Ctr2 Clk Signal; Ctr2 Gate Signal - Measurement Computing PCI-DAS6013 User Manual

PCI-DAS6013 and PCI-DAS6014 User's Guide

CTR2 CLK signal

The CTR2 CLK signal can serve as the clock source for independent user counter 2. It
can be selected through software at the CTR2 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 4-23

CTR2 GATE signal

You can use the CTR2 GATE signal for starting and stopping the counter, saving
counter contents, etc. It is polarity programmable and is available at the CTR2 GATE
pin.
Figure 4-24
Rising Edge Polarity
Falling Edge Polarity
shows the timing requirements for the CTR2 CLK signal.
t =100 ns minimum
p
t
w-H
t =15 ns minimum
w-H
t =25 ns minimum
w-L
Figure 4-23. CTR2 CLK Signal Timing
shows the timing requirements for the CTR2 GATE signal.
Figure 4-24. CTR2 GATE Signal Timing
t
w-L
t
t = 25 ns minimum
w
4-15
w
Functional Details