Dynamic Generation Triggers and Events

The following table describes the relationship of triggers and events in a dynamic acquisition operation. The sequence of triggers and events is shown in the Dynamic Generation State Diagram.

Start, Pause, and Script triggers are received asynchronously by the Pattern Generation Engine. Cable propagation delays and pipeline delays can cause the Pattern Generation Engine to take multiple clock cycles to respond to a trigger. Refer to NI 654x specifications for more information. The Ready For Start, Data Active, and Marker 0 events are generated by the Pattern Generation Engine synchronous to the data generation.

The following table provides information about how these triggers and events can arrive at and be exported from the NI 654x.

Trigger/Event	Received From	Exported To
Start Trigger	The Start trigger can be received from a rising or falling edge on PFI <0..3>, RTSI<0..7> (PCI devices), or PXI_TRIG<0..7> (PXI devices). The Start trigger can also be sent by software.	The Start trigger can be exported to PFI <0..3>, RTSI<0..6> (PCI devices), or PXI_TRIG<0..6> (PXI devices).
Pause Trigger	The Pause trigger is level-based and can be received on PFI<0..3>, RTSI<0..7> (PCI devices), or PXI_TRIG<0..7> (PXI devices). The Pause trigger can also be sent by software. Note  When the Pause trigger is asserted, the NI 654x Pattern Generation Engine may take several clock cycles to respond because of cable propagation delay and the pipelining in the system. Refer to the NI 654x specifications for more information.	The Pause trigger can be exported to PFI <0..3>, RTSI<0..6> (PCI devices), or PXI_TRIG<0..6> (PXI devices).
Script Trigger <0..3>	Four Script triggers can be edge- or level-based and can be received on PFI <0..3>, RTSI<0..7> (PCI devices), or PXI_TRIG<0..7> (PXI devices). The Script trigger can also be sent by software.	The Script trigger can be exported to PFI <0..3>, RTSI<0..6> (PCI devices), or PXI_TRIG<0..6> (PXI devices).
Ready for Start Event	—	The Ready For Start event can be exported to PFI<0..3>, RTSI<0..6> (PCI devices), or PXI_TRIG<0..6> (PXI devices).
Data Active Event	—	The Data Active event can be exported to PFI <0..3>.
Marker Event <0..3>	—	A Marker event can be exported to PFI <0..3>, RTSI<0..6> (PCI devices), or PXI_TRIG<0..6> (PXI devices).