Cortex-A9 MPCore Technical Reference Manual: 5.3.3. Cortex-A9 MPCore power domains

The Cortex-A9 MPCore processor can support up to fourteen power domains:

four power domains, one for each of the Cortex-A9 processors, apart from their Data Engines
four power domains, one for each of the Cortex-A9 processor Data Engines
four power domains, one for each of the Cortex-A9 processor caches and TLB RAMs
one power domain for SCU duplicated TAG RAMs
one power domain for remaining logic, the SCU logic cells, and private peripherals.

Figure 5.2 shows the power domains and where placeholders are inserted for power domain isolation.

Figure 5.2. Cortex-A9 MPCore power domains and clamps

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