February 25, 2009 online meeting minutes
present: Sergey Boyarinov, Sergey Pozdnyakov, Nerses Gevorgyan, Ben Raydo, Chris Cuevas
1. JLAB discriminator
+ range 0-1V, accuracy is +-3mV, step 0.25mV; there is temperature dependence - to be documented
- + preamplifiers will stay but gain reduced to 2 from 4; gain can be changed by changing resistors (soldered)
- + positive pulse will not harm
- + mask outputs: can disable all, enable all, disable trigger outputs only (cannot disable tdc output only), all individual channels
- + add test input: directly to digital side
- + individual channel thresholds, min 10 mV - real: will try to satisfy (histeresis is set t0 5mV, so 10mVthreshold is on the edge)
- + add second output connector: yes, 2 34-pin
- + different thresholds for output 1 and output 2 (optional on the board)
- + individual programmable width for trigger, step 4ns, min 4ns; for tdc output is common, 10ns min, at least 4ns step; max=100ns; non-updating mode
- + channel-based output delays for trigger output connector - about 20ns constant part, plus 4ns step (remember jitter 4ns !), 512ns max
- + 16-channel board !!!
- + fast enough: 100MHz (double pulse res 11ns)
- + internal delay (trigger is 20ns, tdc is less then 10ns)
- + thermodrift - to be studied on prototype
- + remove monitor
- + not-stop scaler readout
- + 2 set of 32-bit scalers, one of then has external gate
- + OR for trigger output, same time as signal on trigger output connector (NIM)
- + user code in FPGA (left-right compensation, etc) - will not implement anything but will be a space in main FPGA chip
- + VME readout: write/read all registers, A32/D64 with DMA
- + VME firmware upgrade
2. eg1dvcs run status
- BASEB must be modified (symb likns, top make file etc), maybe redirect epics's make application to our BASEB - Nerses
- ECHV1 boards sometimes trips, we believe that it is related to bad connectors; trying to push pins in
- Sergey B. is working to implement recovery procedure to have in DB runs with failed end