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Caen V1729 Technical Information Manual
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Contents
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PRELIMINARYDocument type: Title: Revision date: Revision:User's Manual (MUT) Mod. V1729 4 Channel 12 Bit Sampling ADC 22/06/2005 3NPO: Filename: Number of pages: Page:00109/04:V1729.MUTx/03 V1729_REV3.DOC 38 82.1.2 Trigger sourcesThere are four possible sources for the trigger signal Ta. They are selectable by the user:Trigger on signal : this is the result of the logic « OR » of the discriminators on theanalog signals of one or several channels of the board by choice of the user. Thecommon threshold of the discriminators is programmable by steps of 0.25 mV over arange of ± 0.5V (which corresponds to the integrality of the usable input range of theboard). The user can also define the type of discrimination (signal higher than or inferiorto the threshold) via the choice of the trigger edge.External trigger : external trigger signal entering on a LEMO plug (EXT_TRIG signal atthe NIM level). This signal can be either used as any other trigger source with choice ofits edge, or exploited directly as an asynchronous trigger (rising edge only) in caseswhere one uses discriminators from several boards in order to produce at the exterior ofthe boards (via their output TRIG_OUT) a trigger which will be sent back to them in asynchronous way (see figure 2.2). This mode is selected by the bit 4 of the TRIG_TYPEregister.Auto trigger : triggered by a software command issued from the acquisition. It permitsthe generation of a random trigger. This corresponds to the automatic trigger mode.- « Auto + normal » trigger : result of a logic « OR » between the trigger on signal andthe automatic trigger.- Internal random trigger : this internal periodic signal, asynchronous of the clock, canbe enabled or disabled. When it is enabled and the trigger mode selected is « auto », thissignal serves as a source for the automatic trigger. One uses it for the fast calibration ofthe verniers of the MATACQ chips.2.1.3 Trigger edgeThe trigger edge (rising or falling) can be selected in all modes (except the direct externaltrigger which uses only the rising edge).2.1.4 TRIGOUT signalA copy of the pre-trigger signal (positive pulse) generated by the V1729 board isavailable at the output on a LEMO plug on the front panel (TRIG_OUT output on the NIMlevel). It can in particular permit synchronization of trigger for several boards.A simplified summary of the trigger modes of the board is presented in fig 2.3. |
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