Toggle for split transaction mode of pci-x bridge buffer

Details Toggle for split transaction mode of pci-x bridge buffer Toggle for split transaction mode of pci-x bridge buffer

G - Physics

06

F

G06F 13/14 (2006.01) G06F 13/12 (2006.01) G06F 13/16 (2006.01) G06F 13/36 (2006.01) G06F 13/364 (2006.01) G06F 13/38 (2006.01)

Patent

CA 2302077

A system and method for optimally processing split request transactions across a PCI-X bridge with a PCI-X bridge buffer. The split transaction mode of the PCI-X bridge buffer is toggled between a No Over-commit mode and an over-commit mode. Over-commitment of the buffer is inhibited when the split transaction mode is toggled to the No Over-commit mode and when the buffer is over committed by the bridge. At least some over-commitment of the buffer is allowed by the bridge when the split transaction mode is toggled to the over-commit mode and when the buffer is not over committed by the bridge. The over-commit mode may be an Over- commitment mode or a Flood mode. The Over-commitment mode allows some degree of over commitment of the buffer by the bridge while the Flood mode allows the bridge to forward all split request transactions regardless of size of the transactions or amount of available space in the buffer when the Over-commit mode is in a Flood mode. The split request transaction is controlled and forwarded based on the toggled split transaction mode. The system comprises at least a toggle switch and a control system. The split transaction mode is toggled to or maintained at a particular mode based on whether a retry or disconnect of the split completion transaction by the PCI-X bridge has or has not occurred and whether the buffer is or is not over committed.

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