Patents by Inventor Hiyori Koyama

Hiyori Koyama 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).

  • Nonvolatile memory device
    Patent number: 6829178
    Abstract: A counter circuit for counting the number of fails generated during the write and erase processes executed in the predetermined unit such as a sector and a comparison circuit for judging whether the value counted with the counter circuit has exceeded or not the preset allowable value for the number of fails are provided. Accordingly, when the counted value of the counter circuit has exceeded the allowable value set to a register, the write process or erase process is not performed even when a write or erase command is inputted from an external circuit. Thereby, the required test time can be shortened for the electrically programmable and erasable nonvolatile semiconductor memory device such as a flash memory.
    Type: Grant
    Filed: October 15, 2002
    Date of Patent: December 7, 2004
    Assignees: Renesas Technology Corp., Hitachi ULSI Systems Co., Ltd.
    Inventors: Hiyori Koyama, Kazuyoshi Oshima, Akihiko Hoshida, Kiichi Manita, Michitaro Kanamitsu, Shinji Udo, Kazue Kikuchi, Kazuaki Ujiie, Masahiro Sakai
  • Nonvolatile memory device
    Publication number: 20030107918
    Abstract: A counter circuit for counting the number of fails generated during the write and erase processes executed in the predetermined unit such as a sector and a comparison circuit for judging whether the value counted with the counter circuit has exceeded or not the preset allowable value for the number of fails are provided. Accordingly, when the counted value of the counter circuit has exceeded the allowable value set to a register, the write process or erase process is not performed even when a write or erase command is inputted from an external circuit. Thereby, the required test time can be shortened for the electrically programmable and erasable nonvolatile semiconductor memory device such as a flash memory.
    Type: Application
    Filed: October 15, 2002
    Publication date: June 12, 2003
    Applicants: Hitachi, Ltd., Hitachi ULSI Systems Co., Ltd.
    Inventors: Hiyori Koyama, Kazuyoshi Oshima, Akihiko Hoshida, Kiichi Manita, Michitaro Kanamitsu, Shinji Udo, Kazue Kikuchi, Kazuaki Ujiie, Masahiro Sakai