PCI-DAS6052 User's Guide
Functional Details
CTR1 CLK signal
The CTR1 CLK signal can serve as the clock source for independent user counter 1. It
can be selected through software at the CTR1 CLK pin rather than using the on-board
10 MHz or 100 kHz sources. It is also polarity programmable. The maximum input
frequency is 10 MHz. There is no minimum frequency specified.
Figure 4-28
Figure 4-28. CTR1 CLK Signal Timing
shows the timing requirements for the CTR1 CLK signal.
t
w-L
t
w-H
=15 ns minimum
t
w-H
t
p
=100 ns minimum
t
w-L
=25 ns minimum
CTR1 GATE signal
You can use the CTR1 GATE signal for starting and stopping the counter, saving
counter contents, etc. It is polarity programmable and is available at the CTR1 GATE
pin.
Figure 4-29
Figure 4-29. CTR1 GATE Signal Timing
shows the minimum timing requirements for the CTR1 GATE signal.
Rising Edge Polarity
t
w
t
w
= 25 ns minimum
Falling Edge Polarity
4-24
