An embodiment includes a communication medium coupled to a plurality of the functional blocks in an integrated circuit. Three or more of the initiator functional blocks communicate with a target functional block by sending requests having an associated identifier to indicate a transaction stream that the request is part of. At least a first and a second of buffer are associated with the target functional block at an interface of the target functional block to the communication medium and receive requests having the associated identifiers from the three or more initiator functional blocks through a shared common connection point for the interface. The communication medium implements a mapping algorithm to map requests from a first initiator functional block as well as requests from a third initiator functional block to a first dedicated buffer based on the associated identifiers. The mapping algorithm also maps requests from a second initiator functional block to a second buffer based on the associated identifier.