National Instruments AT E Series - Manual (Page 95)

Chapter 4 Connecting Signals
AT E Series User Manual 4-48 ni.com
As an output, the GPCTR1_GATE signal monitors the actual gate signal
connected to general-purpose counter 1, even if the gate is being externally
generated by another PFI. This output is set to high-impedance at startup.
Figure 4-35 shows the timing requirements for the GPCTR1_GATE signal.
Figure 4-35. 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 device 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 output is set to high-impedance at startup. Figure 4-36 shows
the timing requirements for the GPCTR1_OUT signal.
Figure 4-36. GPCTR1_OUT Signal Timing
GPCTR1_UP_DOWN Signal
This signal can be externally input on the DIO7 pin and is not available as
an output on the I/O connector. General-purpose counter 1 counts down
when this pin is at a logic low and counts up at a logic high. This input can
be disabled so that software can control the up-down functionality and
Rising-Edge
Polarity
Falling-Edge
Polarity
t
w
= 10 ns minimum
t
w
GPCTR1_SOURCE
GPCTR1_OUT
GPCTR1_OUT
(Toggle Output on TC)
(Pulse on TC)
TC