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Method and apparatus for granting processors access to a resource

United States Patent

7,680,971
March 16, 2010
View the Complete Patent at the US Patent & Trademark Office
An apparatus and method for granting one or more requesting entities access to a resource in a predetermined time interval. The apparatus includes a first circuit receiving one or more request signals, and implementing logic for assigning a priority to the one or more request signals, and, generating a set of first_request signals based on the priorities assigned. One or more priority select circuits for receiving the set of first_request signals and generating corresponding one or more fixed grant signals representing one or more highest priority request signals when asserted during the predetermined time interval. A second circuit device receives the one or more fixed grant signals generates one or more grant signals associated with one or more highest priority request signals assigned, the grant signals for enabling one or more respective requesting entities access to the resource in the predetermined time interval, wherein the priority assigned to the one or more request signals changes each successive predetermined time interval. In one embodiment, the assigned priority is based on a numerical pattern, the first circuit changing the numerical pattern with respect to the first_request signals generated at each successive predetermined time interval.
Blumrich; Matthias A. (Ridgefield, CT), Salapura; Valentina (Chappaqua, NY)
International Business Machines Corporation (Armonk, NY)
11/ 768,799
20090006692
June 26, 2007
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OF DEVELOPMENT The U.S. Government has a paid-up license in this invention and the right in limited circumstances to require the patent owner to license others on reasonable terms as provided for by the terms of Contract. No. B554331 awarded by the Department of Energy.