Real-time data reorganizer for the D0 central fiber tracker trigger system at Fermilab

A custom digital data mixer system has been designed to reorganize, in real time, the data produced by the Fermilab D0 Scintillating Fiber Detector. The data are used for the Level 1 and Level 2 trigger decisions. The mixer system receives the data from the front-end digitization electronics over 320 low voltage differential signaling (LVDS) links running at 371 MHz. The input data are de-serialized down to 53 MHz by the LVDS receivers, clock/frame re-synchronized and multiplexed in field programmable gate arrays (FPGAs). The data are then re-serialized at 371 MHz by LVDS transmitters over 320 LVDS output links and sent to the electronics responsible for Level 1 and Level 2 trigger decisions. The data mixer system processes 311 gigabits per second of data with an input to output delay of 200 ns.