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PDF MA28140 Data sheet ( Hoja de datos )
| Número de pieza | MA28140 | |
| Descripción | Packet Telecommand Decoder | |
| Fabricantes | Dynex | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MA28140 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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Replaces June 2000 version, DS3839-6.1
MAM2A821841400
Packet Telecommand Decoder
DS3839-7.0 September 2001
The MA28140 Packet Telecommand Decoder (PTD) is a
single-chip implementation of the core part of a telecommand
decoder, manufactured using CMOS-SOS high performance,
radiation hard, 1.5µm technology. The PTD is a full
implementation of and fully compliant with the packet
telecommand standard ESA PSS-04-107 and the
telecommand decoder specification ESA PSS-04-151, these
being derived from the corresponding CCSDS standards.
The PTD, which handles 6 NRZ TC input channels,
processes the following layers:
Coding Layer
Transfer Layer
Segmentation Layer
Authentication Layer
Command Pulse Distribution
Some of these layers have a telemetry reporting
mechanism. The processed TC segment can be transferred to
the application either serially or in parallel.
FEATURES
s Single Chip Implementation of all TC Decoder Core
Functions
s Built-in Authentication Unit
s Built-in Command Pulse Distribution Unit Core Logic
s Radiation Hard to 1MRads (Si)
s High SEU Immunity, Latch-up Free
s CMOS-SOS Technology
s Conforms to CCSDS Standards
s 6 NRZ TC Input Channels
s 50Kbps Bit Rate
s Low Power Consumption
s Single 5V Supply
s -55 to +125°C Operation
CLCWSA
RFAVN
CLCWCA
VCLSB
CLCWDA
TMMOD
CLCWSB
PAR
CLCWCB
RESETN
CLCWDB
CLK
CPDUS
PRIOR
FAR1S
TEST
FAR2S
MODE
AU1S
CONF
AU2S
SELTC(0-2)
TMC
DECOD
TMD
LADR(0-10)
PRDY
LDAT(0-7)
PBUS(0-15)
RWN
AUDIS
PTD
BRQN
BGRN
AUEXT
RAMCSN
AUST
ROMCSN
AUBUF
LACCS
AUEND
LACK
AUR
AUTSL
CPDUSTN
AUSBUF
CPDUEN
FARBUF
CPDUDIV
TCC0-5
TCS0-5
TCA0-5
12 VDD
14 GND
MAPSTN
MAPCK
MAPDSR
MAPDTR
MAPDATA
MAPADT
Pin connections
1/72
1 page  
MA28140
PACKETISATION
LAYER
SEGMENTATION
LAYER
PACKET
HEADER
EXAMPLE : 256 OCTETS
PACKET
DATA
PACKET
ERROR
CONTROL
1 OCTET
SEGMENT
HEADER
248 OCTETS
FIRST PACKET
SEGMENT
1
SEGMENT
HEADER
8
LAST PACKET
SEGMENT
TRANSFER
LAYER
5
FRAME
HEADER
249 (MAX.)
FRAME DATA
FIELD
2
FRAME
ERROR
CONTROL
5 92
FRAME
FRAME DATA
FRAME
ERROR
HEADER
FIELD
CONTROL
CODING
LAYER
(CODEBLOCK
LENGTH = 8
OCTETS)
2
START
SEQUENCE
71
INFOR- ERROR
MATION CONTROL
CODEBLOCK
No.1
71
E.C.
CODEBLOCK
No.2
1 714
31
8
E.C.
E.C.
FILL
E.C.
TAIL
SEQUENCE
CODEBLOCK
No.36
CODEBLOCK
No.37
PHYSICAL
LAYER
(ESA PLOP-2)
16 OCTETS
ACQUISITION
SEQUENCE
306 OCTETS
FIRST CLTU
MIN. 1 OCTET
IDLE SEQUENCE
34 OCTETS
LAST CLTU
IDLE SEQUENCE
(OPTIONAL)
Figure 3: CCSDS Protocol Layer Architecture
COMMAND PULSE DISTRIBUTION UNIT
The CPDU is integrated into the PTD ensuring higher
reliability for this critical function (direct telecommand for
spacecraft reconfiguration) than if implemented in an external
chip. The critical commands executed by the CPDU are
received in specific packets. The CPDU responds to the MAP
identifier 0, and to a mission dependent application process
identifier (stored in ROM). No segmentation is accepted, the
commands must be contained in an unsegmented package.
The unit generates a reporting word (CPDU Status = 16 bits).
BUS CONTROLLER
This block is the interface between external memories and
on chip modules. Its different functions are:
• address decoding.
• internal and external bus access arbitration.
TELEMETRY MODULE
This block is the interface with the telemetry subsystem. It
manages the data report storage using double buffered
registers.
5/72
5 Page 
POSITIVE WINDOW AREA = PW
N(S)=V(R)+PW-1
DISCARD FRAME &
SET RETRANSMIT
DISCARD
FLAG
N(S)=V(ARC)+C1EPT
FRAME &
SET V(R)=V(R)+1
FRAME & GO TO
LOCKOUT
N(S)=V(R)-1
STATE
N(S)=V(R)
DISCARD FRAME
MA28140
NEGATIVE WINDOW AREA = NW
Figure 5: The FARM Sliding Window Concept
A Frame Sequence Number N(S) falls outside the FARM Sliding Window i.e. in the Lockout Area when:
N(S)>V(R)+PW-1
N(S)<V(R)-NW
In this case, the Lockout flag is set.
When N(S) falls inside the FARM Sliding Window, one of the following three cases can occur:
• First case
N(S)=V(R)
The frame is accepted
• Second Case
N(S)>V(R) and
N(S)≤V(R)+PW-1
The frame is in the positive window and does not contain the expected Frame Sequence Number. The Frame is discarded
and the retransmit Flag is set.
• Third Case
N(S)<V(R) and
N(S)≥V(R)-NW
The frame is in the negative window and is discarded without any other action being taken.
11/72
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet MA28140.PDF ] | |
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