Abstract
The L3 first-level energy trigger is based on energy measurements in electromagnetic and hadronic calorimeters and in luminosity monitors. The information from these detectors is evaluated and a decision is taken in about 20 μs (the time between two bunch crossings in LEP is 22 μs). This trigger makes use of 300 CAMAC modules: an arithmetic logic unit (ALU), a BUS multiplexer (BS), a memory lookup table (MLU), a data stack (DS) and a fast encoding and readout ADC (FERA), each of them performing dedicated functions. The data are transmitted via front-panel ECL buses. The CAMAC data-way is used only for initialization and checking purposes. The system operates synchronously with a period of 60 ns.
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