Power Control
ARM DDI 0301H Copyright © 2004-2009 ARM Limited. All rights reserved. 10-2
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10.1 About power control
The features of the processor that improve energy efficiency include:
• support for Intelligent Energy Management (IEM)
• accurate branch and return prediction, reducing the number of incorrect instruction fetch
and decode operations
• use of physically addressed caches to reduce the number of cache flushes and refills,
saving energy in the system
• the use of MicroTLBs reduces the power consumed in translation and protection look-ups
each cycle
• the caches use sequential access information to reduce the number of accesses to the
TagRAMs and to unwanted Data RAMs.
In the processor extensive use is also made of gated clocks and gates to disable inputs to unused
functional blocks. Only the logic actively in use to perform a calculation consumes any dynamic
power.
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