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Hall D DAQ Architecture Overview

The data acquisition goal for the Hall D detector is to accept on the order of a 160 $\,$ kHz Level 1 trigger rate while not incurring any DAQ system deadtime. These data will be passed through a Level 3 farm and reduced to a 14 KHz rate to permanent storage. These requirements put restrictions the the design of the DAQ system at every level from front-end to tape.

**Figure 1:** Global Level 1 Trigger
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Global Trigger
Front End Processing and Data Flow
CODA Back End

David Abbott
1/5/2000