Chapter 3 Signal Connections
© National Instruments Corporation 3-11 NI 660x User Manual
Figure 3-3 shows the timing requirements for the CtrnSource signal.
Figure 3-3. Timing Requirements for CtrnSource Signal
Figure 3-3 shows the minimum period and pulse width that you must use
for the CtrnSource signal. This signal must satisfy both minimum criteria.
If the high phase of the CtrnSource signal is Tsrcpw ns, the low phase must
be Tsrcper – Tsrcpw.
The minimum pulse width and period listed in Table 3-4 is the minimum
required for the internal signals. The TIO device has signal requirements in
order to pass through the isolation circuitry. For more information about
these signal requirements, refer to the NI 660x Specifications document,
which is available at
ni.com/manuals.
Table 3-4. Minimum Pulse Width for CtrnSource Internal Signals
Parameter
Minimum
Minimum with
RTSI Connector
DescriptionNI 6601 NI 6602
Tsrcpw (without
prescaling)
5 ns 5 ns 5 ns CtrnSource minimum pulse
width (without prescaling)
Tsrcpw (with
prescaling)
3.5 ns 3.5 ns 3.5 ns CtrnSource minimum pulse
width (with prescaling)
Tsrcper (without
prescaling)
50 ns 12.5 ns 50 ns CtrnSource minimum period
(without prescaling)
Tsrcper (with
prescaling)
16.67 ns 8 ns 16.67 ns CtrnSource minimum period
(with prescaling)
CtrnSource
Tsrcpw
Tgatepw
Tsrcper
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