SPRUIU1C July 2020 – February 2024 DRA821U , DRA821U-Q1
Power management architecture of the device is built over three levels of power controls: clock-, power-, and voltage supplies to the subsystem modules, namely domains. A domain is a group of modules or subsections of the device that share a common entity (for example, common clock source, common voltage source, or common power switch).
A set of Power Domains (PD) are defined for the device, where clock and power supplies to the domain may be controlled by Power Sleep Controllers (PSC), see Section 5.2.2.3.1, Power Sleep Controller and Local Power Sleep Controllers. This section describes functionality of PSC, as well as list of power domains, control registers and hierarchical dependencies of PDs.
One or multiple power domains may share a single power supply, this level of grouping are referred as Voltage Domains (VD). Some voltage domains may be turned off by externally switching off the power supplies to these domains. Section 5.2.2.3.1.3.1, WKUP_PSC0 Device-Specific Information, and Section 5.2.2.3.1.3.1, PSC0 Device-Specific Information, give list of VDs and corresponding PDs on them.
Device power states are defined based on the combination of VD and PD ON/OFF states, as described in Section 5.2.3, Device Power States
Initial configuration of the device clocking tree and power domains, as well as power state transitions, may be complex due to hierarchical dependencies. Thus a Device Management and Security Controller (DMSC) is integrated to off-load some of these tasks from main controllers. DMSC also serves as a wake-up controller and generator, maintaining minimum hardware state machines when all programmable cores are turned off. Power management functions of the DMSC are described in Section 5.2.2.3.2, Integrated Power Management (DMSC), for functional reference. Standard applications shall use the DMSC Firmware APIs to perform high-level power management functions.
Additional hardware modules for temperature sensing, thermal management, power monitoring, and reset functions related to power ramping, are described in Section 5.2.2.2, Power System Modules.
Figure 5-641 shows the overview of the common power management of the device.