Patents by Inventor Kunimitsu Itashiki

Kunimitsu Itashiki 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: 8074096
    Abstract: Aspects of the embodiment provide a semiconductor integrated circuit including a control terminal coupled to a memory through a control bus, a data terminal coupled to the memory through a data bus, a memory controller coupled to the control terminal and the data terminal and a first master and a second master coupled to the memory controller, wherein the memory controller supplies a control signal corresponding to a memory access based on the first master and a control signal corresponding to a memory access based on the second master to the control terminal in synchronism with a rising edge and a falling edge of a clock signal, respectively, and the memory controller receives and outputs input/output data of the first master and input/output data of the second master at the data terminal in synchronism with the rising edge and the falling edge, respectively.
    Type: Grant
    Filed: March 17, 2008
    Date of Patent: December 6, 2011
    Assignee: Fujitsu Semiconductor Limited
    Inventors: Masami Kanasugi, Koichi Kuroiwa, Makoto Muranushi, Koji Nozoe, Kunimitsu Itashiki
  • Publication number: 20080229135
    Abstract: Aspects of the embodiment provide a semiconductor integrated circuit including a control terminal coupled to a memory through a control bus, a data terminal coupled to the memory through a data bus, a memory controller coupled to the control terminal and the data terminal and a first master and a second master coupled to the memory controller, wherein the memory controller supplies a control signal corresponding to a memory access based on the first master and a control signal corresponding to a memory access based on the second master to the control terminal in synchronism with a rising edge and a falling edge of a clock signal, respectively, and the memory controller receives and outputs input/output data of the first master and input/output data of the second master at the data terminal in synchronism with the rising edge and the falling edge, respectively.
    Type: Application
    Filed: March 17, 2008
    Publication date: September 18, 2008
    Applicant: FUJITSU LIMITED
    Inventors: Masami KANASUGI, Koichi Kuroiwa, Makoto Muranushi, Koji Nozoe, Kunimitsu Itashiki
  • Patent number: 7174484
    Abstract: A data transmission system which provides a better level of transmission quality, without being affected by skew variations. A serial-to-parallel converter reforms a serial data stream into a set of parallel data streams. A sync pattern inserter generates and inserts sync patterns to the parallel data streams. The resultant sync pattern-inclusive data streams are, however, distorted with some propagation delay skews when they arrive at the receiving end. A data retimer extracts a reference clock from one of the received data streams, and retimes all streams with that reference clock, thus producing a set of retimed data streams. An in-sync detector produces pulse signals indicating the presence of sync patterns in the retimed data streams and determines whether each of those streams is in in-sync state. A phase adjuster identifies the propagation delay skews by examining the pulse signals, and adjusts the phase of each data stream to eliminate them.
    Type: Grant
    Filed: November 14, 2002
    Date of Patent: February 6, 2007
    Assignee: Fujitsu Limited
    Inventors: Hiroyuki Shimono, Kunimitsu Itashiki, Teruhiko Suzuki, Shuji Miyake
  • Publication number: 20030131301
    Abstract: A data transmission system which provides a better level of transmission quality, without being affected by skew variations. A serial-to-parallel converter reforms a serial data stream into a set of parallel data streams. A sync pattern inserter generates and inserts sync patterns to the parallel data streams. The resultant sync pattern-inclusive data streams are, however, distorted with some propagation delay skews when they arrive at the receiving end. A data retimer extracts a reference clock from one of the received data streams, and retimes all streams with that reference clock, thus producing a set of retimed data streams. An in-sync detector produces pulse signals indicating the presence of sync patterns in the retimed data streams and determines whether each of those streams is in in-sync state. A phase adjuster identifies the propagation delay skews by examining the pulse signals, and adjusts the phase of each data stream to eliminate them.
    Type: Application
    Filed: November 14, 2002
    Publication date: July 10, 2003
    Inventors: Hiroyuki Shimono, Kunimitsu Itashiki, Teruhiko Suzuki, Shuji Miyake