FELIX: the new ATLAS readout system for the High-Luminosity LHC

The Front-End Link eXchange (FELIX) system is a new ATLAS DAQ component designed to for detector readout in the High-Luminosity LHC era. FELIX acts as the interface between the detector, the data acquisition and the trigger timing systems, routing data between custom serial links on board the front-end electronics and data collection and processing components via a commodity switched network. This presentation covers the current design of FELIX and its evolution for High-Luminosity LHC, including the development of a new hardware platform based on the Xilinx Versal family of FPGAs, incorporating PCIe Gen4 and a new 25Gbps optical link standard.