MA28140 Datasheet, PDF (71/72 Pages) Dynex Semiconductor – Packet Telecommand Decoder

12. SYNONYMS
AD
ASIC
AU(S)
BC
BD
CCSDS
CLCW
CLTU
CPDU(S)
CRC
ESA
FAR
FARM
GPS
ID
LAC
LFSR
LSB
MAP
MSB
NOP
Accepted Data Frame (accepted by the FARM)
Application Specific Integrated Circuit
Authentication Unit (Status)
Bypass Control Frame
Bypass Data Frame
Consultative Committee for Space Data Systems
Command Link Control Word
Command Link Transmission Unit
Command Pulse Distribution Unit (Status)
Cyclic Redundant Code
European Space Agency
Frame Analysis Report
Frame Acceptance and Reporting Mechanism
GEC Plessey Semiconductors
Identifier
Logical Authentication Channel
Linear Feedback Shift Register
Least Significant Bit
Multiplexed Access Point
Most Significant Bit
No Operation
MA28140
NRZ(-L)
N(S)
NW
PLOP
PSK
PSS
PTD
PW
RAM
RF
ROM
EEPROM
SEU
SOS
TC
TM
VC
VCM
V(R)
W
Non Return to Zero (Level)
Frame Sequence Number of a transmitted TC Frame
Negative Window
Physical Layer Operation Procedure
Phase Shift Keying
Procedures, Specification and Standards
Packet Telecommand Decoder
Positive Window
Random Access Memory
Radio Frequency
Read Only Memory
Electrically Erasable Programmable ROM
Single Event Upset
Silicon On Sapphire
Telecommand
Telemetry
Virtual Channel
Virtual Channel Multiplexer
The next expected TC frame sequence number
FARM Sliding Window Width (variable of the FARM)
13. APPLICATIONS
Note 1: Failure/Problem Description
The CPDU I/F generates continuously false output signals in
the event that "External Authentication" and "0 octet AU
Trailers" are used (i.e. AUDIS='0', AUEXT='1' and
AUTSL='1'). This malfunction is particularly critical for
applications using the CPDU I/F for its intended purpose to
handle emergency situations.
After generating a first sequence or correct output signals,
the state machine driving the CPDU I/F will get caught in a
never-ending loop of states and continue to generate false
(pseudo-random) output signals until the PTD is reset by
RESTN='0' or AUDIS='1'. No other command will stop the
erroneous outputs of the CPDU I/F.
Recommended action by users
The following combination of signal states must not be used :
AUDIS='0', AUEXT='1' and AUTSL='1'. This can be ensured
by either hardwiring on the PCB or appropriate SW
provisions. All users are strongly advised to validate the
functionality of the CPDU I/F operation for their choice of
operation modes.
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