Patents by Inventor Wesley S. Johnson

Wesley S. Johnson 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 DMA transfer wherein controller waits before execution of next instruction until a counter counts down from a value loaded by said controller
    Patent number: 5812878
    Abstract: An apparatus for and method of controlling data transfers in which the data is in a predefined format. The DMA controller with a status register cooperates with a counter capable of effecting a change in the contents of the status register to generate predefined leading sequences of pulses. The arrangement may also include a module which can detect a predefined trailing sequence and effect a change in the contents of the status register.
    Type: Grant
    Filed: May 10, 1996
    Date of Patent: September 22, 1998
    Assignee: Apple Computer, Inc.
    Inventors: Kevin M. Christiansen, Wesley S. Johnson