Patents by Inventor Chingshun Cheng

Chingshun Cheng has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Address sensitive memory testing
    Patent number: 5357521
    Abstract: A method for testing directly addressable memory in a computer system uses address sensitive test data. When a memory error occurs, or when an initial testing of the memory indicates an error, the affected locations are retested with selected address sensitive memory test patterns. Proper address sensitive pattern selection allows all of the data bits, ECC data bits and address parity bits to be tested.
    Type: Grant
    Filed: March 10, 1993
    Date of Patent: October 18, 1994
    Assignee: International Business Machines Corporation
    Inventors: Chingshun Cheng, Paul J. Roy
  • Background memory test during system start up
    Patent number: 5155844
    Abstract: A system and method is provided for testing a computer system main memory during system startup. An initial block of memory is tested and marked as valid or invalid during a startup sequence, with the remaining system memory initially marked as bad. An operating system and applications can be loaded into the initial block and operate normally, and a concurrent process is invoked to test the remaining system memory. This allows the remaining system memory to be tested and marked as valid during normal system operation.
    Type: Grant
    Filed: February 14, 1990
    Date of Patent: October 13, 1992
    Assignee: International Business Machines Corporation
    Inventors: Chingshun Cheng, Scott L. Porter, William C. Richardson, Paul J. Roy