MA28140 Datasheet, PDF (25/72 Pages) Dynex Semiconductor – Packet Telecommand Decoder

MA28140
Frame Analysis Report
The FAR is required for proper testing and check-out of the TC Decoder. The FAR consists of 32 bits of survey data formatted
as follows:
BI TS
0 (MSB)
VALUE
0
1
MEANI NG
STATUS OF SURVEY DATA
New survey data (or Cold Start)
Old survey data
1,2,3
FRAME ANALYSIS
Note: The report of the lowest rank (i.e. of lowest 3-bit value) has
precedence in case of conflicting states.
000
Abandoned CLTU (see Note 1)
001
Frame declared dirty
010
Frame declared illegal for one reason
011
Frame declared illegal for multiple reasons
100
Frame (AD) discarded because of LOCKOUT
101
Frame (AD) discarded because of WAIT
110
Frame (AD) discarded because of N(S) or V(R)
111
Frame (AD, BD or BC) Accepted by FARM-1
4,5,6
LEGAL/ILLEGAL FRAME QUALIFIER
Not e : When a frame is declared ILLEGAL for multiple reasons,
only the reason of the first rank (i.e. of lowest 3-bit value) is
reported. The fields mentioned are those of the frame header.
000
No illegal report (or Cold Start)
001
Error in fixed fields (Version & Reserved)
010
Illegal combination (AC) of Bypass & Control Command Flags
011
Wrong Spacecraft ID
100
Wrong VC ID (because of Bits 0 to 4 of ID)
101
Wrong VC ID (because of Bit 5 of ID)
110
N(S) of BC or BD frame not set to all 0
111
Wrong BC frame data format (not executable)
7 - 12
xxxxxx
COUNT OF ACCEPTED CODE BLOCKS PER CLTU
Straight 6-bit binary count of correct or single-error-corrected
codeblocks in one CLTU; (Cold Start value: 000000)
13,14,15
COUNT OF SINGLE-ERROR CORRECTIONS PER CLTU
xxx
Straight 3-bit binary count, saturates at maximum value, no roll
over. (Cold Start value:000)
16,17
LEGAL FRAME QUALIFIER (4 STATES)
00
AD frame
01
No report on legal frame (or Cold Start)
10
BD frame
11
BC frame
18,19,20
SELECTED CHANNEL INPUT (MAXIMUM CAPABILITY : 6
INPUTS)
xxx
(Cold Start value : 111)
21 - 26
xxxxxx
LAST MAP ADDRESSED (64 MAPS)
(Cold Start value : 111111)
27
0
RESERVED BY ESA (set to 0)
28,29,30
AUTHENTICATION PROCESS ANALYSIS
000
No authentication report (or Cold Start)
AUTHORISED SEGMENT QUALIFIER
001
Authorised data segment
010
Authorised (and executable) Authentication Control Command
011
Authorised dummy segment received
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