Timer control for peripheral component interconnect express components implemented with thunderbolt controllers

摘要

Aspects of the embodiments are directed to systems, methods, and devices for controlling power management entry. A PCIe root port controller can be configured to receive, at a downstream port of the root port controller, from an upstream switch port, a first power management entry request; reject the first power management entry request; transmit a negative acknowledgement message to the upstream switch port; initiate a timer for at least 20 microseconds; during the 20 microseconds, ignore any power management entry requests received from the upstream switch port; receive, after the expiration of the 20 microseconds, a subsequent power management entry request; accept the subsequent power management entry request; and transmit an acknowledgement of the acceptance of the subsequent power management entry request to the upstream switch port.