Patents by Inventor Nader Raygani

Nader Raygani 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).

  • Method and apparatus for handling bus master and direct memory access (DMA) requests at an I/O controller
    Patent number: 5862387
    Abstract: A computer system that implements a direct memory access (DMA) request passing protocol. The computer system may comprise a Peripheral Component Interconnect (PCI) bus that includes an electrical interface as specified by a PCI Local Bus standard. The PCI bus is coupled to at least one DMA agent and a DMA controller. The DMA agent issues DMA requests to the DMA controller using the electrical interface of the PCI bus. According to one embodiment, a system I/O controller receives the DMA requests and passes them on to the DMA controller, which arbitrates the DMA requests and passes back a grant to the system I/O controller. The system I/O controller uses the electrical interface of the PCI bus to pass the grant to the DMA agent. The same DMA request passing protocol may be implemented in any bus having an electrical interface that specifies a unique request signal line for each bus agent of the bus.
    Type: Grant
    Filed: June 27, 1997
    Date of Patent: January 19, 1999
    Assignee: Intel Corporation
    Inventors: Neil W Songer, James P. Kardach, Sung-Soo Cho, Jim S. Cheng, Debra T. Cohen, John W. Horigan, Nader Raygani, Seyed Yahay Sotoudeh, David I. Poisner
  • Method and apparatus for handling bus master channel and direct memory access (DMA) channel access requests at an I/O controller
    Patent number: 5664197
    Abstract: A computer system that implements a direct memory access (DMA) request passing protocol. The computer system may comprise a Peripheral Component Interconnect (PCI) bus that includes an electrical interface as specified by a PCI Local Bus standard. The PCI bus is coupled to at least one DMA agent and a DMA controller. The DMA agent issues DMA requests to the DMA controller using the electrical interface of the PCI bus. According to one embodiment, a system I/O controller receives the DMA requests and passes them on to the DMA controller, which arbitrates the DMA requests and passes back a grant to the system I/O controller. The system I/O controller uses the electrical interface of the PCI bus to pass the grant to the DMA agent. The same DMA request passing protocol may be implemented in any bus having an electrical interface that specifies a unique request signal line for each bus agent of the bus.
    Type: Grant
    Filed: April 21, 1995
    Date of Patent: September 2, 1997
    Assignee: Intel Corporation
    Inventors: James P. Kardach, Sung-Soo Cho, Jim S. Cheng, Debra T. Cohen, John W. Horigan, Nader Raygani, Seyed Yahay Sotoudeh, David I. Poisner, Neil W. Songer