National Instruments NI 6013 User Manual

Also see for NI 6013: Note to Users

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National Instruments NI 6013 User Manual Manual pdf 60 page image

Chapter 4 Connecting SignalsNI 6013/6014 User Manual 4-34 ni.comThe maximum allowed frequency is 20 MHz, with a minimum pulse widthof 23 ns high or low. There is no minimum frequency limitation.Either the 20 MHz or 100 kHz internal timebase normally generatesUISOURCE unless you select some external source.General-Purpose Timing Signal ConnectionsThe general-purpose timing signals are GPCTR0_SOURCE,GPCTR0_GATE, GPCTR0_OUT, GPCTR0_UP_DOWN,GPCTR1_SOURCE, GPCTR1_GATE, GPCTR1_OUT,GPCTR1_UP_DOWN, and FREQ_OUT.GPCTR0_SOURCE SignalAny PFI pin can externally input the GPCTR0_SOURCE signal, which isavailable as an output on the PFI8/GPCTR0_SOURCE pin.As an input, GPCTR0_SOURCE is configured in the edge-detection mode.You can select any PFI pin as the source for GPCTR0_SOURCE andconfigure the polarity selection for either rising or falling edge.As an output, GPCTR0_SOURCE reflects the actual clock connected togeneral-purpose counter 0, even if another PFI externally inputs the sourceclock. This output is set to high-impedance at startup.Figure 4-29 shows the timing requirements for GPCTR0_SOURCE.Figure 4-29. GPCTR0_SOURCE Signal TimingThe maximum allowed frequency is 20 MHz, with a minimum pulse widthof 23 ns high or low. There is no minimum frequency limitation.The 20 MHz or 100 kHz timebase normally generates GPCTR0_SOURCEunless you select some external source.tw = 23 ns minimumtp = 50 ns minimumtwtwtp