Research on the trigger system of readout electronics in HIRFL-CSR

The paper is to introduce the research on the trigger system of CSR readout electronics which are based on the PXI bus. The trigger system consists of different trigger levels according to the trigger signals characters in the high energy physics experiments. The final trigger, what is the envent trigger, comes from the former trigger level signals, which stand for different physics actions. The trigger system then will fan out the final trigger to subsystems to choose the opposite data. Being testted with the whole detector system, the mini trigger system works well with good preformance in functions. It will be a good example for the future whole electronic system. (authors)