Power Management Unit Bus Transaction Control

The power management unit performs preliminary detection of bus transaction states before powering down the switchable power domain. By checking whether a bus transaction is already in progress and determining its completion status beforehand, the system can safely power down only when no transactions are active, preventing data corruption while still achieving energy savings.

Before powering down the switchable power domain for thermal management, the power management unit preliminarily detects the state of bus transactions. By identifying incomplete transactions in advance and preventing power down during their execution, the system avoids system freezes while still achieving effective thermal management through selective power down when safe.

The power management unit serves as an intermediary between the switchable power domain and the always-on power domain. It monitors bus transaction states and controls the power down timing, acting as a mediator that prevents data corruption without requiring complex modifications to the existing bus protocol or transaction mechanisms. The intermediary approach maintains simplicity by centralizing the monitoring and control logic in a dedicated power management unit.