The node controller receives {HEAD ~ transactions} from {TAIL ~ a master device}, communicates with a master device as another master device or as a slave device, and queues transactions received from a master device 
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The node controller receives { HEAD ~ transactions } from { TAIL ~ a master device } , communicates with a master device as another master device or as a slave device , and queues transactions received from a master device
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH