82870P2P64H2 Datasheet, PDF (170/217 Pages) –

Functional Description
R
4.7.2
Configuration Access Arbitration
If the processor is currently accessing a device, the SMBus cannot access the device (i.e., the first
in wins the arbitration). The other agent is stalled until the first agent finishes. The micro-
architecture of this area is critical. The reason for the SMBus interface is to access registers when
the system may be unstable or locked, which can result with broken queues. Any register access
through SMBus must be able to proceed while the system is stuck.
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Intel^® 82870P2 P64H2 Datasheet