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Broadcom PCIe & CXL Switches OCP Final.pptx
- 1. Broadcom Accelerates PCIe/CXL Roadmap to Enable the Open AI Ecosystem
- 2. Broadcom Accelerates PCIe/CXL Roadmap to Enable the Open AI Ecosystem Rick Kutcipal, Product Planner, Broadcom Sreeni Bagalkote, Product Planner, Broadcom AI
- 3. Broadcom PCIe & CXL Switches Predictable high-quality execution for 10+ Years Increasing lane counts for AI systems Simple fanout Internal fabric 86x bandwidth increase Low power / lane
- 4. Atlas 3: PCIe Gen 6 & CXL 3.1 Switch 144 lane switch in 5nm technology Peer-to-Peer across virtual hierarchies CXL.mem, CXL.cache, & CXL fabric support Best in class SerDes (> 36db margin) Embedded PCIe analyzer Dec 2024 Samples
- 5. PCIe Gen 5 Gen 6 Complexity Features Gen 1 Gen 2 Gen 3 Gen 4 Gen 5 Gen 6 Complexity Physical Bus Freq. (GHz) 2.5 5 8 16 32 32 High Complexity Throughput (MB/s) 4 8 16 32 64 128 Physical Encoding NRZ NRZ + PAM4 Link Link Data Integrity ECRC ECRC + FEC High Complexity Wire Protocol Variable length packets Variable + Fixed length (Flit) Replay Protocol Packet ACK/NAK Packet ACK/NAK + Flit-based ACK Transaction Packet Formats 4 Header Types, 22 Packet types 7 Header Types, 61 Packet types High Complexity Credit Protocol 3 credit types 3 credit + Flit credits, 2 shared credits Encryption Support - Link and Stream(end-to-end) PCIe Gen 5 Gen 6 transition is highly complex
- 6. • PCI Gen 6 / CXL 3.1 • Opening to all ecosystem partners for interop • Available Now • Contact for details rick.kutcipal@broadcom.com sreenivas.bagalkote@broadcom.c om Atlas 3 FPGA Platform Available for Interop 1 2 3 4 5 6 7 8 9 1 Atlas 3 FPGA platform 2 PCIe subsystem 3 CXL subsystem 4 ARM 15 5 Sprite daughter card 6 Debug daughter card 7 Drive connection daughter card 8 Host connection daughter card 9 Atlas 3 FPGA setup
- 7. Atlas 3 Rapid Development Kit (RDK) • Multi-host PCIe & CXL topologies • Create fabric using multiple RDKs • CXL memory modules via riser card • Allows out-of-band BMC connection • Validated with Broadcom Gen 6 retimer Available Dec 2024
- 8. Atlas Enables Open AI Architectures CPU CPU CPU CPU GPU GPU GPU GPU GPU GPU GPU GPU CXL Memory Ethernet NIC Storage CXL Memory Ethernet NIC Storage Open internal AI fabric Open scale-up fabric
- 9. Announcing Atlas 4 – PCIe Gen 7 & CXL Switch 128 Gb/s Broadcom PAM4 SerDes 3nm Process Technology Sample Availability Dec 2025 Atlas4 AI
- 10. Thank you!