Patents by Inventor Shigeo Ohshima

Shigeo Ohshima 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: 8179730
    Abstract: A semiconductor device, a semiconductor memory tester, and a multi-chip package are provided. The semiconductor device includes a plurality of nonvolatile semiconductor memories; a boosting circuit which generates a boosted voltage for operating the plurality of nonvolatile semiconductor memories; and a boosting circuit controller which controls the operation of the boosting circuit to generate the boosted voltage on the basis of an operation sequence of the plurality of nonvolatile semiconductor memories.
    Type: Grant
    Filed: December 8, 2010
    Date of Patent: May 15, 2012
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yuui Shimizu, Shigeo Ohshima, Mie Matsuo
  • Patent number: 8000155
    Abstract: The present invention provides a method for writing data to a non-volatile memory device having first wirings and second wirings intersecting one another and memory cells arranged at each intersection therebetween, each of the memory cells having a variable resistive element and a rectifying element connected in series. According to the method, the second wirings are charged to a certain voltage not less than a rectifying-element threshold value, prior to a rise in a selected first wiring. Then, a selected first wiring is charged to a voltage required for writing or erasing, after which a selected second wiring is discharged.
    Type: Grant
    Filed: January 13, 2011
    Date of Patent: August 16, 2011
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Toshiaki Edahiro, Kazushige Kanda, Naoya Tokiwa, Takuya Futatsuyama, Koji Hosono, Shigeo Ohshima
  • Patent number: 7986557
    Abstract: A memory may include word lines; bit lines; cells provided corresponding to intersections between the word lines and the bit lines; sense amplifiers detecting data; a column decoder selecting a certain bit line for the sense amplifiers to output read data or receive write data; a row decoder configured to select a certain word line; a charge pump supplying power to the sense amplifiers, the column decoder, and the row decoder; a logic circuit controlling the sense amplifiers, the column decoder, and the row decoder based on an address selecting the memory cells; a first power source input applying a voltage to the logic circuit; and a second power source input applying a voltage higher than a voltage of the first power source input to the charge pump, and to supply power to the charge pump at least at a data reading time and a data writing time.
    Type: Grant
    Filed: July 31, 2009
    Date of Patent: July 26, 2011
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Naoya Tokiwa, Shigeo Ohshima
  • Publication number: 20110103135
    Abstract: The present invention provides a method for writing data to a non-volatile memory device having first wirings and second wirings intersecting one another and memory cells arranged at each intersection therebetween, each of the memory cells having a variable resistive element and a rectifying element connected in series. According to the method, the second wirings are charged to a certain voltage not less than a rectifying-element threshold value, prior to a rise in a selected first wiring. Then, a selected first wiring is charged to a voltage required for writing or erasing, after which a selected second wiring is discharged.
    Type: Application
    Filed: January 13, 2011
    Publication date: May 5, 2011
    Applicant: Kabushiki Kaisha Toshiba
    Inventors: Toshiaki EDAHIRO, Kazushige Kanda, Naoya Tokiwa, Takuya Futatsuyama, Koji Hosono, Shigeo Ohshima
  • Publication number: 20110074494
    Abstract: A semiconductor device, a semiconductor memory tester, and a multi-chip package are provided. The semiconductor device includes a plurality of nonvolatile semiconductor memories; a boosting circuit which generates a boosted voltage for operating the plurality of nonvolatile semiconductor memories; and a boosting circuit controller which controls the operation of the boosting circuit to generate the boosted voltage on the basis of an operation sequence of the plurality of nonvolatile semiconductor memories.
    Type: Application
    Filed: December 8, 2010
    Publication date: March 31, 2011
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Yuui Shimizu, Shigeo Ohshima, Mie Matsuo
  • Patent number: 7911823
    Abstract: A method of programming a non-volatile memory device with memory cells formed of variable resistance elements and disposed between word lines and bit lines, includes: previously charging a selected word line and a selected bit line together with a non-selected word line and a non-selected bit line up to a certain voltage; and further charging the selected word line and the non-selected bit line up to a program voltage higher than the certain voltage and a program-block voltage, respectively, and simultaneously discharging the selected bit line.
    Type: Grant
    Filed: May 20, 2008
    Date of Patent: March 22, 2011
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Takuya Futatsuyama, Koji Hosono, Toshiaki Edahiro, Naoya Tokiwa, Kazushige Kanda, Shigeo Ohshima
  • Patent number: 7889537
    Abstract: The present invention provides a method for writing data to a non-volatile memory device having first wirings and second wirings intersecting one another and memory cells arranged at each intersection therebetween, each of the memory cells having a variable resistive element and a rectifying element connected in series. According to the method, the second wirings are charged to a certain voltage not less than a rectifying-element threshold value, prior to a rise in a selected first wiring. Then, a selected first wiring is charged to a voltage required for writing or erasing, after which a selected second wiring is discharged.
    Type: Grant
    Filed: May 9, 2008
    Date of Patent: February 15, 2011
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Toshiaki Edahiro, Kazushige Kanda, Naoya Tokiwa, Takuya Futatsuyama, Koji Hosono, Shigeo Ohshima
  • Patent number: 7869240
    Abstract: A semiconductor device, a semiconductor memory tester, and a multi-chip package are provided. The semiconductor device includes a plurality of nonvolatile semiconductor memories; a boosting circuit which generates a boosted voltage for operating the plurality of nonvolatile semiconductor memories; and a boosting circuit controller which controls the operation of the boosting circuit to generate the boosted voltage on the basis of an operation sequence of the plurality of nonvolatile semiconductor memories.
    Type: Grant
    Filed: June 19, 2008
    Date of Patent: January 11, 2011
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yuui Shimizu, Shigeo Ohshima, Mie Matsuo
  • Patent number: 7823105
    Abstract: A layout-data generation equipment includes a logic circuit designing section which designs a logic circuit based on information of the specifications of a semiconductor integrated circuit, a layout-data generation section which creates layout-data based on the logic circuit, a resistance information extraction section which extracts resistance information of a wire from the layout-data, a circuit simulation execution section which executes a circuit simulation, an identification section of current direction which identifies a direction of a current in the wire based on the resistance information of a wire and an execution result of the circuit simulation, a verification section which verifies whether layout-data of the wire breaks a design rule, the design rule being extracted from the information of the specifications of a semiconductor integrated circuit and the verification section generates this verification result, and a data output section which outputs the layout-data.
    Type: Grant
    Filed: November 27, 2007
    Date of Patent: October 26, 2010
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Shigeo Ohshima, Kiminobu Suzuki, Kazuhiro Yamada, Takamichi Arizono
  • Patent number: 7817457
    Abstract: According to one embodiment, a nonvolatile memory device includes: a memory cell array including memory cells each having a variable resistance element for nonvolatilely storing data identified by an electrically rewritable resistance value; a first data latch storing write and erase data to be written on a given group of memory cells of the memory cell array for a write and erase operation; and a second data latch storing reference data for performing a compensation operation of the given group to compensate write and erase disturbance accompanied by the write or erase operation.
    Type: Grant
    Filed: June 4, 2008
    Date of Patent: October 19, 2010
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Naoya Tokiwa, Kazushige Kanda, Toshiaki Edahiro, Koji Hosono, Takuya Futatsuyama, Shigeo Ohshima
  • Patent number: 7800967
    Abstract: This disclosure concerns a memory including: word lines extending to a first direction; bit lines extending to a second direction crossing the first direction; a memory cell array including cell blocks each including memory cells respectively provided corresponding to intersection points of the word lines and the bit lines; and sense amplifiers provided corresponding to the bit lines, wherein the sense amplifiers copies existing data stored in a first cell block within the memory cell array to a plurality of memory cells, the memory cells being included in second and third cell blocks different from the first cell block, and alternately arranged in an extension direction of the word lines and also alternately arranged in an extension direction of the bit lines, and the sense amplifiers reads data from the second cell block or the third cell block, at a time of outputting data to outside of the sense amplifiers.
    Type: Grant
    Filed: November 28, 2008
    Date of Patent: September 21, 2010
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Satoru Takase, Shigeo Ohshima
  • Patent number: 7739634
    Abstract: The verification equipment of a semiconductor integrated circuit in the present invention is included with a circuit net list extraction section that extracts the net list of a circuit, a circuit simulation execution section that executes a circuit simulation, based on the extracted net list, a finite impedance judgment section that judges existence or nonexistence of finite impedances, a floating error terminal judgment section that judges existence or nonexistence of floating error terminals by measuring finite impedances, a true floating error terminal judgment section that adds any one of a P channel-type transistor and an N channel-type transistor to terminals of the circuit where it is judged that there are floating error terminals and calculates changes in potential at the terminals and adds the other of the P channel-type transistor and the N channel-type transistor to the terminals and calculates changes in potential at the terminals, and an output section that outputs a judgment result of the floati
    Type: Grant
    Filed: April 30, 2007
    Date of Patent: June 15, 2010
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Shigeo Ohshima, Kiminobu Suzuki
  • Patent number: 7732930
    Abstract: A semiconductor device including a circuit substrate including n number of terminals; a semiconductor chip provided on the circuit substrate and including n number of terminals; and a relay chip including a triangular substrate having a first side, a second side and a third side which form triangle, n number of first terminals located along the first side, n number of second terminals located along the second side, and a plurality of wires connecting the first terminals and the second terminals respectively; a first wire connecting each of the n number of terminals of the circuit substrate to a corresponding first terminal among the n number of first terminals; and a second wire connecting each of the n number of terminals of the semiconductor chip to a corresponding second terminal among the n number of second terminals.
    Type: Grant
    Filed: September 6, 2007
    Date of Patent: June 8, 2010
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Eiichi Makino, Shigeo Ohshima, Naohisa Okumura
  • Publication number: 20100027341
    Abstract: A memory may include word lines; bit lines; cells provided corresponding to intersections between the word lines and the bit lines; sense amplifiers detecting data; a column decoder selecting a certain bit line for the sense amplifiers to output read data or receive write data; a row decoder configured to select a certain word line; a charge pump supplying power to the sense amplifiers, the column decoder, and the row decoder; a logic circuit controlling the sense amplifiers, the column decoder, and the row decoder based on an address selecting the memory cells; a first power source input applying a voltage to the logic circuit; and a second power source input applying a voltage higher than a voltage of the first power source input to the charge pump, and to supply power to the charge pump at least at a data reading time and a data writing time.
    Type: Application
    Filed: July 31, 2009
    Publication date: February 4, 2010
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Naoya TOKIWA, Shigeo OHSHIMA
  • Patent number: 7602651
    Abstract: This disclosure concerns a device outputting data to the outside comprising a first transistor with a first conductive type which is connected between an output low voltage corresponding to a first logical value and the pad and which connects the output low voltage to the pad when the digital data has the first logical value; a second transistor with a second conductive type which is connected between an output high voltage corresponding to a second logical value and the pad and which connects the output high voltage to the pad when the digital data has the second logical value; and a third transistor with the first conductive type which is connected between the output high voltage and the pad so as to be parallel to the second transistor and which connects the output high voltage to the pad when the digital data has the second logical value.
    Type: Grant
    Filed: December 10, 2007
    Date of Patent: October 13, 2009
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Eiichi Makino, Shigeo Ohshima
  • Publication number: 20090175077
    Abstract: This disclosure concerns a memory including: word lines extending to a first direction; bit lines extending to a second direction crossing the first direction; a memory cell array including cell blocks each including memory cells respectively provided corresponding to intersection points of the word lines and the bit lines; and sense amplifiers provided corresponding to the bit lines, wherein the sense amplifiers copies existing data stored in a first cell block within the memory cell array to a plurality of memory cells, the memory cells being included in second and third cell blocks different from the first cell block, and alternately arranged in an extension direction of the word lines and also alternately arranged in an extension direction of the bit lines, and the sense amplifiers reads data from the second cell block or the third cell block, at a time of outputting data to outside of the sense amplifiers.
    Type: Application
    Filed: November 28, 2008
    Publication date: July 9, 2009
    Applicant: KABUSHIKI KAISHA THOSHIBA
    Inventors: Satoru TAKASE, Shigeo OHSHIMA
  • Publication number: 20090052227
    Abstract: The present invention provides a method for writing data to a non-volatile memory device having first wirings and second wirings intersecting one another and memory cells arranged at each intersection therebetween, each of the memory cells having a variable resistive element and a rectifying element connected in series. According to the method, the second wirings are charged to a certain voltage not less than a rectifying-element threshold value, prior to a rise in a selected first wiring. Then, a selected first wiring is charged to a voltage required for writing or erasing, after which a selected second wiring is discharged.
    Type: Application
    Filed: May 9, 2008
    Publication date: February 26, 2009
    Applicant: Kabushiki Kaisha Toshiba
    Inventors: Toshiaki Edahiro, Kazushige Kanda, Naoya Tokiwa, Takuya Futatsuyama, Koji Hosono, Shigeo Ohshima
  • Publication number: 20090003103
    Abstract: A semiconductor device, a semiconductor memory tester, and a multi-chip package are provided. The semiconductor device includes a plurality of nonvolatile semiconductor memories; a boosting circuit which generates a boosted voltage for operating the plurality of nonvolatile semiconductor memories; and a boosting circuit controller which controls the operation of the boosting circuit to generate the boosted voltage on the basis of an operation sequence of the plurality of nonvolatile semiconductor memories.
    Type: Application
    Filed: June 19, 2008
    Publication date: January 1, 2009
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Yuui SHIMIZU, Shigeo Ohshima, Mie Matsuo
  • Publication number: 20080291716
    Abstract: A method of programming a non-volatile memory device with memory cells formed of variable resistance elements and disposed between word lines and bit lines, includes: previously charging a selected word line and a selected bit line together with a non-selected word line and a non-selected bit line up to a certain voltage; and further charging the selected word line and the non-selected bit line up to a program voltage higher than the certain voltage and a program-block voltage, respectively, and simultaneously discharging the selected bit line.
    Type: Application
    Filed: May 20, 2008
    Publication date: November 27, 2008
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Takuya Futatsuyama, Koji Hosono, Toshiaki Edahiro, Naoya Tokiwa, Kazushige Kanda, Shigeo Ohshima
  • Publication number: 20080151640
    Abstract: This disclosure concerns a device outputting data to the outside comprising a first transistor with a first conductive type which is connected between an output low voltage corresponding to a first logical value and the pad and which connects the output low voltage to the pad when the digital data has the first logical value; a second transistor with a second conductive type which is connected between an output high voltage corresponding to a second logical value and the pad and which connects the output high voltage to the pad when the digital data has the second logical value; and a third transistor with the first conductive type which is connected between the output high voltage and the pad so as to be parallel to the second transistor and which connects the output high voltage to the pad when the digital data has the second logical value.
    Type: Application
    Filed: December 10, 2007
    Publication date: June 26, 2008
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Eiichi MAKINO, Shigeo Ohshima