Why SoC Interconnects Have Outgrown the Bus

This technical white paper explores why modern AI, automotive, and chiplet-based SoCs are outgrowing traditional interconnects and how advanced NoC architectures and coherent subsystem IP can address the industry’s next-generation scalability, safety, and performance challenges.

The shared-bus and crossbar interconnects that served the SoC industry for two decades are running out of room. AI accelerator workloads demand heterogeneous coherency at agent counts where broadcast-snoop fabrics collapse. Automotive ADAS and EV platforms require ISO 26262 ASIL-D safety mechanisms designed into the interconnect, not bolted on. Chiplet disaggregation through UCIe 2.0 means coherency must now cross die boundaries cleanly. And at 3nm and 2nm, crossbar arbitration paths are already failing to close.

This white paper examines each of these forces in detail, explains the structural reasons packet-switched NoC fabrics with directory-based coherency address them, and presents the SignatureIP Compute and I/O Subsystem IP portfolio — C-NOC, NC-NOC, AXI2CHI, CHI2AXI, ATC, Proxy Cache, Ethernet, and Inoculator — that SoC teams can use to make the transition today.

Read more here.

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