Patents by Inventor Long D. Ngyuen

Long D. Ngyuen 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).

  • DMA access arbitration device in which CPU can arbitrate on behalf of attachment having no arbiter
    Patent number: 5241661
    Abstract: In a computer system having both peripherals having their own DMA channel arbiter and peripherals having no arbiter, a separate arbitration unit, controlled directly by the CPU, is provided to arbitrate on behalf of peripherals having no arbiter. The CPU can thus freely assign different arbitration levels to such peripherals, and can instruct the arbitration unit to simultaneously arbitrate on different arbitration levels or for two or more DMA channels.
    Type: Grant
    Filed: July 10, 1992
    Date of Patent: August 31, 1993
    Assignee: International Business Machines Corporation
    Inventors: Ian A. Concilio, Jeffrey A. Hawthorne, Chester A. Heath, Jorge F. Lenta, Long D. Ngyuen