Patents by Inventor Kohtaroh Satoh

Kohtaroh Satoh 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).

  • System for executing, canceling, or suspending a DMA transfer based upon internal priority comparison between a DMA transfer and an interrupt request
    Patent number: 5974479
    Abstract: A data processing device having a DMA function for controlling DMA transfer, comprises a DMA unit, a CPU, a bus arbitration unit for controlling bus-using right of the DMA unit or the CPU, and an interruption controller for supplying an interruption request signal. The DMA unit includes a register, a comparator for making a comparison between a priority of a DMA transfer and a priority set on an interruption request, and a sequencer for deciding whether the DMA transfer is to be executed, canceled, or suspended in the operation state of a DMA unit according to the comparison result of the comparator.
    Type: Grant
    Filed: August 8, 1997
    Date of Patent: October 26, 1999
    Assignee: NEC Corporation
    Inventor: Kohtaroh Satoh