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For the ATLAS upgrade, we are also working on the read-out driver (ROD) for the L1 calorimeter. These boards are responsible for for collecting data relating to each trigger event as part of a process referred to as Event Building. Data fragments relating to each event are collected from multiple Electron and Jet 'Feature Extractor' boards. These fragments of data are assembled on the ROD into a complete event, before being packetised and then forwarded on for further analysis and storage.

Each ROD is capable of a throughput of more that 200 Gbps, and there will be up to 8 RODs within the system. With their multiple high speed optical and electrical links, which operate at nearly 10 Gbps, these boards push the current limits of hardware design and require highly sophisticated FPGAs to carry out the necessary data processing.