National Instruments NI 6014 - Manual (Page 25)

Chapter 3 Hardware Overview
© National Instruments Corporation 3-5 NI 6013/6014 User Manual
control signals, GPCTR0_UP_DOWN and GPCTR1_UP_DOWN,
are input only and do not affect the operation of the DIO lines.
Timing Signal Routing
The DAQ-STC chip provides a flexible interface for connecting timing
signals to other devices or external circuitry. The NI 6013/6014 uses the
Programmable Function Input (PFI) pins on the I/O connector to connect
the device to external circuitry. These connections are designed to enable
the NI 6013/6014 to both control and be controlled by other devices and
circuits.
The DAQ-STC has 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. Figure 3-2 shows an example of the signal routing
multiplexer controlling the CONVERT* signal.
Figure 3-2. CONVERT* Signal Routing
Figure 3-2 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.
Many of these timing signals are also available on the PFI pins, as indicated
in Chapter 4,
Connecting Signals .
PFI<0..9>
CONVERT*
Sample Interval Counter TC
GPCTR0_OUT