1. Trigger Input Signals

Each TEM produces four trigger input signals:

• Tracker 3-in-a-row (TKR)

• Calorimeter Low Energy (CAL_LE)

• Calorimeter High Energy (CAL_HE)

• Busy Signal

Each FREE produces 19 trigger input signals:

• CNO Signal

• 18 Veto Signals ( VETO₀ … VETO₁₇ )

This is a total of 54 signals.

Each signal can be specified as asserted (on) or de-asserted (off) for varying amounts of time in units of sysclks (50 ns for a 20 MHz clock).