Trigger and Readout Electronics

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Trigger Scintillators

HV: 1200 on both scintillators

Thresholds: 20 mV


FADC 250

  • Flash 1: Slot 14 (B21595_30R, Address 0x700000 )
  • Flash 2: Slot 15 (B21595_14R, Address 0x780000)

Range: 2 V


  • FADC1 - downstream end
Ch 0 - 3 BCAL layer 1
Ch 4 - 7 BCAL layer 2
Ch 8 - 11 BCAL layer 3
Ch 12 - 15 BCAL layer 4


  • FADC2 - upstream end


JLab LE discriminators

Serial DSC1 (downstream):

Serial DSC2 (upstream):


F1TDC

Downstream End

TDC Channel 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
BCAL TDC Output 0 1 2 3 not used not used not used not used 4 5 6 7 8 9 10 11


TDC Ch 0 - 3 BCAL layer 1
TDC Ch 8 - 11 BCAL layer 2
TDC Ch 12 - 15 BCAL layer 3

Upstream End

TDC Channel 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
BCAL TDC Output 0 1 2 3 4 5 6 7 8 9 10 11 not used remote scint (fixed 4/19/12) Triggger Scint (used for trigger) Trigger Scint


TDC Ch 16 - 19 BCAL layer 1
TDC Ch 20 - 23 BCAL layer 2
TDC Ch 24 - 27 BCAL layer 3