Patents by Inventor Toshihiko Wakahara

Toshihiko Wakahara 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).

  • Data transfer system in which data is transferred to or from a data memory during an instruction fetch cycle
    Patent number: 5481677
    Abstract: A data transfer system has an address bus and a data bus, each divided into two parts by a bus switch. A microprocessor and program memory are connected to the first parts of the address and data buses. A data memory, data transfer controller, and input/output devices are connected to the second parts of tile address and data buses. While the microprocessor is fetching an instruction from the program memory, the bus switches disconnect the two parts of the buses, enabling the data transfer controller to transfer data directly between the data memory and input/output devices. At other times the bus switches connect the two parts of the buses, enabling the microprocessor to access the data memory and Input/output devices.
    Type: Grant
    Filed: September 3, 1992
    Date of Patent: January 2, 1996
    Assignees: Oki Electric Industry Co., Ltd., Nippon Telegraph And Telephone Corporation
    Inventors: Yoshihide Kai, Hiroya Tanigawa, Toshihiko Wakahara