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Power, Reset, and Clock Management
Table 8-3. Module Idle Mode Settings (continued)
Idle Mode Value Selected Mode Description
The module acknowledges the idle
request basing its decision on its internal
activity. Namely, the acknowledge signal
is asserted only when all pending
0x2 Smart-idle
transactions, interrupts, or direct memory
access (DMA) requests are processed.
This is the best approach to efficient
system power management.
The module acknowledges the idle
request basing its decision on its internal
wakeup-capable mode activity. Namely,
the acknowledge signal is asserted only
when all pending transactions, interrupts,
or DMA requests are processed. This is
0x3 Smart-idle wakeup-capable mode the best approach to efficient system
power management. The module may
generate (IRQ- or DMA-request-related)
wake-up events when in IDLE state. The
mode is relevant only if the appropriate
module swakeup output(s) is
implemented.
The
idle
status
of
a
slave
module
is
indicated
by
the
CM_<Powerdomain>_<Module>_CLKCTRL[x]
IDLEST bit field in the PRCM module.
Table 8-4. Idle States for a Slave Module
IDLEST Bit VALUE Idle Status Description
The module is fully functional.The
0x0 Functional
interface and functional clocks are active.
The module is performing a wake-up or a
0x1 In transition
sleep transition.
The module interface clock is idled. The
0x2 Interface idle module may remain functional if using a
separate functional clock.
The module is fully idle. The interface and
0x3 Full idle
functional clocks are gated in the module.
For the idle protocol management on the PRCM module side, the behavior of the PRCM module is
configured
in
the
CM_<Power
domain>_<module>_CLKCTRL[x]
MODULEMODE
bit
field.
Based
on
the
configured behavior, the PRCM module asserts the idle request to the module unconditionally (that is,
immediately when the software requests).
Table 8-5. Slave Module Mode Settings in PRCM
MODULEMODE Bit VALUE Selected Mode Description
The PRCM module unconditionally asserts
the module idle request. This request
applies to the gating of the functional and
interface clocks to the module. If
0x0 Disabled
acknowledged by the module, the PRCM
module can gate all clocks to the module
(that is, the module is completely
disabled)..
0x1 Reserved NA
503
SPRUH73H–October 2011–Revised April 2013 Power, Reset, and Clock Management (PRCM)
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