To smoothly integrate with the PCI standard, manufacturers of CardBus controllers have developed an industry standard for this type of PCI bridge. This standard defines a PCI header type field (82h), plus a set of required register definitions that represent the standard interface between the host software the controller. The Socket Services drivers for Microsoft Windows 95/98 are written to support this standard definition, even though it might not be formally approved by the PCI Special Interest Group (SIG). Because CardBus host controllers are PCI bus bridges, they will be supported (enumerated and configured) by the PCI software in Windows 95, just as other PCI bus bridges. The PCI bus bridge support was enhanced for Windows 95 OSR 2 and Windows 98 to support full, dynamic configuration of devices on arbitrary PCI topologies. This support is based on new requirements for PCI interrupt routing and bridge-window configuration currently in process at PCI SIG. Because of this, full compliance with the latest PCI requirements is required for CardBus support.
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