Peer-to-peer bus segment bridging

Details Peer-to-peer bus segment bridging Peer-to-peer bus segment bridging

2005-12-13

2005-12-13

Auve, Glenn A. (Department: 2112)

Electrical computers and digital data processing systems: input/

Intrasystem connection

Bus interface architecture

C710S005000, C710S313000, C711S158000

Reexamination Certificate

active

06976115

ABSTRACT:
A method and apparatus are described for facilitating proper ordering of peer-to-peer communications between bridged bus segments. According to one embodiment of the present invention a fence command is issued when a peer-to-peer communication between devices on separate bus segments connected on the same side of a bridge is detected. The fence command is inserted into a plurality of buffers in an I/O hub corresponding to the bus segments to force temporary ordering across all pipes of the I/O hub. The hub prohibits processing of subsequent commands from a buffer once a fence command has been read from that buffer until a corresponding fence command is read from all other buffers in the plurality of buffers therby assuring proper ordering of the peer-to-peer communication.

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