Appendix F: Hot Plug Support
The PCI Express defines the mechanism for hot-plug support for downstream ports and provides a "toolbox" of mechanisms that allow different user/operator models to be supported using a self-consistent infrastructure. This feature is applicable to Root Complex and switch downstream ports.
| Component | Purpose |
|---|---|
| Indicators | Show the power and attention state of the slot |
| Manually-operated Retention Latch (MRL) | Holds adapter in place |
| MRL Sensor | Allows the Port and system software to detect the MRL being opened |
| Electromechanical Interlock | Prevents removal of adapter from slot |
| Attention Button | Allows user to request hot-plug operations |
| Software User Interface | Allows user to request hot-plug operations |
| Slot Numbering | Provides visual identification of slots |
| Power Controller | Software-controlled electronic component or components that control power to a slot or adapter and monitor that power for fault conditions |
The Interface signals required to connect the Controller to the Hot-Plug Slot are as follows:
