UCIe Controller (AXI Protocol + Adapter)

The UCIe Controller consists of Universal Chiplet Interconnect Express (UCIe) Die-to-Die (D2D) Adapter and Protocol Layers. The UCIe Protocol Layer is located between SoC logics and UCIe D2D Adapter Layer, handles the UCIe Protocol Layer functions. The SoC logics communicate with UCIe Protocol Layer via the AXI interface. The Adapter Layer coordinates with the Protocol Layer and the Physical Layer to ensure successful data transfer across the UCIe Link. The Adapter Layer is responsible for coordinating higher-level link state machine, managing the link bring-up process, and exchanging parameters related to protocol options with the remote link partner. The UCIe Controller supports Streaming Protocol.

• Supports AXI4
• Supports the backpressure mechanism of transmission
• Supports AXI read/write timeout monitor, and provides the timeout transaction address/ID information for debugging
• Supports latency-optimized 256B flit format with optional bytes for Streaming Protocol
• Supports flit generation and extraction
• Supports clock domain crossings between the AXI clock and UCIe clock
• Compliant with the UCIe Specification 1.1
• Supports 32/64B for FDI and RDI data width
• Supports 32 bits for FDI and RDI CFG width
• Supports the APB4 interface with a 32-bit address and 32-bit data bus for local register access
• Supports configurable ATU region, with 4 fixed sets of user-defined configurations