Power, Reset, and Clock Management
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Table 8-8. Clock Domain States
State Description
Every nondisabled slave module (that is, those whose
MODULEMODE value is not set to disabled) is put out of IDLE
state.
All interface clocks to the nondisabled slave modules in the
ACTIVE
clock domain are provided. All functional and interface clocks to
the active master modules (that is, not in STANDBY) in the clock
domain are provided. All enabled optional clocks to the modules
in the clock domain are provided.
This is a transitory state.
Every master module in the clock domain is in STANDBY state.
Every idle request to all the slave modules in the clock domain is
asserted. The functional clocks to the slave module in enabled
IDLE_TRANSITION
state (that is, those whose MODULEMODE values are set to
enabled) remain active.
All enabled optional clocks to the modules in the clock domain
are provided.
All clocks within the clock domain are gated.
Every slave module in the clock is in IDLE state and set to
disabled.
INACTIVE
Every slave module in the clock domain (that is, those whose
MODULEMODE is set to disabled) is in IDLE state and set to
disabled.
Every optional functional clock in the clock domain is gated
Each clock domain transition behavior is managed by an associated register bit field in the CM_<Clock
domain>_CLKSTCTRL[x] CLKTRCTRL PRCM module
Table 8-9. Clock Transition Mode Settings
CLKTRCTRL Bit Value Selected Mode Description
Sleep transition cannot be initiated.
0x0 NO_SLEEP
Wakeup transition may however occur.
A software-forced sleep transition. The
0x1 SW_SLEEP transition is initiated when the associated
hardware conditions are satisfied
A software-forced clock domain wake-up
0x2 SW_WKUP
transition is initiated
0x3 Reserved NA
8.1.4 Power Management
The PRCM module manages the switching on and off of the power supply to the device modules. To
minimize device power consumption, the power to the modules can be switched off when they are not in
use. Independent power control of sections of the device allows the PRCM module to turn on and off
specific sections of the device without affecting the others.
8.1.4.1 Power Domain
A power domain is a section (that is, a group of modules) of the device with an independent and dedicated
power manager (see Figure). A power domain can be turned on and off without affecting the other parts of
the device.
506
Power, Reset, and Clock Management (PRCM) SPRUH73H–October 2011–Revised April 2013
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