ARM Cortex R4F User Manual
Page 239
Level Two Interface
ARM DDI 0363E
Copyright © 2009 ARM Limited. All rights reserved.
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Memory system implications for AXI accesses
The attributes of the memory being accessed can affect an AXI access. The L1 memory system
can cache any Normal memory address that is marked as either:
•
Cacheable, write-back, read- and write-allocate, non-shared
•
Cacheable, write-through, read-allocate only, non-shared.
However, Device and Strongly Ordered memory is always Non-cacheable. Also, any unaligned
access to Device or Strongly Ordered memory generates an alignment fault and therefore does
not cause any AXI transfer. This means that the access examples given in this chapter never
show unaligned accesses to Device or Strongly Ordered memory.