4Links Multi-link SpaceWire Recorder Version 4 User Manual

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7. The MSR Options
The Multi-link SpaceWire Recorder can be specified with optional Event / Error Recording (ER), Time Tag (TT) and
Event / Error Waveforms (EW) functions that considerably extend the capabilities of the standard product.
7.1. Option TT - Time-Tags
An internal quartz crystal controlled oscillator feeds a counter that records the time, to a resolution of less than 2
ns, from power-up of the unit. That time can be captured and reported to the user each time an enabled event
occurs. This option allows time capture on the receipt of one or more of these events:
 the first byte of a packet;
 the end-of-packet marker, EOP;
 the error-end-of-packet marker, EEP;
 SpaceWire time codes;
 ECSS errors: ESC-ESC, ESC-EOP, ESC-EEP, Timeout, Parity error.
Delta time-tags are used when the interval between time-tags is short (<∼6.5µs) which reduces the Ethernet size
of a time-tag from ten to four bytes and thus reduces the traffic generated by time-tags.
The time-tags recorded by the MSR may be synchronised with those of other 4Links MSRs, DSIs and SRRs to an
accuracy of better than 10 ns, and all of these may be synchronised to a time-of-day year IRIG-B00x clock using a
4Links Absolute Time Interface (ATI) unit.
7.2. Option ER - Event / Error Reporting
Normally, only data and EOP/EEP characters are seen by the user. Other sequences and tokens or token-
sequences are hidden, some because they cause error conditions and result in a link being reset (possibly thus
also generating an EEP character).
This option allows selected events to be seen by the user for diagnostic purposes.
Events reported by this option are when:
 Time codes are received;
 ECSS errors, ESC-ESC, ESC-EOP, ESC-EEP, Timeout, Parity error, are received.

4Links Multi-link SpaceWire Recorder Version 4 Specifications

General

Brand	4Links
Model	Multi-link SpaceWire Recorder Version 4
Category	Measuring Instruments
Language	English