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The Belle II experiment relies on an online level 1 trigger system to reduce the background and achieve the targeted frequency of 30 kHz. Here the basis for all trigger decisions based on data from the Central Drift Camber is the track segment finding. To improve both efficiency and maintainability we restructured the original combinatorial approach to finite state machines. The new implementation is saving about 20% of FPGA slices. To achieve high test coverage an automated test framework was developed for design time validation. Operational correctness is achieved by integration in cosmic ray tests.

Realization of a state machine based detection for Track Segments in the Trigger System of the Belle II Experiment