NSSC-I stored command processing

Äîêóìåíò âçÿò èç êýøà ïîèñêîâîé ìàøèíû. Àäðåñ îðèãèíàëüíîãî äîêóìåíòà : http://www.stsci.edu/hst/training/events/HowHSTWorks/SSD990225/tsld027.htm
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Äàòà èíäåêñèðîâàíèÿ: Sun Dec 23 18:43:53 2007
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Absolute time processor
- Command execution times have one second resolution
- Implements basic SI timeline
- By convention, does not execute any commands which reconfigure SI hardware
- Can shut off entire processor, cannot shut off by SI
- Currently mostly populated by data which gets forwarded to SI computers

Relative time processor
- Commands have delta time specifications, no absolute specifications
- 6 different processors can run at once, one for each SI and one for SIC&DH itself
- Processors can be shut off individually (allows continuation of timeline with other SIs)
- Common Pool Command sequences (RTCSs) are routinely loaded from the ground
  - Some Common pool sequences are used for one-time execution (e.g. for a single exposure)
  - Some Common pool sequences are permanently on-board
- SI unique sequences are part of the code and not routinely changed
  - Flight software can write SI-unique RTCSs which are then executed

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NSSC-I stored command processing

Absolute time processor

Relative time processor