Patents by Inventor Tatsuro MIYAKAWA

Tatsuro MIYAKAWA 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).

  • Method and system for power estimation based on a number of signal changes
    Patent number: 9021289
    Abstract: In a power estimator, a power coefficient-calculating section acquires an average value of the number of signal changes per unit time in each circuit range to thereby calculate a power coefficient for each circuit range or calculate a power coefficient for each circuit range when the average value of the number of signal changes per unit time is equal to 1, a correction coefficient-calculating section calculates a ratio of an average value of the number of signal changes per unit time at signal lines included in the circuit range to an average value of the number of signal changes per unit time at observing points designated in the circuit range, as a correction coefficient, and a power value-calculating section calculates a power value for each circuit range based on the correction coefficient and the power coefficient calculated for each circuit range.
    Type: Grant
    Filed: October 14, 2011
    Date of Patent: April 28, 2015
    Assignees: Fujitsu Limited, Fujitsu Semiconductor Limited
    Inventors: Takayuki Sasaki, Hirohisa Kotegawa, Takashi Tokue, Shigeru Satoh, Tatsuro Miyakawa, Ryuji Fujita, Junichi Niitsuma
  • POWER ESTIMATOR AND POWER ESTIMATION METHOD
    Publication number: 20120095737
    Abstract: In a power estimator, a power coefficient-calculating section acquires an average value of the number of signal changes per unit time in each circuit range to thereby calculate a power coefficient for each circuit range or calculate a power coefficient for each circuit range when the average value of the number of signal changes per unit time is equal to 1, a correction coefficient-calculating section calculates a ratio of an average value of the number of signal changes per unit time at signal lines included in the circuit range to an average value of the number of signal changes per unit time at observing points designated in the circuit range, as a correction coefficient, and a power value-calculating section calculates a power value for each circuit range based on the correction coefficient and the power coefficient calculated for each circuit range.
    Type: Application
    Filed: October 14, 2011
    Publication date: April 19, 2012
    Applicants: FUJITSU SEMICONDUCTOR LIMITED, FUJITSU LIMITED
    Inventors: Takayuki SASAKI, Hirohisa KOTEGAWA, Takashi TOKUE, Shigeru SATOH, Tatsuro MIYAKAWA, Ryuji FUJITA, Junichi NIITSUMA