Hi,
These are the AMBA specification from ARM ACE, ACE-Lite, AXI4, AXI4-Lite, AXI4-Stream, AXI3, AXI3-Lite, ATB, AHB, AHB-Lite and APB protocols.
You can refer ARM's this link for more details. http://infocenter.arm.com/help/index.jsp
Click the AMBA in the above link.