A reconfigurable processing unit is disclosed, comprising a first internal network and a second internal network with different protocols, an interface to an external network with a different protocol, a first configurable unit sending a request to access an external memory over the first internal network, a second configurable unit receiving the request on the first internal network, obtaining a memory address, determining an identifier for the target reconfigurable processing unit, and sending the request, identifier, and memory address over the second internal network, and a third configurable unit receiving the request, identifier, and memory address on the second internal network, determining a routable address on the external network based on the identifier, synthesizing a payload with the request, address, and identifier, and sending the payload to the routable address on the external network.