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
Code reading apparatus, sales registering apparatus, and sales registering method
Minimizing mismatch during compensation
Methods and systems providing desktop search capability to software application
Method and device for reliable estimation of network traffic
Measuring apparatus for measuring a physical property of a sample
Automatic fixup of network configuration on system image move
Circuit design approximation
  Randomly Featured Patents
Security assembly and method of controlling a security assembly
Securing device for an intake tube of an internal combustion engine
Virtual image projector
Automatic identification of medical staff training needs
Brake shoe spring installer and method of use
Fiber optic image transfer assembly and method of using
Electroacoustic system
Multiple global pattern history tables for branch prediction in a microprocessor
Paper makers wet felts
Volatile dispenser