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ARM DDI 0363E Copyright © 2009 ARM Limited. All rights reserved. 5-1
ID013010 Non-Confidential, Unrestricted Access
Chapter 5
Prefetch Unit
This chapter describes how the PreFetch Unit (PFU), in conjunction with the DPU, uses program
flow prediction to locate branches in the instruction stream and the strategies used to determine if
a branch is likely to be taken or not. It contains the following sections:
• About the prefetch unit on page 5-2
• Branch prediction on page 5-3
• Return stack on page 5-5.