AMBA C2C: Moving Forward With A Converged AMBA Foundation For C2C Connectivity

Arm's push to extend CHI coherency beyond the die boundary is not a protocol upgrade—it is a structural expansion of its IP licensing model. The revenue engine shifts from selling cores to selling the interconnect layer, fundamentally repricing per-chip license fees. The technical ripple runs deeper than the surface. Once snoop-based CHI coherence operates across die, packaging-layer signal-integrity demands approach SerDes-class requirements; CoWoS-L and Foveros Direct bump pitches must be recalibrated. EDA toolchains will need new formal-verification scenarios for cross-die CHI transactions, spawning an entirely new verification-IP market. The competitive battleground is UCIe. Intel, AMD, Samsung, and SK Hynix are betting on an open architecture. Arm's moat is protocol-as-ecosystem: adopt Neoverse and you inherit CHI/C2C. But if the RISC-V camp—SiFive, Andes Technology in Taiwan, China—collectively pivots to UCIe, Arm's interconnect monopoly window may close within 18 to 24 months. 12-to-24-month outlook: expect a C2C Lite trimmed protocol subset targeting automotive and IoT chiplet markets, plus deep coupling with Marvell and Broadcom custom-ASIC teams. The real long-tail risk is protocol fragmentation. Chiplet interconnect will replay the USB-versus-FireWire standards war. The winner will not be the technically superior protocol but the thickest ecosystem. Arm is betting on being that ecosystem.