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The Infinity Scalable Data Fabric (SDF) is the data communication plane of the Infinity Fabric. All data from and to the cores and to the other peripherals (e.g. memory controller and I/O hub) are routed through the SDF. A key feature of the coherent data fabric is that it's not limited to a single die and can extend over multiple dies in an MCP as well as multiple sockets over PCIe links (possibly even across independent systems, although that's speculation). There's also no constraint on the topology of the nodes connected over the fabric, communication can be done directly node-to-node, island-hopping in a bus topology, or as a mesh topology system.
