Power Management (PM) Module - 2020.2 English

Zynq UltraScale+ MPSoC Software Developer Guide (UG1137)

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2020.2 English

Zynq UltraScale+ MPSoC Power Management framework is based on an implementation of the Embedded Energy Management Interface (EEMI). This framework allows software components running across different processing units (PUs) on a chip or device to issue or respond to requests for power management.

The Power Management module is implemented within the PMU firmware as an event-driven module. Events processed by the Power Management module are called power management events. All power management events are triggered via interrupts.

When handling an interrupt the PMU firmware determines whether the associated event shall be processed by the Power Management module. Accordingly, if the PMU firmware determines that an event is power management related and if the Power Management module is enabled, the PMU firmware triggers it to process the event.

For example, all the PS and PL interrupts can be routed to the PMU via the GIC Proxy. When the application processors (APU or RPU) are temporarily suspended, the PMU handles the GIC Proxy interrupt and wakes up the application processors to service the original interrupts. The PMU firmware does not actually service these interrupts, although you are free to customize the PMU firmware so that these interrupts are serviced by the PMU instead of by the application processors. For more information, see the ‘Interrupts’ chapter of the Zynq UltraScale+ Device Technical Reference Manual (UG1085).

When processing a power management event the Power Management controller may exploit the PMU ROM handlers for particular operations regarding the state control of hardware resources. Warm restart and FPGA configuration manager are part of Power Management module. PMU firmware includes XilFPGA and XilSecure libraries to support the functionalities of PL FPGA configuration and to access secure features respectively. See Power Management Framework for more information.

Note: Since the Power Management module uses base firmware APIs such as IPI manager/event manager, it is not possible to run standalone power management features without PMU firmware. See PM Examples wiki page for XilPM based design examples.