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
Non-volatile flash-RAM memory with magnetic memory
Direct connect single layer touch panel
Multiple input multiple output transceiver
Combined high and low frequency stimulation therapy
Synchronous rectifier network unit circuit and method
Semiconductor thin film, thin film transistor, method for manufacturing same, and manufacturing equipment of semiconductor thin film
Visibility radio cap and network
  Randomly Featured Patents
Dynamically self-stabilizing elastic keyswitch
System and method to deterministically and dynamically prevent interference to the operation of safety-of-life radio equipment
Crosslinked protein crystal formulations and their use as catalysts in organic solvents
Polyolefin resin composition
Device for removing dust, lint and static charge from film and plastic surfaces
Indolyl-urea derivatives of thienopyridines useful as antiangiogenic agents, and methods for their use
Rotary hearth furnace and screw thereof for discharging reduced iron
Inbred maize line PHANF
Method for continuous magnetic ore separation and/or dressing and related system
Flexible guides for light energy