General-Purpose Counter Signal Timing; Ctr1 Clk Signal - Measurement Computing PCI-DAS6013 User Manual

PCI-DAS6013 and PCI-DAS6014 User's Guide

General-purpose counter signal timing

The general-purpose counter signals are:
CTR1 CLK
CTR1 GATE
CTR1 OUT
CTR2 CLK
CTR2 GATE
CTR2 OUT

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 4-20 shows the timing requirements for the CTR1 CLK signal.
t =100 ns minimum
p
t
w-H
t =15 ns minimum
w-H
t =25 ns minimum
w-L
Figure 4-20. CTR1 CLK Signal Timing
t
w-L
4-13
Functional Details