Patents by Inventor Phillip D. Davis

Phillip D. Davis 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).

  • Circuits, systems and methods for testing integrated circuit devices including logic and memory circuitry
    Patent number: 5535165
    Abstract: A single chip integrated circuit 200 is disclosed which includes logic circuitry 202, memory circuitry 204, and a bus 300. First bus control circuitry 302 controls the exchange of signals between logic circuitry 202 and bus 300. Second bus control circuitry 303 controls the exchange of signals between memory circuitry 204 and bus 300. Third bus control circuitry 306 is included which controls the exchange of signals between bus 300 and at least one test pin 206. Mode control circuitry 205 is operable as control circuitry 302, 303, and 306. In the operating mode, mode control circuitry 205 activates first bus control circuitry 302 and second bus control circuitry 303. In a memory test mode, mode control circuitry 205 activates second bus control circuitry 303 and third bus control circuitry 306 and deactivates first bus control circuitry 302.
    Type: Grant
    Filed: June 30, 1995
    Date of Patent: July 9, 1996
    Assignee: Cirrus Logic, Inc.
    Inventors: Phillip D. Davis, Sudhir Sharma, Hai Long