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Chapter 4 Signal Connections
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National Instruments Corporation 4-47 PCI-6023E/6024E/6025E User Manual
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 output is set to tri-state at
startup.
Figure 4-39 shows the timing requirements for the GPCTR1_GATE signal.
Figure 4-39. 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 board 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 tri-state at startup. Figure 4-40 shows
the timing requirements for the GPCTR1_OUT signal.
Figure 4-40. 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
t
w
= 10 ns minimum
GPCTR1_SOURCE
GPCTR1_OUT
GPCTR1_OUT
(Toggle output on TC)
(Pulse on TC)
TC
PCI.book Page 47 Wednesday, September 16, 1998 9:09 AM