The world of semiconductors is moving towards heterogeneity, and the Universal Chiplet Interconnect Express (UCIe) standard is the key piece. It allows chiplets from different manufacturers, with different lithographies and purposes, to communicate within the same package as if they were one. It is the end of monolithic design and the beginning of a new modular era. 🧩
The physical layer that standardizes multichip chaos ⚙️
UCIe defines a physical layer (PHY) and a link protocol for communication between chiplets. It operates on organic substrates, silicon interposers, or silicon bridges, offering a bandwidth of up to 32 GT/s per lane in its first version. The architecture includes a protocol stack that supports both high-performance data streams and control traffic, with error correction and power management mechanisms. Its goal is for a TSMC AI chip to seamlessly communicate with a Samsung HBM memory.
When your CPU needs to talk to the neighbor's chip 🗣️
Imagine putting together in the same package a high-performance chiplet with another that is rather slow and hot. UCIe is the simultaneous interpreter that prevents them from throwing things at each other's heads. The standard ensures that, even if one comes from one foundry and the other from a competitor, they understand each other without needing a mediator. Like a shared apartment where each tenant has their quirks, but at least the plumbing works.