Primer on Configuration Software
The PCI Bus PM Interface Specification describes how to implement the PCI PM registers that are required in PCI Express. These registers permit the OS to manage the power environment of both PCI and PCI Express functions.
Rather than immediately diving into a detailed nuts-and-bolts description of the PCI Bus PM Interface Specification, it's a good idea to begin by describing where it fits within the overall context of the OS and the system. Otherwise, this would just be a disconnected discussion of registers, bits, signals, etc. with no frame of reference.
Basics of PCI PM
The most popular OSs currently in use on PC-compatible machines are Windows 98/NT/2000/XP. This section provides an overview of how the OS ...