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2.4.4 Gating Blocks

Trigger

Figure 2.20: Gating Blocks: Each gating block can use an arbitrary combination of inputs to

trigger its state machine. The outputs can be individually inverted and routed to

the AND-gate feeding the trigger blocks.

To decrease the amount of data transmitted to the PC, Ndigo5G includes 4 independent gate

and delay units. A gate and delay unit creates a gate window starting at a speciﬁed time after

a trigger, closing the window at gate stop. Both timing values gate start and gate stop must

be set as multiples of 3.2ns.

Trigger blocks can use the gate signal to suppress data acquisition: Only data that fulﬁlls

zero suppression speciﬁcations occurring in an active gate window is written to the PC.

As input, any trigger from the 4 trigger blocks, the GATE and Trigger inputs, a trigger from

a connected board and the function generator can be used.

The retrigger feature will create a new gate if a trigger occurs during an active gate window.

The gate signal can be inverted, causing an active gate to close for a time deﬁned by the user.

The parameters of a gating block are set in Structure ndigo gating block described on page

36.

Figure 2.21 shows the functionality of the gate timing and delay unit. Active gate time is

marked in green.

cronologic GmbH & Co. KG 15 Ndigo5G User Guide

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Cronologic Ndigo Crate Guía de usuario Pagina 20