DNA/DNR-IRIG-650 IRIG Timing Layer
Chapter 2
11
Programming with the High Level API
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Vers:
4.6
Date: March 2019
DNx-IRIG-650 Chap2x.fm
© Copyright 2019
United Electronic Industries, Inc.
It configures the following parameters:
•
1PPS source:
The 1PPS signal source, that can be any of the following
values:
•
Auto-follow:
If selected, external 1PPS source does not deliver pulses
(because of a break in timecode transmission, for example). The Time-
keeper can switch to internal timebase when externally derived one is
not available.
In addition you can set additional parameters using the channel object methods
(under LabVIEW use property node):
•
Nominal Value enabled:
Select whether to use nominal period (i.e.
100E6 pulses of 100MHz base clock) or the period measured by time-
keeper (it measures and averages number of base clock cycles
between externally derived 1PPS pulses when they are valid).
1PPS Source Value
Description
UeiIRIG1PPSInternal
1PPS signal is generated internally with
precision oscillator
UeiIRIG1PPSInputTimeCode
1PPS signal is derived from input timecode
UeiIRIG1PPSGPS
1PPS signal is derived from GPS
UeiIRIG1PPSRFIn
1PPS signal is derived from signal
connected on RF input
UeiIRIG1PPSExternalTTL0
External 1PPS signal is connected to TTL0
input pin
UeiIRIG1PPSExternalTTL1
External 1PPS signal is connected to TTL1
input pin
UeiIRIG1PPSExternalTTL2
External 1PPS signal is connected to TTL2
input pin
UeiIRIG1PPSExternalTTL3
External 1PPS signal is connected to TTL3
input pin
UeiIRIG1PPSExternalSync0
External 1PPS signal is connected to
SYNC0 bus line
UeiIRIG1PPSExternalSync1
External 1PPS signal is connected to
SYNC1 bus line
UeiIRIG1PPSExternalSync2
External 1PPS signal is connected to
SYNC2 bus line
UeiIRIG1PPSExternalSync3
External 1PPS signal is connected to
SYNC3 bus line
// enable nominal value
pTKChannel->EnableNominalValue(true);