The CLEO-III trigger: Level 1 decision and gating

M. A. Selen, R. M. Hans, M. J. Haney

Research output: Contribution to journalConference articlepeer-review


The Level 1 decision and data flow control subsystems of the CLEO-III trigger produce and distribute a trigger decision every 42 ns based on input from calorimetry and tracking subsystems. This paper describes the free-running pipelined trigger decision logic that correlates axial and stereo tracking information, and comb62 es time-aligned calorimetry information onto a common backplane. Programmable trigger decision boards monitor this backplane and can be configured as desired to respond to a wide variety of trigger conditions. The resulting trigger decision is regulated by a throttling mechanism that allows the data-acquisition system to modulate the trigger rate to maximize throughput without buffer overrun. A central signal distribution mechanism delivers the trigger decision and system clock to the front-end electronics.

Original languageEnglish (US)
Pages (from-to)562-566
Number of pages5
JournalIEEE Transactions on Nuclear Science
Issue number3 I
StatePublished - Jun 2001
Event2000 Nuclear Science Symphosium (NSS) - Lyon, France
Duration: Oct 15 2000Oct 20 2000


  • Field-programmable gate arrays (FPGAs)
  • Trigger circuits

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering
  • Electrical and Electronic Engineering


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