參數(shù)資料
型號： MA28140
廠商： Dynex Semiconductor Ltd.
英文描述： Packet Telecommand Decoder
中文描述： 包遙控解碼器
文件頁數(shù)： 5/72頁
文件大?。?/td> 857K
代理商： MA28140
MA28140
5/72
F
igure 3: CCSDS Protocol Layer Architecture
ACQUISITION
SEQUENCE
16 OCTETS
FIRST CLTU
306 OCTETS
IDLE SEQUENCE
MIN. 1 OCTET
LAST CLTU
34 OCTETS
IDLE SEQUENCE
(OPTIONAL)
CODEBLOCK
No.1
CODEBLOCK
No.2
CODEBLOCK
No.36
CODEBLOCK
No.37
START
SEQUENCE
INFOR-
MATION
ERROR
CONTROL
E.C.
E.C.
E.C.
FILL
E.C.
SETAIL
1
1
1
3
1
8
4
7
7
1
7
2
FRAME
HEADER
5
FRAME DATA
FIELD
249 (MAX.)
FRAME
CONTROL
2
FRAME
HEADER
5
FRAME DATA
FIELD
9
FRAME
CONTROL
2
SEGMENT
HEADER
1 OCTET
FIRST PACKET
SEGMENT
248 OCTETS
SEGMENT
HEADER
1
LAST PACKET
SEGMENT
8
ERROR
CONTROL
PACKET
DATA
PACKET
HEADER
EXAMPLE : 256 OCTETS
PACKETISATION
LAYER
SEGMENTATION
LAYER
TRANSFER
LAYER
CODING
LAYER
(CODEBLOCK
LENGTH = 8
OCTETS)
PHYSICAL
LAYER
(ESA PLOP-2)
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.
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