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
Patient interface
Optical switching device and communications system
Para-xylylene based microfilm elution devices
Methods and compositions for improving photodynamic therapy through administration of lipids
Wireless refrigerant scale platform
Profiling activity through video surveillance
Method for transitioning between Ziegler-Natta and metallocene catalysts in a bulk loop reactor for the production of polypropylene
  Randomly Featured Patents
Fishing jig
Sighting assembly
Side pack
Circuit of SDRAM and method for data communication
Ion exchange assembly for an electrochemical cell
Lantana plant named `Robpatche`
Forearm/wrist/mouse support system
Methods of forming NAND cell units
Drive apparatus for vibrating-type compressor
Synchronizing image pickup process of a plurality of image pickup apparatuses