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