Patents Represented by Attorney, Agent or Law Firm Frederick J. Telecky, J
  • Patent number: 6215685
    Abstract: A content addressable memory (CAM) (30) and a method of using it to sequentially match tags stored in the CAM to a target tag. The CAM (30) has a tag memory (20) comprised of tag cells (10, 10a) and also has a data cache. Each tag cell (10, 10a) is structured like a conventional RAM cell for storing a bit of data but also has a multiplexing switch (16) at its output. The multiplexing switch (16) applies a signal representing the tag cell's contents to a readline (15). A tag compare circuit (25) external to tag memory (20). On each readline, tag compare circuit (25) compares a bit from each cell (10, 10a) in a selected column to a bit of the target address. This cycle is repeated for all bits of the target address and successive columns of the tag memory unless terminated by a mismatch for all cells (10, 10a) in a column. The tag compare circuit (25) has logic circuitry that maintains a “hit” output signal.
    Type: Grant
    Filed: November 30, 1998
    Date of Patent: April 10, 2001
    Assignee: Texas Instruments Incorporated
    Inventors: Pak Kuen Fung, Heip Van Tran