Aim APE1553-1-DS, Руководство по оборудованию

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APE1553-1/2(-DS) Hardware Manual
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3.1.6 IRIG-B Encoder/Decoder and Timecode Processor (TCP)
The IRIG-B time code will be received and decoded from the Timecode-Processor. The
decoded millisecond time code received from TCP is expanded by a self-generated
microsecond value and organized to a 46Bit time tag value.
The format is shown below:
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 3.1.7-1: Timetag Binary-Format
The IRIG-B time encoder generates the transmitted timecode sinusoidal signal.
The IRIG start-time can be set via software.
The time code information can be used for time-tagging and synchronization of multiple
channels.
If no external IRIG signal is detected or if the synchronisation to the external IRIG signal
gets lost, the TCP switches automatically to the free wheeling operation mode.
As soon as an external IRIG-B signal is detected in free wheeling mode, the Time tag is
automatically synchronized to this external IRIG-B signal.
3.1.7 Maintenance RS232 Interface
The System and Maintenance Controller is used for on board debugging and board
maintenance purposes in the factory.
3.1.8 External Trigger Inputs and Outputs
For Bus Controller (BC), Remote Terminal (RT) and Bus Monitor (BM) triggering,
separate trigger input and trigger output are provided for each MILbus channel at the
Front I/O connector.
3.1.9 User programmable General Purpose Discrete-I/O (GPIO)
The module provides eight General Purpose Discrete I/O's (GPIO’s).
The GPIO’s can be used as simple discrete inputs or outputs, for example to generate
strobes or to sample a digital input signal generated externally.