Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
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
Sunglasses
Controlling transmission resources in mobile radio systems with dualtransfer mode
Ion generation using wetted porous material
Compositions and methods for lowering triglycerides in a subject on concomitant statin therapy
Efficient paging in a wireless communication system
Information processing apparatus, non-transitory computer-readable recording medium, and information processing method
Interleaving charge pumps for programmable memories
  Randomly Featured Patents
Ultrasonic processes and circuits for performing them
Glad hand seal
Computer controlled water bypass system for a marine engine
Surgical stapling apparatus
Mass and heat recovery system for a fuel cell power plant
Cooled refractory lined shaft furnace and stave-cooler to be used therefore
Blade structure for blender
Method and apparatus for accelerating a solid mass
Tissue processing for immunofluorescence microscopy
Claming device for shoelaces or similar fastener means