3.4. Constellation


Constellation is a Chisel NoC RTL generator framework designed from the ground up to support integration in a heterogeneous SoC and evaluation of highly irregular NoC architectures.

  • Constellation generates packet-switched wormhole-routed networks with virtual networks and credit-based flow control

  • Constellation supports arbitrary directed graph network topologies, including irregular and hierarchical network topologies

  • Constellation includes a routing algorithm verifier and routing-table compiler, which can verify and generate deadlock-free routing tables for arbitrary topologies

  • Constellation is a protocol-independent transport layer, yet is capable of compliant deadlock-free transport of protocols like AXI-4 and TileLink

  • Constellation supports drop-in integration in Chipyard/Rocketchip SoCs

  • Constellation is rigorously tested, with almost 100 different tests across as many network configurations

Constellation is fully integrated into Chipyard, and can be used to generate almost any interconnect in a Chipyard/Rocketchip-based SoC.

For documentation on Constellation, see its documentation pages.