Ctr1 Clk Signal; Ctr1 Gate Signal - Measurement Computing PCI-DAS6034 User Manual

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PCI-DAS6034 & PCI-DAS6035 User's Guide

4.4.1 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 4-19 shows the timing requirements for the CTR1 CLK 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. See Figure

4-20 for the minimum timing specification.

Figure 4-19. CTR1 CLK Signal Timing

Figure 4-20. CTR1 GATE Signal Timing

4–14

Functional Description

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