DNA/DNR-IRIG-650 IRIG Timing Layer
Chapter 1
8
Introduction
Tel: 508-921-4600
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Vers:
4.6
Date: March 2019
DNx-IRIG-650 Chap1x.fm
© Copyright 2019
United Electronic Industries, Inc.
The phase noise specification of the 20MHz oscillator is:
PHASE NOISE:10Hz OFFSET: -105dBc/Hz
100Hz OFFSET: -125dBc/Hz
1kHz OFFSET: -135dBc/Hz
10kHz OFFSET: -145dBc/Hz
The Time Keeper module can use either raw binary seconds or binary-coded
decimal (BCD) seconds/minutes/hours from the input code to read the current
time.
The Time Assembler module accepts the current time from the Time Keeper and
uses it to create an output time code with Manchester II, AM, and DCLS coding.
(Note that the output format does not have to be the same format as an input.)
In addition to the time keeping & generating functionality described above, the
IRIG-650 also provides event recording and event generating functions.
Event recording
allows you to timestamp and store locations of up to four
events from the following event sources:
•
SYNC bus lines of the Cube or RACKtangle
•
External inputs
•
Errors (lost synchronization inputs, invalid 1 PPS, etc.)
•
Start/stop trigger broadcast commands
The above recorded events may be streamed into the output FIFO, which allows
you to synchronize data acquired by any other DNR/DNA boards with time that
is accurately kept by the IRIG-650 layer. The above recorded events can also be
routed to TTL or SYNCx lines.
Event generation
allows creation of one-time or repeatable events based on
the precise time that is maintained by the IRIG-650 layer. The maximum recom-
mended rate of events is 100 kHz and the maximum resolution is 10 nsec.
Event generation includes a digital PLL mode that generates a configurable
number of pulses per period (2MHz max), designed to adjust its period to a
1PPS source from the TimeKeeper or from a TTL input.