Download FLT V4 User Manual

1. Introduction
.
2. Trigger Concept
The trigger concept is developed for fast data reduction and consists of three levels first (FLT) & second level hardware triggers (SLT) and third level trigger (TLT)
implemented in software. The total front-end electronics of a telescope housed in a
commercial 19’’ subrack that consists of 21 modules - 20 first level trigger (FLT)
modules and 1 second level trigger (SLT) module - connected via monolithically
backplane.
The 440 PMT signals from the camera are processed by 20 FLT boards (one board
per column) with 22 input channels per board. The FLT module is partitioned by
analog and digital submodules. In the following the digital part of first level trigger
electronics will be described.
SLT
ETH
up to 20 FLTs
gain
Cntrl
24 channels
Param.
Thresh.
emb.
PC
TimeMgr
ADC
Filter
Trigger
Timer
RAM
FLT
Figure. Trigger Concept
Control
Unit
SysCntrl
RAM