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2.4.3 Gating Blocks

Figure 2.15: 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, the Ndigo250M-14 includes 4 indepen-

dent 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.

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

zero sup-pression speciﬁcations occurring in an active gate window is written to the PC.

All triggers from the 4 trigger blocks, the GATE and TRIGGER inputs, triggers from a

connected board and the function generator can be used as inputs.

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.

cronologic GmbH & Co. KG 14 Ndigo250M-14 User Guide

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