Latency hiding for a memory management unit page table lookup
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United States of America Patent
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Jun 19, 2012
Grant Date -
Nov 13, 2008
app pub date -
Jun 26, 2007
filing date -
May 11, 2007
priority date (Note) -
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status (Latency Note)
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Abstract
In certain systems, local requests 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.
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