Method and apparatus for removing speculative memory accesses from a memory access queue for issuance to memory or discarding
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United States of America Patent
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Nov 25, 2003
Grant Date -
N/A
app pub date -
Jul 27, 2000
filing date -
Jul 27, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A memory controller generates speculative and non-speculative memory access requests. Several approaches are used to prevent speculative memory access requests from interfering with non-speculative memory access requests. When a request queue is full and contains at least one speculative request, that request is replaced in the memory access request queue with a non-speculative request. A counter associated with a speculative memory access request counts memory access requests. When a predetermined count value is reach, the speculative memory access request is assumed to be stale and retired from the request queue, thereby reducing possible interference by speculative accesses with non-speculative accesses and/or avoiding wasted bandwidth utilization by stale speculative access requests.
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