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The HERA-B experiment [1, 2] is designed for observation of CP violation in the B-meson system at the HERA machine in DESY. The data acquisition and triggering system must cope with a half million detector channels, a 40 MHz interaction rate and a signal to background ratio of ¥ . A highly selective multi-level trigger and high bandwidth data acquisition system has been designed and is currently being implemented. The second-level event buffer and mid-level trigger switch will be built from DSPdoi:10.1109/23.710937 fatcat:xudc6acskzgt7il65cfgdyzksi