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
Electronic device, communication control method of electronic device, and information terminal device
Phase noise extraction apparatus and technique
Integrated process for the manufacture of fluorinated olefins
Auto-aligning spectroscopy system
Communication device
Process for producing polyols
Solar-powered roadway light
  Randomly Featured Patents
Method and system for constructing a program including a navigation instruction
Circuit board having conductive shield member and semiconductor package using the same
Method for filtering gamma ray well logging tool response to enhance vertical detail while suppressing statistical noise
Tank truck with agitator for fluid products
Safety scissors
Shoe for sports involving running
Catheter steering mechanism
Wood waferizing apparatus
Asynchronous transfer mode integrated access service