Chapter 4
Connecting Signals
4-38
ni.com
Figure 4-33 shows the timing requirements for GPCTR1_GATE.
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.
GPCTR1_OUT 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 4-34 shows the timing requirements for GPCTR1_OUT.
Figure 4-34.
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 leave the DIO7 pin free for general use. Figure 4-35 shows the timing
requirements for the GATE and SOURCE input signals and the timing
specifications for the OUT output signals of the device.
Rising-Edge
Polarity
Falling-Edge
Polarity
t
w
= 10 ns minimum
t
w
Rising-Edge
Polarity
Falling-Edge
Polarity
t
w
= 10 ns minimum
t
w
