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2.4.1. Energy efficiency features

The features of the Cortex-A9 processor that improve energy efficiency include:

  • accurate branch and return prediction, reducing the number of incorrect instruction fetch and decode operations

  • the use of physically addressed caches, reducing the number of cache flushes and refills, saving energy in the system

  • the use of micro TLBs reduces the power consumed in translation and protection lookups for each cycle

  • caches that use sequential access information to reduce the number of accesses to the tag RAMs and to unnecessary accesses to data RAMs

  • instruction loops that are smaller than 64 bytes often complete without additional instruction cache accesses, so lowering power consumption.

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