Drift Chamber Trigger Configurations in a nutshell (under construction)

Track Segment Finder Boards (16 TSFX, 8 TSFY Boards)

• The 13 Lookup-Tables (Block Address 0x8 to 0x14) contain 13x65536 addresses with 16 bits each representing possible hit patterns in overlapping pivot groups of 8 wires. The contents for a given address encode the weight (priority) of a given pattern (2 bits), phi-position and phi-error (5 and 4 bits) and the stretch and delay (3 and 2 bits). The stretch and delay values define the number of clock 4 ticks over which the pattern information will be delivered to the BLT and PTD.
• A mask memory (block address 0x5) facilitates the masking off of single pivot-groups for the track segment finding. This feature allows to suppress potential noise on single channels.

Binary Track Linker (BLT)

• A mask memory (block address 0x5) allows to switch on channels that are inefficient. This feature allows to avoid track linking inefficiencies due to potential hardware problems of the Drift Chamber

Transverse Momentum Discriminator (8 PTD Boards)

• 8 Lookup Tables per board define the geometric information (envelopes) that corresponds to a threshold in transverse momentum. The default momentum threshold is 800 MeV.