Power, Reset, and Clock Management
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8.1.4.2 Power Domain Management
The power manager associated with each power domain is assigned the task of managing the domain
power transitions. It ensures that all hardware conditions are satisfied before it can initiate a power domain
transition from a source to a target power state
Table 8-12. Power Domain Control and Status Registers
Register/Bit Field Type Description
Selects the target power state of the
PM_<Power domain>_PWRSTCTRL[1:0]
Control power domain among OFF, ON, or
POWERSTATE
RETENTION.
Identifies the current state of the power
PM_<Power domain>_PWRSTST[1:0]
Status domain. It can be OFF, ON, or
POWERSTATEST
RETENTION.
Identifies the current state of the logic
PM_<Power domain>_PWRSTST[2]
Status area in the power domain. It can be OFF
LOGICSTATEST
or ON.
Identifies the current state of the memory
PM_<Power domain>_PWRSTST[5:4]
Status area in the power domain. It can be OFF,
MEMSTATEST
ON, or RETENTION
8.1.4.2.1 Power-Management Techniques
The following section describes the state-of-the-art power-management techniques supported by the
device.
8.1.4.2.1.1 Adaptive Voltage Scaling
AVS is a power-management technique based in Smart Reflex that is used for automatic control of the
operating voltages of the device to reduce active power consumption. With Smart Reflex, power-supply
voltage is adapted to silicon performance, either statically (based on performance points predefined in the
manufacturing process of a given device) or dynamically (based on the temperature-induced real-time
performance of the device). A comparison of these predefined performance points to the real-time on-chip
measured performance determines whether to raise or lower the power-supply voltage. AVS achieves the
optimal performance/power trade-off for all devices across the technology process spectrum and across
temperature variation. The device voltage is automatically adapted to maintain performance of the device
508
Power, Reset, and Clock Management (PRCM) SPRUH73H–October 2011–Revised April 2013
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