Patents by Inventor David D. Sprague

David D. Sprague 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 pseudo-direct access to embedded memories of a micro-controller integrated circuit via the IEEE test access port
    Patent number: 5828825
    Abstract: A method and apparatus are provided for testing memory locations of embedded memories or on-board caches of a micro-controller, a micro-processor or a CPU-based integrated circuit through use of a test access port (TAP) such as the IEEE TAP described in "IEEE Standard Test Access Port and Boundary-Scan Architecture" (IEEE Std. 1149.1-1990). The TAP is utilized to serially shift address, data and command information provided by an external host into respective fields of a memory access register (MEMACC) located within a memory interface unit (MIU) of the CPU-based IC. Responsive to the command information, the TAP requests access to the IC's memory bus via the MIU. Next, the address, data and command information for accessing the embedded memory are serially shifted into the MEMACC.
    Type: Grant
    Filed: April 12, 1996
    Date of Patent: October 27, 1998
    Assignee: Intel Corporation
    Inventors: Nick G. Eskandari, David D. Sprague