Chapter 3
Hardware Overview
©
National Instruments Corporation
3-5
Timing Signal Routing
The DAQ-STC chip provides a flexible interface for connecting timing
signals to other devices or external circuitry. Your device uses the RTSI
bus to interconnect timing signals between devices, and 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 device to
both control and be controlled by other devices and circuits.
There are a total of 13 timing signals internal to the DAQ-STC 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
This figure shows that CONVERT* can be generated from a number of
sources, including the external signals RTSI<0..6> and PFI<0..9> and the
internal signals Sample Interval Counter TC and GPCTR0_OUT.
RTSI Trigger <0..6>
PFI<0..9>
CONVERT*
Sample Interval Counter TC
GPCTR0_OUT
