ClusterAlg.gif (577 bytes) The ATLAS Level-1 Calorimeter Trigger

[Home] [Architecture] [Meetings] [Participants] [Publications] [Software] [Search]

Complete Slice Test 1997

Test Overview

This page provides information on the Beam Tests in 1997 of a complete slice through the Level-1 calorimeter trigger. The slice consists of the following components:

FADC Modules:
Digitise calorimeter signals at 40Mhz with 8-bit precision.
TXM (transmit) Modules:
Perform Bunch Crossing Identification and serialise data via G-link or Optobus.
FEM (Front-End) Modules:
Like TXM, with added high-speed data collection and retrieval.
CPM (Cluster processing) modules
Find e.m. clusters, provide energy values for JET and send hit flags to CTP.
JET modules
Identify Jets and send Jet hit signals to CTP.
CTP (Central Trigger Processor)
Accept hit flags and generate the Level-1 Accept signal.
TCM (Timing Control Module)
Controls system clocks and generates event interrupts.

Test Schedule (Postscript or Binhex)

Hardware Documentation

This documentation is available in Level-1 postscript and as Macintosh Binhex files. Some documentation is preliminary.

FADC Programming model (Postscript or Compressed Binhex) and Picture

TXM (1996 version) Programming Model (Postscript or Compressed Binhex) and Picture

FEM Description and Programming Model (Postscript or Compressed Postscript)
Front-end ASIC Manual (Postscript or Compressed Postscript) and FEM Picture

CPM (1996 version) Programming Model (postscript or Compressed Binhex),
User Guide (postscript or Compressed Binhex).
Daughter Card Guide (postscript or Compressed Binhex), and Picture

CPM (1997 version) Draft Programming Model (postscript)

TCM (1996 version) Programming Model (Postscript or Compressed Binhex) and Picture

CTP Programming Model(Postscript) and Picture

JET Programming Model and Picture

Crate Specification (Postscript or Binhex) and Picture

Software Documentation

Diagnostic Software


This documentation is available as HTML files.


This page was last updated on 16 December, 2013
Comments and requests for clarification may be sent to