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Impact of SpaceWire networks on payload implementation and operation

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Title: Impact of SpaceWire networks on payload implementation and operation


1
Impact of SpaceWire networks on payload
implementation and operation
Alberto Donadoni Vitrociset c/o
ESA/ESTEC TOS-EDP
Luca Tunesi ESA/ESTEC TOS-EDP
2
Payload Processing Subsystem
High Speed Network SpaceWire
Low/Med. Speed BusCAN

High Capacity Memory
Data Compression
SpaceWire
RTI
Telemetry Formatter/ Encryption
RTI
RTI
DSP Processor
3
SpaceWire ECSS-E-50-12A standard Links,
Nodes and Routers
  • Links, nodes and routers possible
    implementations
  • Links, Nodes and Routers
  • From Physical Layer up to Character Layer
  • Network Layer partially covered

4
SpaceWire networks
  • Two or more SpaceWire nodes
  • Zero or more SpaceWire routing switches
  • Interconnected with SpaceWire links
  • Add bandwidth where required
  • Add redundant links where required

5
Path Addressing
  • destination is specified as router output port
    number
  • node 1 to node 3 lt3gtltcargogtltEOPgt
  • node 1 to node 8 lt4gtlt3gtlt2gtltcargogtltEOPgt

6
Logical Addressing
  • each destination has a unique logical address
  • each router has a list of which port(s) to send
    data out for each possible destination
  • node 1 to node with logical address 43
    lt43gtltcargogtltEOPgt
  • node 1 to node with logical address 163
    lt163gtltcargogtltEOPgt

4
Router R4
3
2
1
4
4
4
Router R1
Router R2
Router R3
3
2
1
3
2
1
3
2
1
N1
N2
N3
N4
N5
N6
N7
N8
N9
7
SpaceWire TopNet Technology for On-Board
Processing Networks with Extended Throughput
  • Network implementation
  • Network validation
  • Remote integration

8
Network implementation
  • Remote Terminal Interface
  • SnP SpaceWire Networking Protocols
  • Network functionalities
  • Transport functionalities

9
Network validation
  • Conformance analysis
  • Point to Point analysis
  • Protocol Analysis

10
SpaceWire Conformance Tester
  • Tests the conformance of interfaces to the
    SpaceWire standard
  • Testing level is dependant from the degree of
    cooperation of the interface under examination
  • State Machine operation
  • Normal Operation
  • Error Conditions

11
SpaceWire Link Monitor
  • Monitoring link status
  • Operating modes
  • stand-alone
  • connected to a Logic State Analyser /
    Oscilloscope

12
SpaceWire Protocol Analyser
  • Packets and Timecodes statistics
  • Cargo Analysis

13
Remote Integration
14
SpaceWire IP Tunnel
  • PC based implementation
  • Transmission of SpaceWire packets and timecodes
    through IP based networks ( internet / intranet )

15
SpaceWire, TopNet and Space Operations
  • Fault Detection Isolation and Recovery Exchange
    Level Errors

  • Disconnect error
  • Parity error
  • Escape sequence error
  • Character sequence error
  • Credit error
  • Detect error
  • Disconnect link
  • Report error to Network Level
  • Attempt to reconnect link

16
SpaceWire, TopNet and Space Operations
  • Fault Detection Isolation and Recovery Network
    Level Errors
  • Report error to Network Level
  • Terminate current packet with EEP
  • Spill current packet until EOP/EEP
  • If error occurs in source or destination node,
    flag error to application layer
  • If error occurs in switch node, flag error to
    external pins or internal register
  • Link error
  • EEP received
  • Invalid destination address
  • If error occurs in switch node, flag error to
    application layer
  • Discard the packet

17
Fault Detection Isolation and Recovery node
failure and Network Reconfiguration
MEMORY 1
R
R
P 1
P 2
SENSOR 1
R
SENSOR 2
R
P 3
P 4
R
R
Processor Array
MEMORY 2
18
Fault Detection Isolation and Recovery link
failure and Network Reconfiguration
MEMORY 1
R
R
P 1
P 2
SENSOR 1
R
SENSOR 2
R
P 3
P 4
R
R
Processor Array
MEMORY 2
19
SpaceWire, TopNet and Space Operations
  • Implementation, validation and integration of
    payloads
  • Network Integrity (Fault Detection, Isolation and
    Recovery)
  • Dynamic network reconfiguration during operations
    (Logical addressing also in case of node failure)

20
The ECSS-E-50-12A SpaceWire standard can be
downloaded at www.ecss.nlQuestions?
Alberto Donadoni Vitrociset c/o
ESA TOS-EDP Tel. 31 71 5656633 E-mail
alberto.donadoni_at_esa.int
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