Adaptive memory access speculation

Details Adaptive memory access speculation Adaptive memory access speculation

2006-06-06

2006-06-06

Moazzami, Nasser (Department: 2187)

Electrical computers and digital processing systems: memory

Storage accessing and control

Hierarchical memories

C712S207000

Reexamination Certificate

active

07058767

ABSTRACT:
A method and system for speculatively pre-fetching data from a memory. A memory controller on a data bus “snoops” data requests put on the data bus by a bus control logic. Based on information in the header of the data request, such as transaction type, tag, transaction size, etc., a speculative pre-fetch is made to read data from the memory associated with the memory controller. If the speculative fetch turns out to be correct, then the memory controller makes an assumption that the pre-fetch was too conservative (non-speculative), and a pre-fetch for a next data request is performed at an earlier more speculative time. If the speculative fetch turns out to be incorrect, then the memory controller makes an assumption that the pre-fetch was too speculative (made early), and a pre-fetch for a next data request is performed at a later less speculative time.

REFERENCES:
patent: 5146578 (1992-09-01), Zangenehpour
patent: 5263153 (1993-11-01), Intrater et al.
patent: 5608878 (1997-03-01), Arimilli et al.
patent: 6275909 (2001-08-01), Arimilli et al.
patent: 6347369 (2002-02-01), Witt
patent: 6490658 (2002-12-01), Ahmed et al.
patent: 6567900 (2003-05-01), Kessler
patent: 6678795 (2004-01-01), Moreno et al.
patent: 2002/0123041 (2002-09-01), McMichael
“CPC710-133 PCI Bridge and SDRAM Memory Controller”, Copyright IBM Corporation 2002, All Rights Reserved, Printed in the U.S.A. Apr. 2002, www.ibm.com/powerpc.

Affiliated with

Also associated with

Rating

Adaptive memory access speculation does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Adaptive memory access speculation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Adaptive memory access speculation will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3674929