Patents by Inventor Kazumi Haijima

Kazumi Haijima 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).

  • Structure and method of performing DMA transfers between memory and I/O devices utilizing a single DMA controller within a notebook and docking station computer system
    Patent number: 5875312
    Abstract: A computer system (6,7) includes first and second I/O circuits (932, 934, 51, 97), first and second buses (904, 83) respectively coupled to the first and second I/O circuits (932, 934, 51, 97), a memory (106), a third bus (104) coupled to the memory (106), and first and second bus interface circuits (902, 6920) connected between the third bus (104) and the first and second buses (904, 83) respectively. A direct memory access (DMA) controller (910) is coupled to the first bus (904) and to the first bus interface circuit (902), and a serial communications circuit (7010, 6910, 7020) is connected between the DMA controller (910) and the second bus interface circuit (6920). As an example, in the present invention a single DMA controller may be used to provide DMA capability to both a notebook computer and a docking station, using an interface between the notebook computer and the docking station to transfer DMA related information between the DMA controller and a requesting device in the docking station.
    Type: Grant
    Filed: December 3, 1996
    Date of Patent: February 23, 1999
    Assignee: Texas Instruments Incorporated
    Inventors: James J. Walsh, Joseph Joe, Robert W. Milhaupt, James Bridgwater, Kazumi Haijima
  • Computer system and an electronic circuit utilizing a single DMA controller and additional communication circuit to manage DMA transfers between memory and I/O devices
    Patent number: 5848253
    Abstract: A computer system (6,7) includes first and second I/O circuits (932, 934), first and second buses (904, 83) respectively coupled to the first and second I/O circuits (932, 934), a memory (106), a third bus (104) coupled to the memory (106), and first and second bus interface circuits (902, 6920) connected between the third bus (104) and the first and second buses (904, 83) respectively. A direct memory access (DMA) controller (910) is coupled to the first bus (904) and to the first bus interface circuit (906), and a serial communications circuit (7010, 6910, 7020) is connected between the DMA controller (910) and the second bus interface circuit (6920). As an example, in the present invention a single DMA controller may be used to provide DMA capability to both a notebook computer and a docking station, using an interface between the notebook computer and the docking station to transfer DMA station. Other devices, systems and methods are also disclosed.
    Type: Grant
    Filed: January 22, 1997
    Date of Patent: December 8, 1998
    Assignee: Texas Instruments Incorporated
    Inventors: James J. Walsh, Joseph Joe, Robert W. Milhaupt, James Bridgwater, Kazumi Haijima
  • Method and apparatus for implementing a single DMA controller to perform DMA operations for devices on multiple buses in docking stations, notebook and desktop computer system
    Patent number: 5835733
    Abstract: A computer system (6,7) includes first and second I/O circuits (932, 934), 51, 97 first and second buses (904, 83) respectively coupled to the first and second I/O circuits (932, 934), 51, 97 a memory (106), a third bus (104) coupled to the memory (106), and first and second bus interface circuits (902, 6920) connected between the third bus (104) and the first and second buses (904, 83) respectively. A direct memory access (DMA) controller (910) is coupled to the first bus (904) and to the first bus interface circuit (902), and a serial communications circuit (7010, 6910, 7020) is connected between the DMA controller (910) and the second bus interface circuit (6920). As an example, in the present invention a single DMA controller may be used to provide DMA capability to both a notebook computer and a docking station, using an related information between the DMA controller and a requesting device in the docking station. Other devices, systems and methods are also disclosed.
    Type: Grant
    Filed: December 22, 1994
    Date of Patent: November 10, 1998
    Assignee: Texas Instruments Incorporated
    Inventors: James J. Walsh, Joseph Joe, Robert W. Milhaupt, James Bridgwater, Kazumi Haijima