DVCS3 crate and channel maps

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Crate layout in the DVCS racks

• ROC27: SIS3801 scalers "A" and "B"; CAEN V1190 TDC; ARS modules 0x1,0x2,0x3
• ROC28: SIS3801 scaler "C"; ARS modules 0x4, 0x5, 0x6, 0x7, 0x8
• ROC29: SIS3801 scaler "D"; ARS modules 0x9, 0xA, 0xB, 0xC, 0xD
• DVCS trigger crate
• NIM crate
• ROC30: SIS3801 scaler "E"; DVCS trigger readout card

Channel layout for SIS3801 scalers "A" and "B" and CAEN V1190 TDC

The input signals for SIS3801 scalers "A" and "B" and CAEN V1190 TDC are daisy chained from "A", to "B", then terminate at the TDC. Scalers "A" and "B" have had their internal termination resistors removed. Both scalers are gated by the spectrometer scaler gate, but scaler "B" is further disabled by the DVCS trigger busy (which includes the TS busy). Both scalers and the TDC are latched by a narrow pulse formed from the ARS_valid signal.

1. 512ns clock from DVCS trigger crate (1)
2. DVCS cosmic trigger
3. s0
4. s2
5. CER
6. EDTM
7. DVCS external clock or LED trigger
8. ARS_stop
9. ARS_valid
10. DVCS calorimeter ADC_gate
11. inverted S0
12. inverted S2
13. inverted CER
14. L1A
15. CaloBlock001
16. External S2M_CER
17. 64ns clock from DVCS trigger crate
18. 512ns clock from DVCS trigger crate (2)
25. Master_OR
26. Master_OR_Live
27. HRS_Single
28. S2M_CER
29. S2M_CER_Scaled
31. 103kHz clock from spectrometer
32. BCM signal