Node for servicing interrupt request messages on a pended bus

G - Physics – 06 – F

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354/230.82

G06F 13/24 (2006.01) G06F 15/17 (2006.01)

Patent

CA 1303226

66822-50 ABSTRACT The invention relates to the servicing of intercepts over a pended bus for transferring messages between multiple nodes in a computer system. An interrupt servicing node is adapted to be coupled to a pended bus for transferring messages between the interrupt servicing node and an interrupting node, and services an interrupt request message including ID data identify- ing the interrupting node. The interrupt servicing node detects the interrupt request message on the bus and provides to the bus an interrupt acknowledge message including destination data specifying the interrupting node at times when the interrupt servicing node is ready to service the interrupt request message from the interrupting node. The interrupt servicing node includes a store including a node storage element corresponding to the interrupting node, for indicating whether an interrupt request is pending from the interrupting node. The store sets the node storage element in response to the detecting of the interrupt request message including the ID data identifying the interrupt- ing node and clears the node storage element in response to providing the bus of an interrupt acknowledge message including destination data specifying the interrupting node, thereby indicat- ing that the interrupt request message of the interrupting node is being serviced.

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