National Instruments VXI-MIO Series - Manual (Page 88)

Chapter 4 Signal Connections
VXI-MIO Series User Manual 4-42  National Instruments Corporation
configure the polarity selection for either rising or falling edge. You can
use the gate signal in a variety of different applications to perform such
actions as starting and stopping the counter, generating interrupts,
saving the counter contents, and so on.
As an output, the GPCTR1_GATE signal monitors the actual gate
signal connected to general-purpose counter 1. This is true even if the
gate is being externally generated by another PFI. This signal is set to
input (High-Z) at startup.
Figure 4-33 shows the timing requirements for the GPCTR1_GATE
signal.
Figure 4-33. GPCTR1_GATE Signal Timing in Edge-Detection Mode
GPCTR1_OUT Signal
This signal is available only as an output on the GPCTR1_OUT pin.
The GPCTR1_OUT signal monitors the TC module general-purpose
counter 1. You have two software-selectable output options—pulse on
TC and toggle output polarity on TC. The output polarity is software-
selectable for both options. This signal is set to input (High-Z) at
startup. Figure 4-34 shows the timing requirements for the
GPCTR1_OUT signal.
Rising-edge
polarity
Falling-edge
polarity
t
w
t
w
= 10 ns minimum