Trigger Output; Start1 And Start2 Triggers - National Instruments DAQ-STC Series Technical Reference Manual

Name
Tstrt
START pulsewidth (edge mode)
START hold from CONVERT_SRC
Th_strt
(level mode)
Ts_stop
STOP setup to CONVERT_SRC
Tstop
STOP pulsewidth (edge mode)
STOP hold from CONVERT_SRC
Th_stop
(level mode)
All timing values are in nanoseconds.
The numbers in parentheses indicate edge-gating mode, depending on which mode you
specify in AI_START1_Edge, AI_START2_Edge, AI_START_Edge, or AI_STOP_Edge.

2.7.8 Trigger Output

You can output the internal triggers to the board through the PFI or RTSI interface. This
section lists the propagation delays for the triggers when you configure the triggers for output
to the board.

2.7.8.1 START1 and START2 Triggers

You can output the START1 trigger on the PFI output PFI0/AI_START1 or on any RTSI
output. You can output the START2 trigger on the PFI output PFI1/AI_START2 or on any
RTSI output. Timing for START1 and START2 depends on whether you select synchronous
mode or asynchronous mode, using AI_START1_Sync and AI_START2_Sync.
Synchronous Mode
When you select synchronous mode for START1 or START2, the timing depends on whether
you select internal CONVERT or external CONVERT, using AI_CONVERT_Source_Select.
In the internal CONVERT mode, the inactive edge of the SI2 source that recognizes the
external trigger generates the output. Figure 2-27 shows the propagation delays for START1.
Figure 2-28 shows the propagation delays for START2.
© National Instruments Corporation
Table 2-5. External Analog Input Timing (Continued)
Description
Chapter 2
Minimum
2-97
Analog Input Timing/Control
Maximum
6 —
4 —
31 (34) —
6 —
4 —
DAQ-STC Technical Reference Manual