AAC Microtec Sirius TCM User Manual
Also see for Sirius OBC: User manual
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Contents
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Document number 205065Version Rev. NIssue date 2019-02-04Sirius OBC and TCM User Manualwww.aacmicrotec.com Page 117 of 174Table 7-16: Fallback TC Handler APIDParameter Value DescriptionTC Handler APID 0xAFFallback APID configuration of APID of TC Handler in TCMCore Application7.5. TelemetryTelemetry is simultaneously sent on all the transceiver interfaces, i.e. the RS422 (TRX1),the LVDS (TRX2) and umbilical (UMBI) interfaces. VC 0 and VC 1 are supported for TMData and VC 7 is reserved for idle-frames. The CCSDS IP generates complete TM TransferFrames from PUS packets. If a PUS packet does not fit in one TM Transfer Frame, theCCSDS module splits the packet into several TM Transfer Frames. If a PUS packet not doesfill the whole TM Transfer Frame, an idle-packet is added as padding to fill the frame. Thefollowing telemetry settings are configurable by RMAP-commands (see 7.12):• Divisor of TM Clock• Inclusion of CLCW of TM Transfer Frames• Inclusion of Frame Error Control Field of TM Transfer Frames• Updating of Master Channel Frame Counter• Idle frame generation (sent on VC7 when no data is sent on VC0 or VC1)• Convolutional encoding• Pseudo randomizationThe TCM-S supports the format of TM Transfer Frames described in [RD8].7.6. TelecommandsTelecommands can be received on the RS422 (TRX1), the LVDS (TRX2) or the umbilical(UMBI) interface.The TCM actively searches for Command Link Transmission Units (CLTU), i.e.telecommands, on all three inputs simultaneously (as long as they are enabled). When atelecommand start sequence is detected, the other inputs are ignored during telecommandreception. The search will restart once the entire telecommand is either received or areception error is detected. In short, the telecommand reception uses the following receptionlogic, also illustrated in• All incoming signals on the inputs are synchronized to the system clock domain.• The BCH decoder is configured in error-correcting mode• When the CLTU receptor has detected and decoded a start pattern, it sets an enablesignal for the active path, indicating that this CLTU receptor is now active. If one ormore bit-errors occur in the start pattern, the CLTU will be rejected, which is notcompliant to handling of one-bit errors described in [RD14] since one-bit errors shall becorrected when BCH decoder is configured in error-correcting mode.• The telecommand path activated is set until the reception status changes, i.e. thecurrent telecommand is finished and a new start pattern is detected correctly on adifferent CLTU path.• The selected telecommand clock, data and enable signals are now forwarded throughthe mux to the BCH decoder, rejecting data and clock on inactive data paths. |
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