Universal Chiplet Interconnect Express (UCIe™) PHY

Overview

High-bandwidth, low-power and low-latency standardized die-to-die interconnect

The UCIe™ PHY is a high-bandwidth, low-power and low-latency die-to-die solution that enables multi-die system in package integration for high performance compute, AI/ML, 5G, automotive and networking applications. The UCIe™ physical layer includes the link initialization, training, power management states, lane mapping, lane reversal, and scrambling. The UCIe™ controller includes the die-to-die adapter layer and the protocol layer. The adapter layer ensures reliable transfer through link state management and parameter negotiation of the protocol and flit formats. The UCIe™ architecture supports multiple standard protocols such as PCIe, CXL and streaming raw mode.

Key Features

  • Supports up to 32Gbps per pin including 4/8/12/16/24Gbps
  • Forwarded clock, track, and valid pins
  • Sideband messaging for link training and parameter exchange
  • KGD (Known Good Die) testing capability
  • Redundant lane repair (advanced)
  • Width degradation (standard)
  • Lane reversal
  • Supports advanced and standard package designs with up to 25mm channel reach
  • Silicon measured low raw BER as low as 1E-27 compared to spec of 1E-15
  • Simplified clock management with integrated PLL
  • Hardware-bringup with no firmware required

Benefits

  • Package Flexibility: Supports standard package (2D) and advanced package (2.5D)
  • Power Efficiency: Advanced architecture meets ultra-low power requirements
  • Low Latency: For data-intensive applications
  • High Performance Reliability: Efficient design for maximum die-to-die throughput and link data integrity
  • Multi-protocol Solution: Supports CXS, CHI C2C, AXI, PCIe, CXL, and streaming protocols
  • Interoperability: KGD and robust test methods ensure seamless link reliability

Block Diagram

Universal Chiplet Interconnect Express (UCIe™) PHY Block Diagram

Technical Specifications

TSMC
Pre-Silicon: 3nm
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Semiconductor IP