National Instruments VXI-MIO Series , SCANCLK Signal, EXTSTROBE* Signal

Chapter 4 Signal Connections
VXI-MIO Series User Manual 4-26  National Instruments Corporation
Figure 4-12. Typical Pretriggered Acquisition
SCANCLK Signal
SCANCLK is an output-only signal that generates a pulse with the
leading edge occurring approximately 50 to 100 ns after an A/D
conversion begins. The polarity of this output is software selectable but
is typically configured so that a low-to-high leading edge can clock
external analog input multiplexers indicating when the input signal has
been sampled and can be removed. This signal has a 400 to 500 ns pulse
width and is software-enabled. Figure 4-13 shows the timing for the
SCANCLK signal.
Figure 4-13. SCANCLK Signal Timing
EXTSTROBE* Signal
EXTSTROBE* is an output-only signal that generates either a single
pulse or a sequence of eight pulses in the hardware-strobe mode. An
external device can use this signal to latch signals or to trigger events.
In the single-pulse mode, your software controls the EXTSTROBE*
Don't Care
01231 0222
TRIG1
TRIG2
STARTSCAN
CONVERT*
Scan Counter
tw
tw= 400 to 500 ns
td= 50 to 100 ns
td
CONVERT*
SCANCLK