The Upgrade of the ATLAS Level-1 Central Trigger Processor ANDERS G Ruprecht-Karls-Universitaet Heidelberg (DE) BERGE D CERN BERTELSEN H University of Copenhagen (DK) DAM M University of Copenhagen (DK) DOBSON E CERN ELLIS N CERN FARTHOUAT P CERN GABALDON RUIZ C CERN GHIBAUDI M CERN GORINI B CERN HAAS S CERN KANEDA Mi CERN MESSINA A CERN PAULY T CERN POTTGEN R CERN SPIWOKS R CERN WENGLER T CERN MAETTIG S Hamburg University (DE) STOCKTON M McGill University (CA) XELLA S Niels Bohr Inst. Astr., Phys, & Geo-University of Copenhagen 2012 The ATLAS Level-1 Central Trigger Processor (CTP) combines information from calorimeter and muon trigger processors as well as other sources and makes the final Level-1 Accept (L1A) decision. Due to the increasing luminosity of the LHC and the growing demands of physics and monitoring placed on the ATLAS Level-1 trigger system, the current CTP has reached its design limits. Therefore and in order to provide some margin for future operation, the CTP will be upgraded during the LHC shutdown of 2013/14. PUBLATLASSLIDE