Supporting Subtractive PCI-to-PCI Bridges in WindowsUpdated: April 30, 2004
File name: PCIbridge-subtr.doc
About This DownloadThis paper provides information about how the Microsoft Windows family of operating systems handle subtractive PCI-to-PCI bridges. It provides guidelines for device manufacturers and driver developers to understand how Windows supports PCI-to-PCI bridges. A bridge that is fully compliant with the PCI-to-PCI bridge specification can support both subtractive and positive decode types. However, Windows 2000, Windows XP, and Windows Server 2003 do not fully support these bridge types. Current plans are to include support for these subtractive bridges in Windows Vista. Similar to routing networking packets across a network, PCI transactions and requests are forwarded across a PCI bridge. To understand how a particular type of bridge routes requests, you must first understand resource arbitration and the address decoding method associated with a particular type of bridge. You must also understand decode windows and address decoding. The content of this paper assumes that reader is familiar with the basics of PCI-to-PCI bridges, including familiarity with the PCI-to-PCI Bridge Architecture Specification, revision 1.2. This information in this paper applies for the following operating systems: Included in this white paper:
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