Gaia
GAIA.ASU.SP.ESM.00007
Issue 2.00
Page 15 of 79
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GAIA.ASU.SP.ESM.00007 (Avionics SCOE Req Iss 2).doc
3.5.3 Data Acquisition
AVI-2837/CREATED/T,R
Avionics SCOE data acquisition and data generation shall occur both synchronously and
asynchronously.
AVI-2839/CREATED/T
All data inputs to the Avionics SCOE from the Spacecraft Interfaces shall be acquired asynchronously
(such as pulses, address lines, bus acquisitions).
AVI-3547/CREATED/T
The acquisition of data inputs to the Avionics SCOE from the Spacecraft Interfaces shall be triggered
by the data itself.
AVI-4228/CREATED/T
The acquisition of all data inputs to the Avionics SCOE shall be possible in parallel.
AVI-3548/CREATED/T
For transfer to the RTS (closed-loop test mode), the data inputs shall be buffered and collected
synchronously by the RTS at the update rates defined in Appendix B, Table 11-1.
AVI-3546/CREATED/T
In closed-loop test mode, those outputs to the Spacecraft Interfaces controlled by the RTS shall be
updated synchronously on completion of the DMA write cycle from the RTS (see Section 3.8.1).
AVI-3601/CREATED/T
The update rates for those outputs to the Spacecraft Interfaces controlled by the RTS shall be as
defined in Appendix B, Table 11-1.
AVI-2849/CREATED/T
Asynchronous outputs to the Spacecraft Interfaces are data generated from asynchronous events -
such as commands from the CCS, the Avionics SCOE Software control loops or MMI. Such data shall
be updated and sent to the Spacecraft on demand.
AVI-3104/CREATED/T
All data both acquired and generated by the Avionics SCOE shall be:
• transferred to the CCS for processing and central archive - see Section 3.9.3.
• available to the Avionics SCOE MMI for local display and/or adaptation - see Section
3.9.5.
• archived locally when connection to the CCS is lost.
The data interface requirements between the Avionics SCOE and the Real Time Simulator are defined in
the individual Spacecraft Interface sections and summarized in Appendix B, Section 11.
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