WHITE BROWN DA 918 Uživatelský manuál stáhnout pdf (Strana 109)

5-40 | ni.com

Chapter 5 Counters

80 MHz Source Mode

In 80 MHz source mode, the chassis synchronizes signals on the rising edge of the source, and

counts on the third rising edge of the source. Edges are pipelined so no counts are lost, as shown

in Figure 5-38.

Figure 5-38. 80 MHz Source Mode

External or Internal Source Less than 20 MHz

With an external or internal source less than 20 MHz, the module generates a delayed Source

signal by delaying the Source signal by several nanoseconds. The chassis synchronizes signals

on the rising edge of the delayed Source signal, and counts on the following rising edge of the

source, as shown in Figure 5-39.

Figure 5-39. External or Internal Source Less than 20 MHz

80 MHz Source

Synchronize Count

Source

Delayed Source

Synchronize

Count

1 2 ... 104 105 106 107 108 109 110 111 112 113 114 ... 126 127

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WHITE BROWN DA 918 Uživatelský manuál Strana 109