Patents by Inventor Frank Tsang

Frank Tsang 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).

  • Patent number: 6934921
    Abstract: Resolving timing violations introduced by a logic built-in self test (LBIST) sub-circuit formed within an underlying integrated circuit includes analyzing a circuit path-list corresponding to the integrated circuit for timing violations and generating a circuit timing violations analysis output; generating a first LBIST/circuit path-list based on the circuit path-list and an LBIST path-list corresponding to the LBIST sub-circuit; analyzing the first LBIST/circuit path-list for timing violations and generating an LBIST/circuit timing violations analysis output; comparing the LBIST/circuit timing violations analysis output with the circuit timing violations analysis output; generating an LBIST/circuit constraint file based on the comparison and predetermined protocols; and generating a second LBIST/circuit path-list based on the circuit path-list, the LBIST path-list and the constraints file. In this way, timing problems are quickly and efficiently resolved.
    Type: Grant
    Filed: January 4, 2002
    Date of Patent: August 23, 2005
    Assignee: Cisco Technology, Inc.
    Inventors: Xinli Gu, Sung Soo Chung, Frank Tsang