PHY · Physical Layer
The physical-layer interface of a link, whether an Ethernet port or a die-to-die crossing; its ecosystem maturity, power, and silicon area often decide build-now versus wait-for-new-silicon.
Also written as: PHYs
Current numbers
>20 Tbps/mmUCIe 3.0 signaling reaches 64 GT/s; a third-party 64 Gbps PHY demonstration exceeds 20 Tbps/mm edge density, while UCIe-3D reaches up to ~300 TB/s/mm² at 1 µm pitch
1e-12Legacy ibdiagnet v2.13.0 --ber_test default; later devices use the supported PHY path