Introduction (1)

Overview of Level 1 Trigger

• Two separate systems: Calorimeter and Muon Triggers both feeding CTP and thence TTC.
• Both triggers are multistage systems: data sampled and read out at several points along the level 1 trigger decision path.
• Calibration pulses and digital test vectors can be injected at inputs to many of these stages
• Verification of realtime processing of a single channel of one event requires collection of data from several ROD crates (in both Calo and Muon systems).
• Many different subsystems: crates with RODs only, crates with trigger processor modules only, mixed crates.
• Large number of different module types, each with separate sets of configuration parameters.