ADLINK Technology PXIe-9834, User Manual, Page: 50 / 65

38 Operations
Leading
EDGE COMPUTING
To achieve sampling rates other than 80MS/s, the scan interval
counter (ScanIntrv) needs to be specified. For example, if the scan
interval counter is set to 2, the equivalent sampling rate is
80MS/s/2=40MS/s. If 3, the equivalent sampling rate is 80MS/s/3=
26.66MS/s, and vice versa. The scan interval counter is 16 bits in
width, therefore the lowest sampling rate is 1.121KS/s (80MS/s/
65535).
Table 3-4: Counter Parameters and Description
Counter Function Length Valid Value Comment
ScanIntrv
Scan
Interval
Counter
16-bit 1-65535
Timebase divider to
achieve equivalent
sampling rate of the
digitizer, when sampling
rate=timebase/
ScanIntrv
DataCnt
Data
Counter
31-bit 1-2147483647
Specifies the amount of
data to be acquired;
invalid when double
buffer mode (infinite
data number) is
selected for continuous
data sampling
trigDelayTicks
Delay
Trigger
Counter
16-bit 1-65535
Indicates time between
a trigger event and
commencement of
acquisition, where unit
of a delay counter is the
period of the timebase
(See “Delayed Trigger
Mode” on page 32.)
ReTrgCnt
Re-Trigger
Counter
31-bit 1-2147483647
Enables re-trigger to
accept multiple triggers
(See “Acquisition with
Re-Triggering” on
page 34.)