[see: http://en.wikipedia.org/wiki/Advanced_Microcontroller_Bus_Architecture] has been interoperable with
PCI Express (PCIe) for several years now. These are related documentation that helps understanding
how it works:
1. Designing an AMBA-based SoC with a PCI Express Interface,
2. Building a Bridge from PCI Express to AMBA 3 AXI On-Chip Bus,
3. This one is even more interesting: Implementing a PCI-Express AMBA interface controller on a Spartan6 FPGA, link: http://publications.lib.chalmers.se/records/fulltext/176608/176608.pdf
This shows how far the layered design of PCIe could interoperate with AMBA bus from ARM.
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