Chapter 3
Analog Output Timing/Control
DAQ-STC Technical Reference Manual
3-2
©
National Instruments Corporation
3.1.1 Programming the AOTM
To program the AOTM module of the DAQ-STC, read section
,
and read this chapter through section
.
As you read section
, you will need to refer to section
. You will also need to consult the register-level programmer manual for the
device containing the DAQ-STC. You should not have to read section
.
3.2 Features
The AOTM has the following features:
•
Update interval timing
–
24-bit update interval down counter
–
Maximum update rate of 1.6 MHz on two output channels
–
Maximum frequency of 20 MHz yields 50 ns resolution with a maximum interval of
0.83 s
–
Divide-by-two timebase yields 100 ns resolution with a maximum interval of 1.67 s
–
Divide-by-200 timebase yields 10 µs resolution with a maximum interval of 167 s
•
Secondary update interval
–
16-bit counter with independent timebase selection for a secondary update group
that is primarily interrupt driven
•
External timing available for the following signals:
–
START1
–
UPDATE
–
UI source
–
UI2 source
–
Secondary external gate
•
Bidirectional external timing pins
–
Input clock sources and triggers from PFI<0..9> and RTSI_TRIGGER<0..6>
–
Output the internally generated update and trigger signals to the board
•
Programmable polarities for external UPDATE and external START1 input
•
Synchronously change the update interval
