Nodes: The Players in the Network

The Request Node is the Master. It's usually a CPU core or a GPU. There are two types:

• RN-F (Fully Coherent): Has its own cache and can be snooped. Like a high-end ARM core.
• RN-I (IO Coherent): Does NOT have a cache that others can snoop. Like a simple DMA engine.

The Home Node is the "Manager" or "Hub". Every request goes here first. The HN decides who has the data and coordinates all the snoops.

The Slave Node is the destination, like the main DDR Memory. It just provides the data when the HN asks for it.