The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 31, 2012
Filed:
Dec. 09, 2008
Brian Keith Langendorf, Benicia, CA (US);
David B. Glasco, Austin, TX (US);
Michael Brian Cox, Menlo Park, CA (US);
Jonah M. Alben, San Jose, CA (US);
Brian Keith Langendorf, Benicia, CA (US);
David B. Glasco, Austin, TX (US);
Michael Brian Cox, Menlo Park, CA (US);
Jonah M. Alben, San Jose, CA (US);
NVIDIA Corporation, Santa Clara, CA (US);
Abstract
A method and system for maintaining cache coherency across a serial interface bus such as a Peripheral Component Interconnect Express (PCIe) bus. The method includes generating a snoop request (SNP) to determine whether first data stored in a local memory is coherent relative to second data stored in a data cache, the snoop request including destination information that identifies the data cache on the serial interface bus, and causing the snoop request to be transmitted over the serial interface bus to a second processor. The method further includes extracting a cache line address from the snoop request, determining whether the second data is coherent, generating a complete message (CPL) indicating that the first data is coherent with the second data, and causing the complete message to be transmitted over the bus to the first processor. The snoop request and complete messages may be vendor defined messages.