Texas Instruments OMAP36 Series, Technical Reference Manual

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PRCM Integration
3.4.1 Power-Management Scheme, Reset, and Interrupt Requests
3.4.1.1 Power Domain
The PRCM module is in two power domains (see Table 3-5 ).
Table 3-5. PRCM Power Domains
PRCM Subsystem Modules Power Domain
PRM WKUP
CM CORE
The PRM module is in the WKUP power domain, which is continuously active. It is composed of the logic
that must be permanently supplied to manage domain power-state transitions and detect wake-up events.
The CM module is in the CORE power domain, which can be activated and deactivated according to the
requirements of the executing applications.
3.4.1.2 Resets
The PRM and CM modules are reset by independent reset signals (see Table 3-6 ).
Table 3-6. PRCM Reset Signals
PRCM Subsystem Reset Signal
PRM PRM_RSTPWRON
CM CM_RSTPWRON_RET
The PRM module is reset by the cold reset signal PRM_RSTPWRON. The CM module is reset by
assertion of the CM_RSTPWRON_RET signal.
The CM logic is reset on:
• Any global cold reset
• A CORE power domain transition from off to on
The PRM logic is reset on any global cold reset.
CM and PRM registers that are sensitive to a warm reset are also reset when a global warm reset occurs.
However, the CM and PRM logic is not reset.
NOTE: At global cold reset:
• Only the device finite state-machine (FSM) in the PRM operates on the 32-kHz clock,
and it is released from reset on the release of the global reset.
• PRM logic operates on the system clock and is released from reset on release of the
reset PRM_RSTPWRON.
Figure 3-19 shows the PRCM reset signals.
249 SWPU177N – December 2009 – Revised November 2010 Power, Reset, and Clock Management
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