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
Implicit certificate scheme
Fuel cell module, manufacturing method thereof and unit containing several of the latter
Method for drug screening and characterization by calcium flux
Approaching object detection system
Off-line converter with digital control
Electromagnetic sensor cable and electrical configuration therefor
Mobile device case with storage compartment
  Randomly Featured Patents
Non-contact rotational position sensor and throttle valve assembly including non-contact rotational position sensor
Rare earth metal-cobalt permanent magnet alloy
1-hydrocarbyloxy-piperidine compounds containing silane groups for use as stabilizers for organic materials
Current limiting circuit breaker contact arm configuration
Pole mounted sign support clamp
Noncircular fiber battery separator and method
Bearingless generator and rotary machine combination
Sintering tray
Editing support system including an interactive interface