Anthony F Vivenzio from 119 Nichols Dr, Taunton, MA 02780, age 58, Phone: (508)8285992

Latency Hiding For A Memory Management Unit Page Table Lookup
view source
US Patent:

20080282006, Nov 13, 2008
Filed:

Jun 26, 2007
Appl. No.:

11/768375
Inventors:

Anthony F. Vivenzio - Taunton MA, US
Denis J. Foley - Shrewsbury MA, US
Assignee:

ADVANCED MICRO DEVICES, INC. - Sunnyvale CA
International Classification:

G06F 13/00
US Classification:

710107
Abstract:

In certain systems, local request's require corresponding associated information to be present in order to be serviced. A local memory stores some of the associated information. There is latency associated with retrieval of associated information that is not immediately available. Logic operates for each local request to access the local memory to ascertain whether the associated information corresponding to the local request, is present If the associated information is present, a request is placed in an output request queue to service the local request If the associated information is not present, a request is placed on a bypass path to retrieve the associated information. Requests issue from the bypass path with priority over requests from the output request queue. Useful work is thereby done during the latency of associated information retrieval. The arrangement is useful in a TLB in an MMU.