Patents Represented by Attorney Davis Wright Tremairne LLP
  • Patent number: 7848149
    Abstract: Storage elements are read multiple times and the results are accumulated and averaged for each storage element to reduce the effects of noise or other transients in the storage elements and associated circuits that may adversely affect the quality of the read. Several techniques may be employed, including: A full read and transfer of the data from the storage device to the controller device for each iteration, with averaging performed by the controller; a full read of the data for each iteration, with the averaging performed by the storage device, and no transfer to the controller until the final results are obtained; one full read followed by a number of faster re-reads exploiting the already established state information to avoid a full read, followed by an intelligent algorithm to guide the state at which the storage element is sensed. These techniques may be used as the normal mode of operation, or invoked upon exception condition, depending on the system characteristics.
    Type: Grant
    Filed: February 12, 2007
    Date of Patent: December 7, 2010
    Assignee: SanDisk Corporation
    Inventors: Carlos J. Gonzalez, Daniel C. Guterman