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Overview

SmartDV’s Ethernet 2.5G PCS IP is a silicon-proven, fully featured Physical Coding Sublayer solution purpose-built for SoC designs requiring 2.5 Gigabit Ethernet backplane and short-reach copper connectivity across networking switch, router, and embedded system applications. Compliant with IEEE 802.3cb (2.5GBASE-KX backplane Ethernet), it delivers complete 2.5G PCS functionality with TBI Interface support, GPII (Gbps PCS Internal Interface), and 8b/10b encoding, providing a speed upgrade path for the massive installed base of 1 Gbps Ethernet backplane deployments.

Designed for the practical integration requirements of modern 2.5G backplane SoC designs, the IP implements 8b/10b encoding to generate code groups in the transmit path and 10b/8b decoding to convert received code groups to 32 XGMII data bits and 4 XGMII control bits, complete code group boundary synchronization, and IEEE 802.3 Clause 37 Auto-Negotiation alongside Clause 73 backplane Auto-Negotiation for reliable link establishment. Its loopback functionality, link fault and error indication signaling, and IEEE 802.3az Energy Efficient Ethernet support give networking SoC teams a production-tested, spec-complete 2.5G PCS implementation for backplane and embedded switch designs.

Built for design flexibility and silicon efficiency, the IP core is highly configurable for both ASIC and FPGA implementations, with a strong focus on area optimization, power management, and peak performance. Its parameterized PCS architecture and clean host interface enable fast integration across a wide range of networking process nodes.

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Ethernet 2.5G PCS
Key Features
  • Full 2.5G Backplane PCS Functionality – Complete PCS implementation compliant with IEEE 802.3cb (2.5GBASE-KX) supporting 2.5 Gbps operation with TBI Interface
  • GPII Interface Support – Gbps PCS Internal Interface support for flexible backplane and internal SoC connectivity
  • Bidirectional 8b/10b Coding – 8b/10b encoding to generate code groups in transmit path and 10b/8b decoding to convert received code groups to 32 XGMII data bits and 4 XGMII control bits
  • Code Group Synchronization – Complete code group boundary synchronization for reliable frame alignment
  • Dual Auto-Negotiation Support – IEEE 802.3 Clause 37 Auto-Negotiation and Clause 73 backplane Auto-Negotiation for flexible link partner capability detection
  • Energy Efficient Ethernet Support – IEEE 802.3az EEE support for power-efficient operation during periods of low link utilization
  • Loopback Functionality – Configurable loopback modes for design validation and system-level diagnostics
  • Link Fault and Error Indications – Complete link fault detection and error indication signaling for robust network diagnostics
  • 1G Backplane Upgrade Path – Provides a speed upgrade path for existing 1 Gbps Ethernet backplane and embedded switch deployments
  • Flexible Interface Compatibility – Compatible with GMII, TBI, and internal SoC PCS interconnect configurations
Compliance and Compatibility
  • Compliant with IEEE 802.3cb specification for 2.5GBASE-KX backplane Ethernet
  • Compliant with IEEE 802.3 Clause 37 Auto-Negotiation and Clause 73 backplane Auto-Negotiation
  • Compliant with IEEE 802.3az Energy Efficient Ethernet
  • Configurable SoC interface supporting AMBA AXI, AHB, APB, and custom wrappers for seamless integration
  • Compatible with ASIC and FPGA design flows across leading foundry process nodes
  • Compatible with all major EDA synthesis, simulation, and linting flows

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