Patents by Inventor Mio MARUMOTO

Mio MARUMOTO 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).

  • Semiconductor device performing self refresh operation
    Patent number: 8767497
    Abstract: When refresh activation signals (REFACT0 to REFACT3) are supplied, the internal memory cells in two or more memory banks (0 to 3) are refreshed. A refresh control circuit performs a first refresh control operation to activate a refresh operation in all of the memory banks when an auto refresh command is supplied, and performs a second refresh control operation to activate a refresh operation in a part of the memory banks when a self refresh command is supplied.
    Type: Grant
    Filed: June 1, 2012
    Date of Patent: July 1, 2014
    Inventors: Mio Marumoto, Sachiko Edo
  • SEMICONDUCTOR DEVICE PERFORMING SELF REFRESH OPERATION
    Publication number: 20120307582
    Abstract: When refresh activation signals (REFACT0 to REFACT3) are supplied, the internal memory cells in two or more memory banks (0 to 3) are refreshed. A refresh control circuit performs a first refresh control operation to activate a refresh operation in all of the memory banks when an auto refresh command is supplied, and performs a second refresh control operation to activate a refresh operation in a part of the memory banks when a self refresh command is supplied.
    Type: Application
    Filed: June 1, 2012
    Publication date: December 6, 2012
    Inventors: Mio MARUMOTO, Sachiko Edo