NSSC-I stored command processing

• 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

Previous slide

Next slide

Back to first slide

View graphic version