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PCI Express System Architecture by MindShare, Inc, Ravi Budruk, Don Anderson, Tom Shanley

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The Power Budgeting Elements

Figure 15-2 illustrates the concept of Power Budgeting for hot plug cards. The role of each element involved in the power budgeting, allocation, and reporting process is listed and described below:

  • System Firmware Power Management (used during boot time)

  • Power Budget Manager (used during run time)

  • Expansion Ports (ports to which card slots are attached)

  • Add-in Devices (Power Budget Capable)

Figure 15-2. Elements Involved in Power Budget

System Firmware — System firmware, having knowledge of the system design, is responsible for reporting system power information. The specification recommends the following power information ...

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