General-Purpose Timing Signal Connections; Gpctr0_Source Signal; Figure 4-28. Uisource Signal Timing - National Instruments VXI-MIO Series User Manual

Chapter 4 Signal Connections

General-Purpose Timing Signal Connections

VXI-MIO Series User Manual
polarity selection for the PFI pin for either active high or active low.
Figure 4-28 shows the timing requirements for the UISOURCE signal.
t
w

Figure 4-28. UISOURCE Signal Timing

The maximum allowed frequency is 20 MHz, with a minimum pulse
width of 23 ns high or low. There is no minimum frequency limitation.
Either the 20 MHz or 100 kHz internal timebase normally generates the
UISOURCE signal unless you select some external source.
The 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 Signal

Any PFI pin can externally input the GPCTR0_SOURCE signal, which
is available as an output on the PFI8/GPCTR0_SOURCE pin.
As an input, the GPCTR0_SOURCE signal is configured in the
edge-detection mode. You can select any PFI pin as the source for
GPCTR0_SOURCE and configure the polarity selection for either
rising or falling edge.
As an output, the GPCTR0_SOURCE signal reflects the actual clock
connected to general-purpose counter 0. This is true even if another PFI
is externally inputting the source clock. This signal is set to input
(High-Z) at startup.
t
p
t
w
t
= 50 ns minimum
p
t
= 23 ns minimum
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4-38 National Instruments Corporation