Electrical computers and digital processing systems: memory – Storage accessing and control – Hierarchical memories
Reexamination Certificate
2005-11-29
2005-11-29
Padmanabhan, Mano (Department: 2189)
Electrical computers and digital processing systems: memory
Storage accessing and control
Hierarchical memories
C709S230000, C709S231000, C709S232000, C711S141000, C711S144000, C711S145000, C711S156000, C711S163000
Reexamination Certificate
active
06970979
ABSTRACT:
A computer system may include a directory, several active devices configured to access data, an address network configured to convey address packets point-to-point between the active devices and the directory, and a data network configured to convey data between the active devices and the directory. The address network may include a response virtual network configured to convey response packets and a multicast virtual network configured to convey invalidating packets. A first active device may be configured to transition an ownership responsibility for a coherency unit upon receipt of a response packet and to transition an access right to the coherency unit upon receipt of a corresponding data packet. The ownership responsibility for the coherency unit transitions at a different time than the access right to the coherency unit transitions.
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Kivlin B. Noäl
Meyertons Hood Kivlin Kowert & Goetzel P.C.
Namazi Mehdi
Padmanabhan Mano
Sun Microsystems Inc.
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