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Functional Description and Specifications RUB SW
2.2 Word Clock Monitoring
2.2.1
Overview
SW
monitors 2 x 4 word clock signals. After the power has turned on, the monitoring starts if
once a valid signal has been received.
At each of the 2 x 4 word clock signals, the following measurements will be taken:
•
Signal level
•
Signal frequency
•
Drift compared to the PPS of a reference
Furthermore, the signals within a signal pair will be checked. There are four signal pairs:
IN1:
IN2:
CLOCK IN 1_1
CLOCK IN 2_1
CLOCK IN 1_2
CLOCK IN 2_2
CLOCK IN 1_3
CLOCK IN 2_3
CLOCK IN 1_4
CLOCK IN 2_4
The signals within a signal pair will be checked against:
•
Equal frequency
•
Signal to signal drift
Apart from measurement results, each individual check outputs a status, an error counter, and
a fail indication. The fail indication can be disabled. Please refer to the next chapters for
details.
