MA28140 Datasheet, PDF (26/72 Pages) Dynex Semiconductor – Packet Telecommand Decoder

MA28140
BI TS
31 (LSB)
VALUE
100
101
110
111
0
MEANI NG
REJECTED SEGMENT QUALIFIER
Error in Signature
Error in LAC
Wrong format (not executable) of authorised Authentication
Control Command (includes Segment Header)
Wrong length of TC Segment prior to being authenticated
(authorised), i.e. length shorter than 10 octets
set to 0
A few specific points need to be detailed:
Note 1: The abandoned CLTU state (000) is used to
indicate:
• the Cold Start
• a first TC codeblock of CLTU was abandoned (erased)
because of event 4 or event 2
• an event E2(a) channel deactivation occurs (see section
4.1)
• an event E2(b) CLTU error occurs (see section 4.1)
In the case of an Abandoned CLTU the Legal/lllegal
Frame Qualifier (bits 4, 5, 6) is set to 000 and the Legal
Frame Qualifier (bits 16, 17) is set to No Report on Legal
Frame (01).
Note 2: The rejected segment qualifier in the
Authentication process analysis has the following
prioritisation:
• 111 Too short TC segment has the highest precedence,
followed by
• 100 Error in Signature, followed by
• 101 Error in LAC, followed by
• 110 Wrong format of AU command or segmentation
flags.
The FAR is sampled and read by a telemetry interface
described in section 5.3.
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