Patents by Inventor Naoki Ninagawa

Naoki Ninagawa 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).

  • Avoidance of extended bus occupancy through simple control operation
    Patent number: 7181558
    Abstract: A shared bus system includes a bus, a first circuit which accesses the bus, a second circuit which shares the bus with the first circuit, and accesses the bus, a counter circuit which is provided in the second circuit, and performs a counting operation each time the second circuit accesses the bus, and an arbiter circuit which arbitrates requests for a right to use the bus between the first circuit and the second circuit, wherein the second circuit releases the right to use the bus in response to detection of a predetermined number of counting operations performed by the counter circuit after acquiring the right to use the bus from the arbiter circuit.
    Type: Grant
    Filed: November 21, 2003
    Date of Patent: February 20, 2007
    Assignee: Fujitsu Limited
    Inventors: Yoichi Endo, Naoki Ninagawa
  • Avoidance of extended bus occupancy through simple control operation
    Publication number: 20040117530
    Abstract: A shared bus system includes a bus, a first circuit which accesses the bus, a second circuit which shares the bus with the first circuit, and accesses the bus, a counter circuit which is provided in the second circuit, and performs a counting operation each time the second circuit accesses the bus, and an arbiter circuit which arbitrates requests for a right to use the bus between the first circuit and the second circuit, wherein the second circuit releases the right to use the bus in response to detection of a predetermined number of counting operations performed by the counter circuit after acquiring the right to use the bus from the arbiter circuit.
    Type: Application
    Filed: November 21, 2003
    Publication date: June 17, 2004
    Applicant: Fujitsu Limited
    Inventors: Yoichi Endo, Naoki Ninagawa