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
Filler containing composition and process for production and use thereof
Imaging device and imaging method
Method for transforming a single reactor line
Hepatitis C virus inhibitors
Touch-sensitive device and communication device
Mesa-shaped piezoelectric resonator element
Electrode composition with enhanced performance characteristics
  Randomly Featured Patents
Compact high performance zoom lens system
Button telephone apparatus and internet communication system
Hydraulically powered vehicle, and engine rotational speed control method for hydraulically powered vehicle
Mobile unit for applying fluids on large surfaces, in particular floor surfaces
Process for the desulfurization of carbonaceous fuels with aqueous caustic and oxygen
Electrostatographic photoreceptor
Fluid ejecting apparatus and method of controlling the fluid ejecting apparatus
System and method for controlling the elevation of a boom hoist device
Elevator belt for an elevator installation and method of producing such an elevator belt
Method comprising nanofiltration to obtain an MBL product safe from infectious agents and the product obtainable by this method