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
Modular utility rack
Integrated circuit packaging system with an integral-interposer-structure and method of manufacture thereof
Partial response decision feedback equalizer with distributed control
Case for a tablet computer
Solid state lighting devices with cellular arrays and associated methods of manufacturing
Microporous membranes and methods for producing and using such membranes
Chain link
  Randomly Featured Patents
Coding pattern with fragments of common data distributed in each tag
Tape guide for tensioning tape and regulating the running thereof in a small or mini-cassette
Bonus game for gaming machine providing player with deal or no deal options
Filtration system for collecting and filtering particles and fumes from ablative imaging plates
Structure for mounting hydraulic hoses for a power loader
Trash bag holding device
Wireless local area network processing device having multiple parallel radios
Internal combustion engine for a snowmobile
Method and apparatus for enabling services and media in a communication network
Roto-track display device