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Table 7-6. synchronization mode conditions, 80 mhz source mode, Figure 7-34. 80 mhz source mode – National Instruments NI 6238 User Manual

Page 104: Other internal source mode, Synchronization modes -38, Other internal source mode -39

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Chapter 7

Counters

© National Instruments Corporation

7-39

NI 6238/6239 User Manual

Otherwise, the mode depends on the signal that drives Counter n Source.
Table 7-6 describes the conditions for each mode.

80 MHz Source Mode

In 80 MHz source mode, the device synchronizes signals on the rising edge
of the source, and counts on the following rising edge of the source, as
shown in Figure 7-34.

Figure 7-34. 80 MHz Source Mode

Other Internal Source Mode

In other internal source mode, the device synchronizes signals on the
falling edge of the source, and counts on the following rising edge of the
source, as shown in Figure 7-35.

Table 7-6. Synchronization Mode Conditions

Duplicate

Count

Prevention

Enabled

Type of

Measurement

Signal Driving

Counter n

Source

Synchronization

Mode

Yes

Any

Any

80 MHz Source

No

Position
Measurement

Any

80 MHz Source

No

Any

80 MHz
Timebase

80 MHz Source

No

All Except
Position
Measurement

20 MHz
Timebase, 100
kHz Timebase,
or PXI_CLK10

Other Internal
Source

No

All Except
Position
Measurement

Any Other
Signal (such as
PFI or RTSI)

External Source

Source

Synchronize

Count

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