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 ...

Get PCI Express System Architecture now with O’Reilly online learning.

O’Reilly members experience live online training, plus books, videos, and digital content from 200+ publishers.