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Trigger

Figure 2.23: Gating block logic for the AND connection of two triggers.

2.4.5 Auto Triggering Function Generator

Some applications require periodic or random triggering. Ndigo5G’s function generator provides

this functionality.

The delay between two trigger pulses of this trigger generator is the sum of two components:

A ﬁxed value M and a pseudo random value given by the exponent N.

The period is

T = 1 + M + [1...2

] (2.1)

clock cycles with a duration of 3.2 ns per cycle.

This allows to monitor input signals at times the current trigger conﬁguration does not trigger,

e. g. to get base line information in mass spectrometry applications. It can also be used to

determine a suitable threshold level for the trigger by ﬁrst getting random statistics on the input

signal.

2.4.6 Timestamp Channel

The timestamp channel produces a stream of small packets that denote the time of the trigger

event. An arbitrary set of trigger sources can be selected in the trigger matrix to cause the

creation of a packet.

The packets have a ﬁxed length of 16 bytes. The format is described on page 41. The length

ﬁeld of the packet contains a 32 bit pattern that contains the levels of all trigger sources at the

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