Chapter 3 Hardware Overview
National Instruments Corporation
3-13
DAQCard E Series User Manual
Timing Signal Routing
The DAQ-STC provides a very flexible interface for connecting timing
signals to other boards or external circuitry. Your DAQCard uses the
Programmable Function Input (PFI) pins on the I/O connector to
connect to external circuitry. These connections are designed to enable
the DAQCard to both control and be controlled by other boards and
circuits.
The DAQ-STC has a total of 13 internal timing signals that can be
controlled by an external source. These timing signals can also be
controlled by signals generated internally to the DAQ-STC, and these
selections are fully software configurable. For example, the signal
routing multiplexer for controlling the CONVERT* signal is shown in
Figure 3-10.
This figure shows that CONVERT* can be generated from a number of
sources, including the external signals PFI<0..9> and the internal
signals Sample Interval Counter TC and GPCTR0_OUT.
Figure 3-10. CONVERT* Signal Routing
PFI<0..9>
CONVERT*
Sample Interval Counter TC
GPCTR0_OUT
