Argo: A Real-Time Network-on-Chip Architecture With an Efficient GALS Implementation

Evangelia Kasapaki, Martin Schoeberl, Rasmus Bo Sørensen, Christoph Müller, Kees Goossens, Jens Sparsø

Research output: Contribution to journalJournal articleResearchpeer-review


In this paper, we present an area-efficient, globally asynchronous, locally synchronous network-on-chip (NoC) architecture for a hard real-time multiprocessor platform. The NoC implements message-passing communication between processor cores. It uses statically scheduled time-division multiplexing (TDM) to control the communication over a structure of routers, links, and network interfaces (NIs) to offer real-time guarantees. The area-efficient design is a result of two contributions: 1) asynchronous routers combined with TDM scheduling and 2) a novel NI microarchitecture. Together they result in a design in which data are transferred in a pipelined fashion, from the local memory of the sending core to the local memory of the receiving core, without any dynamic arbitration, buffering, and clock synchronization. The routers use two-phase bundled-data handshake latches based on the Mousetrap latch controller and are extended with a clock gating mechanism to reduce the energy consumption. The NIs integrate the direct memory access functionality and the TDM schedule, and use dual-ported local memories to avoid buffering, flow-control, and synchronization. To verify the design, we have implemented a 4 x 4 bitorus NoC in 65-nm CMOS technology and we present results on area, speed, and energy consumption for the router, NI, NoC, and postlayout.
Original languageEnglish
JournalI E E E Transactions on Very Large Scale Integration (VLSI) Systems
Issue number2
Pages (from-to)479-492
Publication statusPublished - 2016


  • Asynchronous design
  • Multiprocessor interconnection networks
  • Real-Time Systems
  • Time-division multiplexing (TDM)


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