Input Mezzanine Board for the Fast Tracker (FTK) at ATLAS

At LHC Run 2, which started operation in June 2015 at a center-of-mass energy of 13 TeV, the peak luminosity has exceeded 210^{34} cm^{-2}s^{-1} and the LHC produce an average of 60 simultaneous collisions. The higher luminosity demands a more sophisticated trigger system with increased use of tracking information. The Fast Tracker is an integral part of trigger upgrade program for the ATLAS experiment. The Fast Tracker is a massively parallel hardware system using associative memories and FPGAs. It operates at the full Level-1 accepted rate of up to 100 kHz and provides full event track reconstruction for all tracks with pT > 1GeV with an average latency below 100 μs. The Input Mezzanine Board is the input interface of the entire system which performs full reconstruction of all clusters. This note reports details of its functionality and the status of the installation and commissioning.