Configuration Register

  Trigger Overlap:
     When two acquisition windows are overlapped the second trigger can be either accepted or rejected

  Individual trigger:
     This bit must be set to 1

  Invert Input:
     The DPP algorithms are designed to work with positive pulses. The input signal polarity can be digitally inverted inside the FPGA before applying the algoriths. 
        Not Inverted   -  analog signals are positive
        Inverted       -  analog signals are negative

  Dual Trace:
     When the oscilloscope mode is enabled it is possible to read two different waveforms from the FPGA. In this mode the samples of the two signals are interleaved - thus each waveform will be sampled at 50 Msps. When Dual Trace is disabled the signal selected by Virtual Probe 1 is sampled at 100 Msps.

  Virtual Probe 1:
     Selects which signal is associated with trace 1 when oscilloscope mode is enabled.

  Virtual Probe 2:
     Selects which signal is associated with trace 2 when both oscilloscope mode and dual trace mode are enabled.

  Oscilloscope Mode:
     When enabled the digitizer acts as an oscilloscope. The readout data contains the sequence of the samples that belong to the signals selected by the Virtual Probe options.

  Energy Mode: 
     When enabled the peak amplitude of all the pulses, calculated by means of the trapezoid filter, is saved into the event data as soon as it is available. 

  Time Tag Mode:
     When enabled the time tag (the zero crossing of the delta2 signal) of all the pulses is saved into the event data as soon as it is available. 

  Digitial Virtual Probe:
    There are several digitial control signals in the algorithm implemented inside the FPGA. It is possible to save one of them in the event data.

  Enable Event Data Format Word:
    See event format. This option must be enabled (set to 1)


     
Board Configuration (0x8000, 0x8004 (BitSet), 0x8008 (BitClear), R/W, C)
This register contains general settings for the board configuration.
Bit Description
[0] Reserved: must be 0.
[1] Reserved: must be 0
[2] Trigger Propagation: enables the propagation of the individual
   trigger from mother board individual trigger logic to the mezzanine.
  This is required in case of coincidence trigger mode
[3] Reserved: must be 0
[4] Reserved: must be 1.
[7:5] Reserved: must be 0
[8] Individual trigger: must be 1
[9] Reserved: must be 0
[10] Reserved: must be 0
[11] Dual Trace: in oscilloscope or mixed mode, it is possible to plot
    two different waveforms. When the dual trace is enabled, the samples
   of the two signals are interleaved, thus each waveform is recorded
  at half of the ADC frequency. The two analog probes can be selected
 from bits[13:12] and bits[15:14] respectively.
[13:12] Analog Probe 1: Selects which signal is associated to the Analog
       trace 1 in the readout data. Options are:
      00:Input;
     01:RC-CR (input 1st derivate);
    10:RC-CR2 (input 2nd derivate);
   11:Trapezoid (output of the trapezoid filter).
[15:14] Analog Probe 2: Selects which signal is associated to the Analog
       trace 2 in the readout data. Options are:
      00:Input;
     01:Threshold, which is referred to the RC-CR2 signal;
    10:Trapezoid – Baseline;
     11:Baseline (of the trapezoid).
[16] Waveform Recording: enables the data recording of the waveform. The
    user must define the number of samples to be saved in the Record
   Length 0x1n20 register. According to the Analog Probe option one or
  two waveforms are saved. Options are:
 0: disabled;
1: enabled.
[17] Energy Mode: When enabled, the height of the trapezoid (which
    corresponds to the peak amplitude of the pulses) is saved into the
   event data (last word of the event). Options are:
  0:Energy Mode disabled.
 1:Energy Mode enabled.
[18] Time Stamp Recording: When enabled, the time stamp of the event
    (which corresponds to the zero crossing in the RC-CR2 timing filter)
   is saved into the event data (first word of the event).
  0:Time Stamp recording disabled.
 1:Time Stamp recording enabled.
[19] Reserved: must be 0

[23:20] Digital Virtual Probe 1: when the mixed (or oscilloscope) mode is
       enabled, the following digital virtual probes can be selected. Check
      the User Manual for further details.
     0000: shows the RT Discrimination Width;
    0001: "Armed", digital input showing where the RC-CR2 crosses the
   Threshold;
  0010: "Peak Run", starts with the trigger and last for the whole
 event;
0011: "Peak Abort", corresponds to the time interval when the energy
calculation is disabled due to the pile-up event;
0100: "Peaking", shows where the energy is calculated;
0101: "Trg Validation Win", digital input showing the trigger
validation acceptance window TVAW;
0110: "BSL Holdoff", shows the baseline hold-off parameter;
0111: "TRG Holdoff", shows the trigger hold-off parameter;
1000: "Trg Validation", shows the trigger validation signal TRG_VAL ;
1001: "Acq Veto", this is 1 when either the input signal is
saturated or the memory board is full.
[24] Enable FORMAT Word in the aggregate data. Must be 1.
[31:25] Reserved