Clustering coefficient: the most intuitive explanation is the number of hops between two random nodes in the network.
Layers
Physical layer
Link layer
Transaction protocol: such as AXI
Seperated channels like AXI, to avoid dead-lock caused by depency problem
Transport layer
Packet: header & payload
Flow control
On link-level or end-to-end level
Link-level: every hop there is a notification, just like valid-ready protocol
End-to-end level: every transaction of data from sender to receiver has to have some kind of notification that the receiver notify the sender it has received the data successfully.
Advantages:
Multiple transactions can complete in parallel in the network to utilize the routing resource.
Layered structure makes it more clear, and each layer can be implemented independently.
