2003-06-23T09:29:43Z http://cds.cern.ch/record/624704 http://cds.cern.ch/record/624704 2003-06-18T09:43:51Z http://cds.cern.ch/record/622247 http://cds.cern.ch/record/622247 2003-06-17T16:00:21Z http://cds.cern.ch/record/622032 http://cds.cern.ch/record/622032 2003-07-15T17:19:10Z http://cds.cern.ch/record/628661 http://cds.cern.ch/record/628661 2003-06-13T12:16:53Z http://cds.cern.ch/record/621385 http://cds.cern.ch/record/621385 2003-06-12T12:10:35Z http://cds.cern.ch/record/621070 http://cds.cern.ch/record/621070 2003-06-12T01:02:52Z http://cds.cern.ch/record/620643 http://cds.cern.ch/record/620643 2003-06-18T10:49:47Z http://cds.cern.ch/record/623714 http://cds.cern.ch/record/623714 2003-06-16T14:25:36Z http://cds.cern.ch/record/621754 http://cds.cern.ch/record/621754 2003-06-16T14:18:17Z http://cds.cern.ch/record/621753 http://cds.cern.ch/record/621753 2003-06-13T12:09:46Z http://cds.cern.ch/record/621381 http://cds.cern.ch/record/621381 2003-06-12T07:52:29Z http://cds.cern.ch/record/620998 http://cds.cern.ch/record/620998 2003-09-02T20:40:58Z http://cds.cern.ch/record/640307 http://cds.cern.ch/record/640307 2003-06-07T01:01:55Z http://cds.cern.ch/record/620127 http://cds.cern.ch/record/620127 2003-06-12T01:02:50Z http://cds.cern.ch/record/620642 http://cds.cern.ch/record/620642 2003-07-15T17:53:29Z http://cds.cern.ch/record/628662 http://cds.cern.ch/record/628662 eng Garvey, J. Hillier, S. Mahout, G. Moye, T. H. Staley, R. J. Watkins, P.M. Watson, A. Achenbach, R. Hanke, P. Kluge, E-E. Meier, K. Meshkov, P. Nix, O. Penno, K. Schmitt, K. Ay, C. Bauss, B. Dahlhoff, A. Jakobs, K. Mahboubi, K. Schäfer, U. Trefzger, T. Eisenhandler, E. Landon, M. Moyse, E. Thomas, J. Apostoglou, P. Barnett, B. M. Brawn, I.P. Davis, A.O. Edwards, J. Gee, C. N. P. Gillman, A. R. Perera, V. J. O. Qian, W. Bohm, C. Hellman, S. Hidvégi, A. Silverstein, S. The ATLAS Level-1 Calorimeter Trigger Architecture DAQ and Trigger ATL-COM-DAQ-2003-052 The architecture of the ATLAS Level-1 Calorimeter Trigger system (L1Calo) is presented. Common approaches have been adopted for data distribution, result merging, readout, and slow control across the three different subsystems. A significant amount of common hardware is utilized, yielding substantial savings in cost, spares, and development effort. A custom, high-density backplane has been developed with data paths suitable for both the em/tt cluster processor (CP) and jet/energy-summation processor (JEP) subsystems. Common modules also provide interfaces to VME, CANbus and the LHC Timing, Trigger and Control system (TTC). A common data merger module (CMM) uses FPGAs with multiple configurations for summing electron/photon and tau/hadron cluster multiplicities, jet multiplicities, or total and missing transverse energy. The CMM performs both crate- and system-level merging. A common, FPGA-based readout driver (ROD) is used by all of the subsystems to send input, intermediate and output data to the data acquisition system (DAQ), and region-of-interest (RoI) data to the level-2 triggers. Extensive use of FPGAs throughout the system makes the trigger flexible and upgradeable, and several architectural choices have been made to reduce the number of inter-crate links and make the hardware more robust. CERN 2003-05-31 http://cds.cern.ch/record/647874 Detectors and Experimental Techniques http://cds.cern.ch/record/647874 2003-06-11T01:02:12Z http://cds.cern.ch/record/620620 http://cds.cern.ch/record/620620