Memory access request result prediction prior to confirm signal

Details Memory access request result prediction prior to confirm signal Memory access request result prediction prior to confirm signal

1997-11-03

2000-03-07

Peikari, B. James

Electrical computers and digital processing systems: memory

Address formation

Generating prefetch, look-ahead, jump, or predictive address

711204, 711137, 712233, 712207, 712237, 712236, 712239, G06F 938

Patent

active

06035383&

ABSTRACT:
A data processing system having a processor core 4, a memory management unit 6 and a cache memory 8 uses the memory management unit 6 to produce a confirm signal C that indicates that a memory access request will be processed no further, i.e. the outcome is fully determined. The next memory access request is initiated prior to this confirm signal C being available and accordingly if the confirm signal C indicates a result different to that predicted, then a stall of the system is required until the non-confirmed memory access request can be dealt with. A result prediction unit 14 is responsive to one or more variable signals characterising the memory access request and serves to produce a result prediction signal RP indicating in which of a plurality of ways said memory access requested will complete, which is available before the confirm signal C, and upon which an appropriate predicted next memory access request may be prepared for use if the confirm signal C indicates that the memory access request will be processed no further. In this way, the performance impact of late indication of partial processing can be reduced, particularly in the case of common and relatively easy to predict circumstances such as cache storage line wrap.

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