DFEA2

Summary of Operation

The DFEA2 boards are the workhorse of the Central Track Trigger system. These boards are responsible for finding, sorting, and counting tracks and matching the tracks to CPS axial clusters. Each DFEA2 board has two outputs:

• L1muon. Data is continously sent to the L1muon and L1caltrk subsystems over a dedicated gigabit copper link (SLDB). L1caltrk gets a copy of this link.
• LVDS. The LVDS output normally sends L1 records downstream to the CTOC boards; however when the trigger framework issues a L1accept the DFEA interrupts L1 transmission momentarily to send L2CFT and L2CPS records to the CTOC. The STOV and STSX boards get a copy of this data as well.

Record Types

L1
L1muon
L2CFT
L2CPS

References

The DFEA Technical Design Report is aviailable as DZERO note 4163. NOTE: This is the old stuff but still a good reference.

DFEA2 information.