Patents by Inventor Fred Dunlap

Fred Dunlap 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).

  • Coprocessor interface supporting I/O or memory mapped communications
    Patent number: 5420989
    Abstract: A coprocessor 18 comprises a bus controller 24 which further comprises a primary bus controller 28 and a secondary bus controller 30 that drive a floating point processor core 26. The primary bus controller 28 comprises a memory mapped bus interface 32 for processing memory mapped format instructions and an I/O bus interface 34 for processing conventional I/O format instructions. The primary bus controller 28 remains essentially transparent for execution of I/O format instructions and translates memory mapped format instructions into sequential bus cycles compatible to an I/O bus interface for processing conventional I/O format instructions, and for execution by the floating point processor core.
    Type: Grant
    Filed: June 12, 1991
    Date of Patent: May 30, 1995
    Assignee: Cyrix Corporation
    Inventors: Robert D. Maher, III, John Eitrheim, Fred Dunlap, Thomas B. Brightman