Enabling Runtime Flexibility in High-Speed Designs with F-Tile Dynamic Reconfiguration - Enabling Runtime Flexibility in High-Speed Designs with F-Tile Dynamic Reconfiguration Before getting into architecture, it helps to make dynamic reconfiguration tangible. A networking platform may need to start as a single 400G link , then later operate as 4×100G links using the same underlying hardware. A fronthaul system may need to switch between Ethernet and CPRI transport modes without redesigning the board. And in modern Ethernet systems, designs may need to respond dynamically to negotiated link conditions and adjust their configuration in real time. These are not theoretical scenarios; they are exactly the kinds of transitions enabled by F-Tile Dynamic Reconfiguration in Agilex® 7 devices. In the accompanying demo video, you’ll see a real system doing exactly this: Two Agilex 7 FPGA boards connected over QSFP-DD Live Ethernet traffic running at 400G A runtime switch to 4×100G configuration Then switching back to 400G, all without restarting the system A System-Level Approach to Reconfiguration Dynamic reconfiguration in F-Tile is designed as a coordinated system operation, not just a low-level adjustment. Instead of modifying isolated parameters, DR can reconfigure the full high-speed data path, including: MAC PCS FEC PMA Interconnect routing across EMIB This allows complete interface transformations such as changing Ethernet data rates or switching protocol modes, while the rest of the system remains operational. In the demo, this system-level behavior is visible when the design transitions between 400G and 100G modes by updating lane mappings and data path configuration in real time. Deterministic Switching with Predefined Profiles All supported configurations are defined as profiles at compile time. Each profile represents a fully validated system state, and transitions between profiles are: Predefined Controlled Executed through optimized programming sequences This ensures that runtime changes are: Predictable Repeatable Safe for production environments In the demo flow, these profiles correspond to the 400G configuration and the 100G configuration , with the system switching cleanly between them using scripted control. Software-Driven Control with Integrated Hardware Awareness Reconfiguration is managed through a Nios® V-based control plane, which orchestrates the transition between profiles. This includes: Initiating reconfiguration events Programming tile-level registers Managing reset sequencing Monitoring status and completion signals In the demo, this control is implemented through a TCL-based workflow using System Console, which: Issues reconfiguration commands Logs each transition step Reports status and any error conditions in real time Built for High-Speed Ethernet and Multi-Protocol Designs F-Tile DR is specifically optimized for high-speed networking use cases. It supports: Multi-rate Ethernet configurations (e.g., 25G, 100G, 400G) Advanced PHY modes and FEC options Integration with Auto-Negotiation and Link Training (AN/LT) In the demo, the design uses: IEEE 802.3-compliant Ethernet IP Real traffic generation and checking Continuous validation of CRC, throughput, and FEC This ensures that the system is not just switching modes but doing so while maintaining standards-compliant operation. Fine-Grained Control Through Reconfiguration Groups Dynamic reconfiguration operates on defined groups of IP within a tile. This enables: Selective reconfiguration of specific interfaces Independent control of different subsystems Support for both exclusive and concurrent configuration models Designers can therefore introduce flexibility exactly where it is needed, without impacting the entire device. Designed for Real Systems, Not Just Flexibility F-Tile DR is built with practical deployment in mind. It enforces key architectural constraints to ensure signal integrity and system stability, including: Consistent clocking across profiles Fixed topology within reconfiguration groups Controlled transitions through reset states These constraints are fundamental to maintaining reliable operation in high-speed systems. In the demo, this robustness is reflected in: Successful link bring-up after each transition Stable traffic flow No packet loss observed during switching Why This Matters Dynamic reconfiguration transforms FPGA-based systems from static implementations into adaptable platforms. With F-Tile DR, designers can: Support multiple configurations on a single hardware platform Adapt to changing system requirements in real time Reduce development cycles by avoiding full recompilation Enable more efficient use of high-speed resources As data rates increase and system requirements evolve, this level of flexibility becomes a critical enabler for modern designs. Watch the accompanying demo video to see these concepts in action, including real-time switching between 400G and 100G Ethernet modes, live traffic validation, and system-level reconfiguration.