Wiener AVM16, Руководство пользователя

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4 Triggering
AVM16 / AVX16 can either be trigger internally or externally. The external trigger time is
distributed via a broadcast command. Trigger time is used to set time boundaries for scanning the
Dual-Ported RAM’s, given user defined trigger latency and trigger window, see figure 3.
The trigger source configuration is in register 0x100.
4.1 Internal trigger functionality
When the signal in one of the non inhibited channels overcomes the trigger level set in the register
0x110 with reference to the actual baseline, all non inhibited channels are read out. The trigger
condition is
ADC_VALUE > BAS TRIGGER_LEVEL
and is checked at 80 MHz rate, each time for two samples sequentially. The trigger uncertainty is
thus +/- 1 sample, corresponding to a range of 12.5 ns.
4.2 External trigger functionality
All non inhibited channels are read out when a LVDS singal is feed into the TRG port on the front
panel.
4.3 Software trigger
All non inhibited channels are read out upon write on bit 2 of register 0x104
Figure 3: Data window for feature extraction