Method and apparatus for managing a memory array

Electrical computers and digital processing systems: memory – Storage accessing and control – Control technique

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711133, 711134, 711136, 711159, G06F 1200

Patent

active

061051152

ABSTRACT:
A NRU algorithm is used to track lines in each region of a memory array such that the corresponding NRU bits are reset on a region-by-region basis. That is, the NRU bits of one region are reset when all of the bits in that region indicate that their corresponding lines have recently been used. Similarly, the NRU bits of another region are reset when all of the bits in that region indicate that their corresponding lines have recently been used. Resetting the NRU bits in one region, however, does not affect the NRU bits in another region. A LRU algorithm is used to track the regions of the array such that each region has a single corresponding entry in a LRU table. That is, all the lines in a single region collectively correspond to a single LRU entry. A region is elevated to most recently used status in the LRU table once the NRU bits of the region are reset.

REFERENCES:
patent: 5394531 (1995-02-01), Smith
patent: 5497477 (1996-03-01), Trull
patent: 5542066 (1996-07-01), Mattson et al.
patent: 5809280 (1998-09-01), Chard et al.
patent: 5809528 (1998-09-01), Miller et al.
patent: 5845309 (1998-12-01), Shirotori et al.

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