SPNS174
–
SEPTEMBER 2011
4 System Information and Electrical Specifications
4.1
Device Power Domains
The device core logic is split up into multiple power domains in order to optimize the power for a given
application use case. There are 8 core power domains in total: PD1, PD2, PD3, PD4, PD5, RAM_PD1,
RAM_PD2 and RAM_PD3.
The actual contents of these power domains are indicated in .
PD1 is an "always-ON" power domain, which cannot be turned off. Each of the other core power domains
can be turned ON/OFF one time during device initialization as per the application requirement. Refer to
the Power Management Module (PMM) chapter of the device technical reference manual for more details.
NOTE
The clocks to a module must be turned off before powering down the core domain that
contains the module.
NOTE
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2011, Texas Instruments Incorporated
System Information and Electrical Specifications
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The logic in the modules that are powered down loses its power completely. Any access to
modules that are powered down results in an abort being generated. When power is
restored, the modules power-up to their default states (after normal power-up). No register or
memory contents are preserved in the core domains that are turned off.
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