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CHI to UCIe Bridge IP
Design IP
Overview

SmartDV’s CHI to UCIe Bridge IP enables seamless protocol translation between Arm’s Coherent Hub Interface (CHI) and the Universal Chiplet Interconnect Express (UCIe) standard, facilitating high-bandwidth, low-latency communication in multi-die and chiplet-based designs. This bridge IP is ideal for next-generation SoCs requiring cache-coherent communication across die boundaries while leveraging the open UCIe ecosystem.

Designed for flexibility, the IP core is highly configurable to meet specific design requirements, supporting both ASIC and FPGA implementations while optimizing for area, power, and performance. Its modular architecture ensures easy integration into diverse system architectures, helping accelerate time-to-market for advanced heterogeneous computing platforms.

Benefits
  • Seamless Chiplet Interoperability – Bridges AMBA CHI-based SoCs with UCIe-compliant chiplets, supporting UCIe versions 1.0, 1.1, and 2.0 for multi-die integration
  • High-Speed Data Exchange – Supports link speeds of 4, 8, 12, 16, 24, and 32 GT/s with UCIe clock frequencies up to 4 GHz and sideband speeds up to 800 MHz
  • Protocol Translation with Integrity – Maintains CHI protocol semantics across Request, Home, and Slave Nodes with full support for CHI-D transaction types, opcodes, flow control, and cache coherency
  • Configurable for System Needs – Offers flexible lane configurations (16, 32, 64 lanes), supports Endpoint and Root Complex modes, and accommodates Standard and Advanced UCIe packages
  • Flit Format & Retry Support – Enables raw and streaming protocol flit formats including latency-optimized 256B formats, with CRC, retry, and flit delay support for robust data handling
  • Advanced SoC and Cache Control – Includes fine-grain transaction-level control, programmable cache models with speculative reads, stashing, snoop filtering, and protocol-level reorder and retry features
  • Optimized for Integration – Includes standard bus interfaces and CHI-to-UCIe handshake, sideband messaging, mailbox access, link initialization retry, and vendor-defined message support
Compliance and Compatibility
  • Fully compliant with UCIe 1.0, 1.1, and 2.0 specifications and ARM AMBA5 CHI protocol
  • Compatible with Standard and Advanced UCIe packages, in both Root Complex and Endpoint modes
  • Compatible with all major EDA synthesis, simulation, and linting flows