An integrated circuit includes a plurality of tiles, and a plurality of interface modules coupled to the switches of a subset of the tiles. Each tile comprises a processor, and a switch including switching circuitry to forward data over data paths from other tiles to the processor and to switches of other tiles. At least some of the interface modules are configured to multiplex data from one or more parallel communication links of the switch to an multiplexed communication link having reduced parallelization, and mediate between a network protocol of the switch and a communication protocol of the multiplexed communication link.