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With physical limitations slowing Moore¡¯s law and AI pushing the limits of technology, compute requirements and the demand for more processing power have grown exponentially. Modern data centers now require multi-die designs to power generative AI applications, driving many technology requirements including high-bandwidth and low-power die-to-die connectivity.

To ensure multi-die design success, the Universal Chiplet Interconnect Express (UCIe) specification streamlines die-to-die connectivity in multi-die designs by prioritizing interoperability, keeping latency down, enabling disparate dies to communicate with each other, and more.

²ÝÁñÉçÇø continues to stand at the forefront of the UCIe evolution. From teaming up with Intel on the world¡¯s first successful UCIe interoperability test chip demonstration to with controller, PHY, and verification IP, ²ÝÁñÉçÇø has empowered technology visionaries with a comprehensive and scalable multi-die solution from early architecture exploration to manufacturing.

Now, ²ÝÁñÉçÇø is building on its mature and heavily adopted UCIe IP solution to address customer needs for maximum bandwidth and energy efficiency with the 40G UCIe IP.

Differentiated Capabilities

²ÝÁñÉçÇø¡¯ new 40G UCIe IP solution offers features that make it easy to integrate and simplify the customer use cycle, including:

• A single reference clock that supports 100 MHz reference clocking for all UCIe PHYs and eliminates the need for additional high-frequency system PLLs. The internal PLL generates all the high-speed peripheral clock (pclk) and lower local clock (lclk) frequencies needed during initialization and regular operation. The lclk is shared with the controller to further simplify system integration.
• Embedded mission mode signal integrity monitors (SIMs) that are integrated into the IP for diagnosis and analysis from in-design to in-field, ensuring multi-die package reliability and quality. The comprehensive test features embedded in the PHY allow high-coverage testing of the PHY at the wafer level (for Known Good Die) and after package assembly (including die-to-die interconnect).
• Vendor-defined messages that enable the use of existing UCIe sideband channels to send low-speed, low-priority communication between dies without encumbering the main data path. Instead of interrupting the high-bandwidth path with this type of traffic, a die can use the UCIe sideband to send commands such as telemetry and interrupts to the other die.
• Hardware-based bring-up that speeds up initialization without needing to load heavy firmware on the remote chiplet. If UCIe link bring-up would require heavy firmware to be loaded into the die, a separate path would be required to load the firmware. From a design, hardware, and time perspective, this can be wasteful and is best avoided.
• A pre-verified design reference flow that is achieved by integrating the UCIe IP with ²ÝÁñÉçÇø 3DIC Compiler and all the required design collateral and documentation such as automated routing flow, interposer studies, and signal integrity analysis.
• Standard and advanced packaging technology support that gives flexibility to customers, making it easier to integrate and benefit from cost trade-offs. In the past, advanced packaging technology supporting high-density routes and bandwidth meant high expenses. With evolving packaging technology bringing costs down, SoC designers can use complex and advanced packaging at a more affordable level. ²ÝÁñÉçÇø alleviates that trade-off by fundamentally enabling higher bandwidth in the same area and offering a cost-effective solution to support both packaging technologies.
• An automotive UCIe IP that meets the need for ADAS chips, leveraging the multi-die architecture for more advanced functionality. SoC designers can leverage the integrated SIM sensors and test and repair functions to build a more reliable SoC, addressing the demanding automotive requirements.
• AXI, CHI C2C, CXS, PCIe, CXL, and streaming that are available to address the needs of a diverse set of use cases and applications, ranging from streamlined and low-latency connections between compute fabrics in two dies to higher interoperability and leveraging existing software ecosystems with CXL and PCIe protocols.

²ÝÁñÉçÇø is leading the way in developing high-quality UCIe IP and enabling multi-die design success, offering silicon proof points across various foundry nodes for advanced and standard package technologies. As an active member of the UCIe Consortium, ²ÝÁñÉçÇø enables successful ecosystem interoperability by maintaining compliance with the UCIe specifications. Today¡¯s upgrade to 40Gbps further helps customers adapt to the demands of data-intensive applications and achieve efficient high-bandwidth die-to-die connectivity.