Patents by Inventor Yu Qing Cheng

Yu Qing Cheng 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).

  • Small and power-efficient cache that can provide data for background DNA devices while the processor is in a low-power state
    Patent number: 7412570
    Abstract: A small and power-efficient buffer/mini-cache sources and sinks selected DMA accesses directed to a memory space included in a coherency domain of a microprocessor when cached data in the microprocessor is inaccessible due to any or all of the microprocessor being in a low-power state not supporting snooping. Satisfying the selected DMA accesses via the buffer/mini-cache enables reduced power consumption by allowing the microprocessor (or portion thereof) to remain in the low-power state. The buffer/mini-cache may be operated (temporarily) incoherently with respect to the cached data in the microprocessor and flushed before deactivation to synchronize with the cached data when the microprocessor (or portion thereof) transitions to a high-power state that enables snooping. Alternatively the buffer/mini-cache may be operated in a manner (incrementally) coherent with the cached data.
    Type: Grant
    Filed: February 9, 2006
    Date of Patent: August 12, 2008
    Assignees: Sun Microsystems, Inc., Sun Microsystems Technology LTD
    Inventors: Laurent R. Moll, Yu Qing Cheng, Peter N. Glaskowsky, Seungyoon Peter Song