ACE1553-3U-4 Hardware Manual
14
IRIG- and Time Code Section
3.5
The main functions of the Time Code Processor (TCP) are:
IRIG-B compatible Time Code Decoder function
Time code Encoder
– IRIG-B compatible Time Encoder function
3.5.1 Time Code Encoder/Decoder
The generated time code signal is an IRIG-B compatible sinusoidal waveform. The time code
information can be used for time-tagging and multi-channel synchronization. On the ACE1553-
3U-4 a new generation IRIG-B section is implemented with a free-wheeling IRIG functionality. If
no external IRIG signal is detected, the TCP switches automatically to the free-wheeling mode.
Also, if an external IRIG-B signal is detected in free-wheeling mode, the Time tag is
automatically synchronized to this external IRIG-B signal.
The time tag on the board is generated in the format explained in the following table:
Time Element
Number of bits
DAYS of Year
9
HOURS of Day
5
MINUTES of Hour
6
SECONDS of Minute
6
MICROSECONDS of Second
20
Summary
46 (6 Bytes, stored in two 32bit words)
Table 3.2: IRIG-B: Binary Coded Time Tag
3.5.2 Time Tag Methods
The IRIG-IN and IRIG-OUT signals shall be connected depending on the Time synchronisation
method used as shown below.
1. Single AIM-Module No External IRIG-B Source
No connection required
2. Multiple AIM-Modules with No Common Synchronization Requirement
No connection required
3. Single or Multiple AIM-Module(s) with External IRIG-B Source
Connect external IRIG-B source to IRIG-IN and GND of all modules
4.
Multiple AIM-Modules with No External IRIG-B Source Internally Synchronized.
Connect the IRIG-OUT signal and the GND of the module you have chosen as the time
master to all IRIG-IN signals (including the time master).
Summary of Contents for ACE1553-3U-4
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