Patents by Inventor Akitsugu Nakayama

Akitsugu Nakayama 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).

  • Publication number: 20190147124
    Abstract: An operation model generator includes one or more memories, and one or more processors configured to perform acquisition of signal information indicating signal values of an input signal and an output signal in a first register transfer level operation model of a logic circuit, and generate a hardware description language operation model of the logic circuit in accordance with the acquired signal information.
    Type: Application
    Filed: November 7, 2018
    Publication date: May 16, 2019
    Applicant: FUJITSU LIMITED
    Inventors: Akitsugu NAKAYAMA, Takashi Ishikawa, Koichi Shirakawa, Noritoshi Yamakawa
  • Patent number: 8225243
    Abstract: A method for developing integrated circuits includes generating a core (logic core) in an HDL format readable by a logic synthesis tool, from an ASIC core (logic core) made of ports of blocks and port connection information, creating a temporary chip design from chip terminal information to generate a terminal in the temporary chip design, generating a design identical to that created, as a cell within the design created, connecting a design port with a cell port, wherein a name of the design port is identical to a name of the cell port, inserting an I/O buffer, depending on the device technology, into a net between the ports connected, replacing the cell by the core (logic core) created to gerate a netlist, and expanding a hierarchy of the design, being the top hierarchy.
    Type: Grant
    Filed: November 17, 2009
    Date of Patent: July 17, 2012
    Assignee: Fujitsu Limited
    Inventors: Chiaki Koga, Masayuki Tsuda, Akitsugu Nakayama
  • Patent number: 7805688
    Abstract: A logical memory construction-processing section reads several kinds of physical memories and registers prepared in advance as libraries, generates candidates for each logical memory, by combining only the physical memories or only the registers, or both the physical memories and the registers, with each other, so as to construct the logical memory that satisfies a logical condition defining a memory space, and selects highest priority candidates for the logical memories from the candidates according to priorities. An optimum construction extraction-processing section extracts optimum logical memories satisfying the respective logical conditions from the highest priority candidates such that the limit numbers of usable physical memories and usable registers are satisfied. A circuit description-processing section executes circuit description by using the physical memories and the registers that construct each of the extracted optimum logical memories, to thereby generate a circuit description file.
    Type: Grant
    Filed: January 29, 2007
    Date of Patent: September 28, 2010
    Assignee: Fujitsu Limited
    Inventors: Noritoshi Yamakawa, Hiroaki Miyamoto, Yoshikatsu Kouhara, Akitsugu Nakayama, Kouichi Tanda
  • Publication number: 20100070943
    Abstract: A method for developing integrated circuits includes generating a core (logic core) in an HDL format readable by a logic synthesis tool, from an ASIC core (logic core) made of ports of blocks and port connection information, creating a temporary chip design from chip terminal information to generate a terminal in the temporary chip design, generating a design identical to that created, as a cell within the design created, connecting a design port with a cell port, wherein a name of the design port is identical to a name of the cell port, inserting an I/O buffer, depending on the device technology, into a net between the ports connected, replacing the cell by the core (logic core) created to gerate a netlist, and expanding a hierarchy of the design, being the top hierarchy.
    Type: Application
    Filed: November 17, 2009
    Publication date: March 18, 2010
    Applicant: FUJITSU LIMITED
    Inventors: Chiaki Koga, Masayuki Tsuda, Akitsugu Nakayama
  • Patent number: 7650586
    Abstract: A method for developing integrated circuits includes generating a core (logic core) in an HDL format readable by a logic synthesis tool, from an ASIC core (logic core) made of ports of blocks and port connection information, creating a temporary chip design from chip terminal information to generate a terminal in the temporary chip design, generating a design identical to that created, as a cell within the design created, connecting a design port with a cell port, wherein a name of the design port is identical to a name of the cell port, inserting an I/O buffer, depending on the device technology, into a net between the ports connected, replacing the cell by the core (logic core) created to generate a netlist, and expanding a hierarchy of the design, being the top hierarchy.
    Type: Grant
    Filed: December 11, 2006
    Date of Patent: January 19, 2010
    Assignee: Fujitsu Limited
    Inventors: Chiaki Koga, Masayuki Tsuda, Akitsugu Nakayama
  • Patent number: 7647575
    Abstract: A method for developing integrated circuits includes generating a core (logic core) in an HDL format readable by a logic synthesis tool, from an ASIC core (logic core) made of ports of blocks and port connection information, creating a temporary chip design from chip terminal information to generate a terminal in the temporary chip design, generating a design identical to that created, as a cell within the design created, connecting a design port with a cell port, wherein a name of the design port is identical to a name of the cell port, inserting an I/O buffer, depending on the device technology, into a net between the ports connected, replacing the cell by the core (logic core) created to gerate a netlist, and expanding a hierarchy of the design, being the top hierarchy.
    Type: Grant
    Filed: December 11, 2006
    Date of Patent: January 12, 2010
    Assignee: Fujitsu Limited
    Inventors: Chiaki Koga, Masayuki Tsuda, Akitsugu Nakayama
  • Publication number: 20070180213
    Abstract: A memory construction apparatus for automatically forming a logical memory space, thereby making it possible to design an integrated circuit efficiently. A logical memory construction-processing section reads several kinds of physical memories and registers prepared in advance as libraries, generates candidates for each logical memory, by combining only the physical memories or only the registers, or both the physical memories and the registers, with each other, so as to construct the logical memory that satisfies a logical conditions defining a memory space, and selects highest priority candidates for the logical memories from the candidates according to priorities. An optimum construction extraction-processing section extracts optimum logical memories satisfying the respective logical conditions from the highest priority candidates such that the limit numbers of usable physical memories and usable registers are satisfied.
    Type: Application
    Filed: January 29, 2007
    Publication date: August 2, 2007
    Applicant: FUJITSU LIMITED
    Inventors: Noritoshi Yamakawa, Hiroaki Miyamoto, Yoshikatsu Kouhara, Akitsugu Nakayama, Kouichi Tanda
  • Patent number: 7219311
    Abstract: A method for developing integrated circuits includes generating a core (logic core) in an HDL format readable by a logic synthesis tool, from an ASIC core (logic core) made of ports of blocks and port connection information, creating a temporary chip design from chip terminal information to generate a terminal in the temporary chip design, generating a design identical to that created, as a cell within the design created, connecting a design port with a cell port, wherein a name of the design port is identical to a name of the cell port, inserting an I/O buffer, depending on the device technology, into a net between the ports connected, replacing the cell by the core (logic core) created to gerate a netlist, and expanding a hierarchy of the design, being the top hierarchy.
    Type: Grant
    Filed: October 18, 2004
    Date of Patent: May 15, 2007
    Assignee: Fujitsu Limited
    Inventors: Chiaki Koga, Masayuki Tsuda, Akitsugu Nakayama
  • Publication number: 20070083845
    Abstract: A method for developing integrated circuits includes generating a core (logic core) in an HDL format readable by a logic synthesis tool, from an ASIC core (logic core) made of ports of blocks and port connection information, creating a temporary chip design from chip terminal information to generate a terminal in the temporary chip design, generating a design identical to that created, as a cell within the design created, connecting a design port with a cell port, wherein a name of the design port is identical to a name of the cell port, inserting an I/O buffer, depending on the device technology, into a net between the ports connected, replacing the cell by the core (logic core) created to generate a netlist, and expanding a hierarchy of the design, being the top hierarchy.
    Type: Application
    Filed: December 11, 2006
    Publication date: April 12, 2007
    Applicant: FUJITSU LIMITED
    Inventors: Chiaki Koga, Masayuki Tsuda, Akitsugu Nakayama
  • Publication number: 20070083840
    Abstract: A method for developing integrated circuits includes generating a core (logic core) in an HDL format readable by a logic synthesis tool, from an ASIC core (logic core) made of ports of blocks and port connection information, creating a temporary chip design from chip terminal information to generate a terminal in the temporary chip design, generating a design identical to that created, as a cell within the design created, connecting a design port with a cell port, wherein a name of the design port is identical to a name of the cell port, inserting an I/O buffer, depending on the device technology, into a net between the ports connected, replacing the cell by the core (logic core) created to gerate a netlist, and expanding a hierarchy of the design, being the top hierarchy.
    Type: Application
    Filed: December 11, 2006
    Publication date: April 12, 2007
    Applicant: FUJITSU LIMITED
    Inventors: Chiaki Koga, Masayuki Tsuda, Akitsugu Nakayama
  • Publication number: 20050071787
    Abstract: A method for developing integrated circuits includes generating a core (logic core) in an HDL format readable by a logic synthesis tool, from an ASIC core (logic core) made of ports of blocks and port connection information, creating a temporary chip design from chip terminal information to generate a terminal in the temporary chip design, generating a design identical to that created, as a cell within the design created, connecting a design port with a cell port, wherein a name of the design port is identical to a name of the cell port, inserting an I/O buffer, depending on the device technology, into a net between the ports connected, replacing the cell by the core (logic core) created to gerate a netlist, and expanding a hierarchy of the design, being the top hierarchy.
    Type: Application
    Filed: October 18, 2004
    Publication date: March 31, 2005
    Applicant: Fujitsu Limited
    Inventors: Chiaki Koga, Masayuki Tsuda, Akitsugu Nakayama