PCIPCI-X bus bridge with performance monitor

专利名称：PCI/PCI-X bus bridge with performance

monitor

发明人：Pat Allen Buckland,Daniel Marvin

Neal,Steven Mark Thurber

申请号：US09583712申请日：20000531公开号：US06715011B1公开日：20040330

专利附图：

摘要：A bus bridge for use in a data processing system is disclosed in which the bridgeincludes a primary bus interface coupled to a primary bus, a secondary bus interface

coupled to a secondary bus, a performance monitor register; and a state machineconnected to the primary and secondary bus interfaces and configured to record theoccurrence of a specified event in the performance monitor register. In a host bridgeembodiment of the bridge, the primary bus is a host bus of the data processing systemand the secondary bus is a PCI bus or PCI-X bus. The bridge may monitor events such asaccepting a posted memory write (PMW), accepting with split response a read request(RR), retrying a PMW, retrying a RR, disconnecting a PMW when the bridge is a target ofthe operation, and accepting a PMW, accepting a split read completion operation (SRC),accepting a RR with split response, accepting a split write request operation (SWR) withsplit response, retrying a PMW, retrying a RR, retrying a SWR, retrying a SRC, anddisconnecting a SRC when the bridge is a master. In a PCI-X to PCI-X embodiment of thebridge, the bridge may monitor the primary, and secondary busses are PCI-X or PCIbusses and the events monitored including accepting a PMW, accepting a SRC, acceptinga RR with spilt response, accepting a SWR with split response, retrying a PMW, retrying aRR, retrying a SWR, retrying a SRC, disconnecting a PMW, and disconnecting a SRC whenthe bridge is a target and accepting a PMW, accepting a SRC, accepting a RR with splitresponse, accepting a SWR with split response, accepting a RR with immediate response,accepting a SWR with immediate response, retrying a PMW, retrying a RR, retrying a SWR,retrying a SRC, disconnecting a PMW, and disconnecting a SRC when the bridge is amaster. In either embodiment, the bridge may further include a mode registercorresponding to each performance monitor register where the value of the moderegister determines the specified activity monitored by the corresponding performancemonitor register.

申请人：INTERNATIONAL BUSINESS MACHINES CORPORATION

代理人：Joseph P. Lally,Mark E. McBurney

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