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In order to reconstruct gamma-gamma physics events tagged with High EnergyTagger (HET) in the KLOE-2 (K LOng Experiment 2), we need to measure the TimeOf Flight (TOF) of the electrons and positrons from the KLOE-2 InteractionPoint (IP) to our tagging stations (11 m apart). The required resolution mustbe better than the bunch spacing (2.7 ns). We have developed and implemented ona Xilinx Virtex-5 FPGA a Time to Digital Converter (TDC) with 625 ps resolution(LSB) along with an embedded data acquisition system and the interface to theonline FARM of KLOE-2. We will describe briefly the architecture of the TDC andof the Data AcQuisition (DAQ) system. Some more details will be provided aboutthe zero-suppression algorithm used to reduce the data throughput.

FPGA-based Time to Digital Converter and Data Acquisition system for High Energy Tagger of KLOE-2 experiment