© National Instruments
|
2-13
DO Sample Clock Signal
The device uses the DO Sample Clock (do/SampleClock) signal to update the DO terminals with
the next sample from the DO waveform generation FIFO. If the device receives a DO Sample
Clock when the FIFO is empty, it reports an underflow error to the host software.
By default, the NI 6612 routes the divided down DO Sample Clock Timebase to DO Sample
Clock. You can route many other signals to DO Sample Clock. To view the complete list of
possible routes, see the
Device Routes
tab in MAX. Refer to
Device Routing in MAX
in the
NI-DAQmx Help
or the
LabVIEW Help
for more information.
Routing DO Sample Clock to an Output Terminal
DO Sample Clock can be routed out to any PFI <0..39>, RTSI <0..7>, PXI_Trig <0..7>, or
PXIe-DSTARC terminal.
Other Timing Requirements
The DO timing engine internally generates DO Sample Clock unless configured to an external
source. DO Start Trigger starts the timing engine and either the software or hardware can stop it
after a finite generation completes. When using the DO timing engine, a configurable delay can
be configured from DO Start Trigger to the first DO Sample Clock pulse. By default, this delay
is two ticks of DO Sample Clock Timebase. Figure 2-8 shows the relationship of DO Sample
Clock to DO Start Trigger.
Figure 2-8.
DO Sample Clock and DO Start Trigger
DO Sample Clock Timebase Signal
The DO Sample Clock Timebase (do/SampleClockTimebase) signal is divided down to provide
a source for DO Sample Clock. By default, the NI 6612 routes the onboard 100 MHz timebase
to the DO Sample Clock Timebase. You can route many signals to DO Sample Clock Timebase.
To view the complete list of possible routes, see the
Device Routes
tab in MAX. Refer to
Device
Routing in MAX
in the
NI-DAQmx Help
or the
LabVIEW Help
for more information.
DO Sample Clock Timebase is not available as an output on the I/O connector.
DO
Sa
mple Clock Time
bas
e
DO
S
t
a
rt Trigger
DO
Sa
mple Clock
Del
a
y
from
S
t
a
rt
Trigger
Содержание NI 6612
Страница 1: ...PCIe 6612...
Страница 2: ...NI 6612 User Manual NI 6612 User Manual November 2013 374008B 01...
Страница 11: ...NI 6612 User Manual National Instruments xi Appendix B Technical Support and Professional Services...
Страница 94: ...National Instruments 7 1 7 Calibration For the NI 6612 calibration is not required...
