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PRCM Overview
3.2
PRCM Overview
This section describes all modules and features in the high-tier device. To save power, ensure that power
domains of unavailable features and modules are switched off and clocks are cut off.
3.2.1 Introduction
The power-management framework of the device significantly reduces dynamic power consumption and
static leakage current to extend the life of the battery in the end product. This framework incorporates
support for state-of-the-art power-management techniques. It ensures optimal device operation with
significantly reduced power consumption. The PRCM module, which is the enhanced power-management
subsystem of the device, is the central control module for the clock, reset, and power-management signals
in the device.
The device supports the power-management techniques with the following features:
•
Partitioning of the device into 16 voltage domains and 18 power domains
•
Domain isolation that allows any combination of domain on/off states
•
Clock tree with selective clock-gating conditions
•
Hardware-controlled reset sequencing management
•
Power, reset, and clock control hardware mechanism to manage sleep and wake-up dependencies of
power domains
•
Support for hardware-controlled autogating of module clocks
•
Memory retention capability for preserving memory contents in low-power sleep mode
•
Scalable voltage and frequency support for the processors, CORE, and peripherals for DVFS
•
SmartReflex adaptive voltage scaling for real-time performance adjustments
•
Support for low-power device off mode input/output (I/O) pad configuration for minimum power
consumption when in off power state
The PRCM module interfaces with all the components of the device for power, clock, and reset
management through power-control signals. It integrates enhanced features to let the device adapt energy
consumption dynamically according to changing application and performance requirements. The
innovative hardware architecture allows a substantial reduction in leakage current.
The PRCM module is composed of two main entities:
•
Power reset manager (PRM): Handles power, reset, wake-up management, and system clock source
control (oscillator)
•
Clock manager (CM): Handles clock generation, distribution, and management
The PRCM module is fully configurable through its L4 interface port.
is an overview of the PRCM module and its internal connections with a generic power domain.
239
SWPU177N – December 2009 – Revised November 2010
Power, Reset, and Clock Management
Copyright © 2009–2010, Texas Instruments Incorporated