A 40 MHz-pipelined trigger for

The "neutral" trigger system for the selection of K#P2##P4# decays of the NA48 CP-violation experiment isdescribed. The trigger system has been implemented in a 40 MHz "dead-time free" pipeline to allow large rate reductionand high-trigger e#ciency. The trigger decision is based on the information from 13 340 cells of the electro-magneticcalorimeter. Every 25 ns the energy, the centre of gravity, the kaon lifetime and the number of peaks in calorimeterprojections are calculated in the...