Patents by Inventor Paul Rubinfeld

Paul Rubinfeld 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).

  • Cache invalidate protocol for digital data processing system
    Patent number: 4814981
    Abstract: A mechanism for determining when the contents of a block in a cache memory have been rendered stale by DMA activity external to a processor and for marking the block stale in response to a positive determination. The commanding unit in the DMA transfer, prior to transmitting an address, asserts a cache control signal which conditions the processor to receive the address and determine whether there is a correspondence to the contents of the cache. If there is a correspondence, the processor marks the contents of that cache location for which there is a correspondence stale.
    Type: Grant
    Filed: September 18, 1986
    Date of Patent: March 21, 1989
    Assignee: Digital Equipment Corporation
    Inventor: Paul Rubinfeld