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2.4.4. Cortex-A9 voltage domains

The Cortex-A9 processor can have the following power domains:

  • Cortex-A9 processor logic cells

  • Cortex-A9 processor data engines

  • Cortex-A9 processor RAMs.

Figure 2.4 shows the power domains.

Figure 2.4. Power domains for the Cortex-A9 processor

Figure 2.4. Power domains for the Cortex-A9 processor

The FPU is part of the processor power domain. The FPU clock is based on the processor clock. There is static and dynamic high-level clock-gating. NEON SIMD data paths and logic are in a separate power domain, with dedicated clock and reset signals. There is static and dynamic high-level clock-gating.

When NEON is present, you can run FPU (non-SIMD) code without powering the SIMD part or clocking the SIMD part.

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