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some questions about dm8168 mmu

from the document "sprugx8.pdf", there are some words about MMU

1.5.1 MMU Overview
A memory management unit (MMU) is a hardware component responsible for handling accesses to
memory requested by a processing unit. MMU functions include translation of virtual addresses to physical
addresses (that is, virtual memory management).
The device contains the following MMUs:
• System MMU for C674x DSP and other requestors (please refer to the device specific data manual for other requestors)
• L1 Shared cache MMU and L2 MMU in Media Controller Subsystem
• ARM® Cortex™-A8 MMU
• SGX530™ MMU
But from the figure from the same document or another which name maybe "sprs614b.pdf"
Questions:
1) What's the "AMMU" in block "L2" in above figure? And which one does it refer to in the above four mmus?
2)In the dvr_rdk software platform, in file "AMMU_m3.cfg", initialize one module named "AMMU" in M3VPSS. Which mmu here means?