Miscellaneous Rules
A Split Configuration Transaction Requires a Single Completion
If a configuration transaction is split, the Requester expects to receive one and only one Completion transaction containing the dword or less of requested read data.
An Issue For PCI Express-to-PCI or -PCI-X Bridges
If such a bridge receives a configuration request targeting a PCI or PCI-X function and the Extended Register Address field is non-zero, the bridge must return a UR (Unsupported Request) status to the Requester.
PCI Special Cycle Transactions
If software must cause a PCI Special Cycle transaction to be generated on a PCI or PCI-X bus, it takes the following actions.
To prime the Host/PCI bridge to generate a PCI Special Cycle transaction, software ...
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