General Description
Most of the trigger logic takes place in the fastbus crate TRIG, which is readout and loaded by the SSP 801 in cable segment #1. A description of how the SFI, with a PowerPC, loads the trigger is provided here . A description of the readout of the TRIG crate is also available .
The trigger has 3 types of triggers 1) "A" triggers have BS=KB and DS=T*2
2) "B" triggers make their own strobes and 3) "D" triggers which have DS=T*2 and BS=pibeam. THe first 8 A-type triggers can have L1.n applied.
Some specifics on various trigger boards
- Level 0
- ANDOR board, Sequencer, RZ board, Trigger Transmitter (TT), Rance Cards (RC), Meantimer (MT2A) , kludge Boards , IO boards , BD board , Prescalers, Delay-Width-Fanouts (dwf)
- Board ID's
- BD Board Trigger Assignments
- Prescaler Board Assignments
- Stopping Counter Finder (SCF)
- External Conditions for Trigger Transmitter(TT)
- Log of changes to External Conditions
- Log of changes to on board prescale factor
- L0 Refined Range (L0rr)
- Level 0 z measurement (L0z)
- Number of target elements (Ntgt)
- L0rr masks
- Level 0 Photon Veto using Meantimers
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- Level 1.1
- Level 1.2
- MT2A Upgrade Project