National Instruments AT E Series - Manual (Page 78)

Chapter 4 Connecting Signals
© National Instruments Corporation 4-31 AT E Series User Manual
Figure 4-12. TIO 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 device 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
TRIG1
Source
DGND
PFI0/TRIG1
PFI2/CONVERT*
CONVERT*
Source
I/O Connector