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:
Oct. 12, 2004
Filed:
Jan. 16, 2002
Joe Perry Cowan, Fort Collins, CO (US);
Hewlett-Packard Development Company, L.P., Houston, TX (US);
Abstract
A bridge device for use in computer systems has a first interface to a first interconnect apparatus such as a processor bus. It also has a second interface to second interconnect apparatus such as an I/O bus. The second interconnect apparatus is of a type capable of connection to a DMA-capable peripheral device. The bridge device has address translation hardware to translate I/O virtual addresses received from the second interface into physical memory addresses for transmission onto the first interface. The address translation hardware has an associated coherency maintenance apparatus. In a particular embodiment, the address translation hardware has a translation lookaside buffer and the coherency maintenance apparatus is apparatus for snooping through the first interface, invalidating TLB entries when a page table in memory is updated.