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TDC-F1 Trigger Matching | ||||
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TDC-F1 was developed for and together with the University of Freiburg to be used
in the COMPASS experiment at CERN, Switzerland. A key feature of the TDC-F1 is it's complex trigger matching unit. In the COMPASS experiment only a small portion of the events and the corresponding hits on the TDC are of interest. Due to the large number of detectors and therefore a very high data rate, it is necessary to preprocess the data and select only relevant data for transfer. A separate electronic unit (Trigger Control System TCS) decides, whether an event is relevant or not. This valuation needs it's time. So when the TCS sends a trigger signal, this trigger is related to data in the past. The time between a relevant event and the trigger signal is called trigger latency and is fix for an experimental setup. In addition the trigger window defines the time slot after this event, in which relevant hits may occur. The TDC-F1 has the built-in FIFO's and data processing units to do the complex data filtering. He shift only data to the output which are inside the trigger window. In trigger matching mode the TDC-F1 can reach up to 20 MHz data rate. | ||||
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