Resources Contact Us Home
Method and apparatus for redundancy word line replacement in a repairable semiconductor memory device

Image Number 10 for United States Patent #5963489.

A method and apparatus for repairing a semiconductor memory device. A row redundancy replacement arrangement is provided to repair the memory device consisting of a first plurality of redundant true word lines and a second plurality of redundant complement word lines to simultaneously replace the same first number of first normal word lines and the same second number of the normal complement word lines. An address reordering scheme, preferably implemented as a word line selector circuit and controlled by redundancy control logic and address inputs, allows the redundant true (complement) word lines to replace the normal true (complement) word lines when making the repair. The redundancy replacement arrangement ensures that consistency of the bit map is maintained at all times, irrespective whether the memory device operates in a normal or in a redundancy mode. This approach introduces an added flexibility of incorporating the redundancy replacement without affecting the column access speed.

  Recently Added Patents
Self-diagnostic method and system for implantable cardiac device
Press nut
People engine optimization
Apparatus and methods for inventory, sale, and delivery of digitally transferable goods
Method and system for reciprocal mixing cancellation of wideband modulated blockers
Pet grooming brush and vacuum attachment
Method and an apparatus for processing an audio signal
  Randomly Featured Patents
Method and apparatus for identifying a waveform period
Method of manufacturing a semiconductor integrated circuit device
Method and apparatus for displaying resource information
Rear compartment arrangements for van type motor vehicle
Depilatory device
Highly efficient line transient protection circuit for high power loads
Chiral indole intermediates and their fluorescent cyanine dyes containing functional groups
Heat transfer systems
Electromagnetic fuel injector nozzle assembly
Efficient non-blocking k-compare-single-swap operation