2.8 Power control infrastructure

Low-power operation is essential for IoT endpoint devices which might rely on a battery or on harvested energy. SSE-200 uses two key methods to reduce the overall power of the system:

  • Dynamic hierarchical clock control to reduce dynamic power.
  • Multiple power-gated regions in the design to reduce leakage power.

Each power domain contains a Power Integration Kit (PIK) that performs the following:

  • Integrates a Power Policy Unit (PPU) that provides technology-independent power control of the domain.
  • Integrates Q-Channel and P-Channel infrastructure components to bring together the quiescent status and control of key IP blocks within the power domain to the PPU.

The PIK of each domain is primarily designed to deal with the power control of its associated power domain. However, some power domains are aware of the power state of other power domains, to maintain the correct operation of the system. The Power Dependency Control Matrix (PDCM) enables software to configure the relationship between each power domain.

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