned media
Incrementally increasing deployment of gateways
Method for generating multi-antenna signals
Multiplexing channels by a medium access controller
Simplifying lexicon creation in hybrid duplicate detection and inductive classifier systems
PLL circuit
  Randomly Featured Patents
Aminobenzophenones and photopolymerizable compositions including the same
Apparatus for making tubular containers
Phototherapy device and method
System and method for the assembly of programs
Process for preparing halogenated compounds
Residual thread chain back tacking device for overlock stitch machines
Hydrocarbon reservoir testing
Hybrid stent
Apparatus for a status reporting device for container handler
Protective cover for electrical assembly unit