ARM R4 Manuale Utente
Power Control
ARM DDI 0363E
Copyright © 2009 ARM Limited. All rights reserved.
10-2
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Non-Confidential, Unrestricted Access
10.1
About power control
The features of the processor that improve energy efficiency include:
•
branch and return prediction, reducing the number of incorrect instruction fetch and
decode operations
decode operations
•
the caches use sequential access information to reduce the number of accesses to the tag
RAMs and to unwanted data RAMs.
RAMs 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.
functional blocks. Only the logic actively in use to perform a calculation consumes any dynamic
power.