Wiener AVM16, User Manual

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Extracted parameters fill the remaining part of the readout FIFOs and in case of valid data, readout
request signals are issued.
A Trigger Feature Extraction algorithm delivers instant integrals and times for trigger purposes. It
is only available in AVX-16 version, prepared for the VXS standard. Extracted parameters are
transferred to a VXS data processor for evaluation of advanced trigger decisions.
The feature extraction and data transfers can ether be triggered internally or by a dedicated pre-
trigger signal delivered from a trigger system via a dedicated front panel connector.
P0 – window beginning
Pi – time for the first non-zero value
Pz – pulse start time calculated from slope crossing the pedestal value
Pa – signal amplitude
Pq – signal integral (charge) *
PPi – minimum value before pileup
PPz – pileup pulse start time calculated from slope crossing the momentary pedestal value Ppi
PPa – pileup pulse amplitude
Pe – pileup integral, starting from PPi
* If pileup occurs, the integral Pq is only calculated untill PPi time
5.3 VME addressing
AVM16/AVX16 reacts to
A32/D32 write and read accesses with Address Modifiers (AM)
0x09/0x0D, to A32/D32 Block Transfer (BLT) with AM 0x0B/0x0F and to A32/D64
Block Transfer (MBLT) with AM 0x08/0x0C. The base address
is set by means of a 6 fold
DIP Switch SW1 according to Table 1
trigger
window
time
time=0
+ -
P0 Pi Pz PPa PPi PPz PPq Pe
Pq
Pa
Pq
Figure 7: Feature extraction parameters