Programmable Function Input Connections; Figure 4-12. Timing I/O Connections - National Instruments AT-MIO/AI E Series User Manual

Chapter 4 Signal Connections
external TRIG1 source and an external CONVERT* source to two of
the AT E Series board PFI pins.
PFI0/TRIG1
PFI2/CONVERT*
TRIG1 CONVERT*
Source Source
DGND
I/O Connector
AT E Series Board

Figure 4-12. Timing I/O Connections

Programmable Function Input Connections

There are a total of 13 internal timing signals that you can externally
control from the PFI pins. The source for each of these signals is
software selectable from any of the PFIs when you want external
control. This flexible routing scheme reduces the need to change the
physical wiring to the board I/O connector for different applications
requiring alternative wiring.
You can individually enable each of the PFI pins to output a specific
internal timing signal. For example, if you need the CONVERT* signal
as an output on the I/O connector, software can turn on the output driver
for the PFI2/CONVERT* pin. You must be careful not to drive a PFI
signal externally when it is configured as an output.
As an input, you can individually configure each PFI for edge or level
detection and for polarity selection, as well. You can use the polarity
selection for any of the 13 timing signals, but the edge or level detection
will depend upon the particular timing signal being controlled. The
National Instruments Corporation 4-31 AT-MIO/AI E Series User Manual