1. SpaceFibre Flight Software Workshop 2015
Steve Parkes, University of Dundee
Albert Ferrer Florit, Alberto Gonzalez Villafranca, STAR-Dundee Ltd.
David McLaren, Chris McClements, University of Dundee

2. Contents SpaceFibre SpaceFibre standard
SpaceFibre integrated quality of service
SpaceFibre networks
SpaceFibre cables and connectors
SpaceFibre test and development equipment
SpaceFibre chip designs
SpaceFibre in radiation tolerant FPGAs

3. SpaceFibre

4. SpaceFibre SpaceFibre is SpaceFibre runs over
A spacecraft on-board data link and network
SpaceFibre runs over
Electrical and fibre optic cables
SpaceFibre designed specifically for spaceflight applications
Integrated QoS
Integrated FDIR capabilities
Galvanic isolation

5. SpaceFibre Key Features
High performance
2.5 Gbits/s current flight qualified technology
3.125 Gbits/s soon (6.25 Gbits/s coming)
Multi laning of up to 16 lanes (40 Gbits/s)
Innovative integrated QoS
Priority
Bandwidth reservation
Scheduling
Novel integrated FDIR support
Transparent recovery from transient errors
Error containment in virtual channels and frames
“Babbling Node” protection
Low latency
Broadcast codes
Compatible with SpaceWire at packet level

6. SpaceFibre Benefits Supports high data-rate instruments (e.g. SAR)
Very high data rates
Reduces cost, schedule and risk
Reduction of harness mass
Simplification of redundancy
Increase in reliability
Straightforward error recovery
Very small footprint due to efficient design
Supports integrated AOCS/GNC and payload network
Quality of service
Deterministic data delivery
Supports launcher applications
Long distance
Galvanic isolation
Easy to integrate with existing SpaceWire equipment

7. Integrated Network Single integrated network Carrying
Instrument data
Configuration and control information
Deterministic traffic
High resolution time information
Event signals
Improves reliability, mass, cost

8. SpaceFibre Standard

9. SpaceFibre Standard ECSS User Application Management Layer Parameters
Packets
Broadcast Messages
Packets
Broadcast Messages
Nodes
Routers and routing
Message broadcast
Packet definition
Network Layer
NChars
Broadcast Messages
NChars
Broadcast Messages
Link operation
Quality of service
Link error recovery
Data Link Layer
Data & Control Words
Data & Control Words
Multi-Lane Layer
Lane coordination
Lane failure recovery
Lane Control
Data & Control Words
Data & Control Words
Lane Status
Lane initialisation
Encoding of data & control words
SerDes
Lane Layer
Physical
Control
TX Symbols
RX Symbols
Physical
Status
Driver/Receiver
Cables
Connectors
Physical Layer

10. SpaceFibre ECSS Working Group
User Application
Broadcast Messages
Broadcast Messages
Parameters
Packets
Packets
Nodes
Routers and routing
Message broadcast
Packet definition
Network Layer
Broadcast Codes
Broadcast Codes
NChars
NChars
Link operation
Quality of service
Link error recovery
Data Link Layer
Data & Control Words
Data & Control Words
Management Layer
Multi-Lane Layer
Lane coordination
Lane failure recovery
Data & Control Words
Data & Control Words
Lane Control
Lane Status
Lane initialisation
Encoding of data & control words
SerDes
Lane Layer
Physical
Control
Physical
Status
TX Symbols
RX Symbols
Driver/Receiver
Cables
Connectors
Physical Layer

11. SpaceFibre Integrated QoS

12. SpaceWire CODEC Packet Interface Time-Codes Management SpaceWire CODEC
Serial

13. … SpaceFibre IP Core Each VC like pair of SpW FIFOs.
Sends and Receives SpFi packets
Broadcasts short messages.
Time distribution, synchronisation, event signalling, error handling
Management interface configures VCs, BC, etc
Virtual Channel Interfaces
Broadcast
Management …
SpaceFibre IP Core
SerDes

14. SpaceFibre Quality of Service
Integrated QoS scheme
Priority
VC with highest priority
Bandwidth reserved
VC with allocated bandwidth and recent low utilisation
Scheduled
Synchronised time-slots
E.g. by broadcast messages
VCs allocated to specific time-slots
In allocated time-slot, VC allowed to send
“Integrated” because
All three QoS work together
QoS is implemented in the hardware of the SpaceFibre interface

15. Virtual Channels VC sends when
MAC
DEMUX
VC2
VC3
VC3
VC sends when
Source VC buffer has data to send
Destination VC buffer has space in buffer
QoS for VC results in highest precedence
A SpW packet flowing through one VC does not block another packet flowing through another VC

16. QoS: Bandwidth Reserved
Precedence
Bandwidth Credit Counter
time

17. QoS: Bandwidth Reserved
Precedence
time

18. QoS Priority
time
Priority 1
Priority 2
Priority 3

19. QoS Babbling Idiot Protection
time
Priority 1
Priority 2
Priority 3

20. Scheduled Precedence Time-slot 1 2 3 4 5 6 7 8 VC 1 VC 2 VC 3 VC 4

21. Configured for Priority and BW Reserved Only
Time-slot 1 2 3 4 5 6 7 8
VC 1
VC 2
VC 3
VC 4
VC 5
VC 6
VC 7

22. Simple Mixed QoS Time-slot 1 2 3 4 5 6 7 8 VC 1 VC 2 VC 3 VC 4 VC 5

23. Deterministic Data Delivery
Time-slot 1 2 3 4 5 6 7 8
VC 1 (high priority)
VC 2 (high priority)
VC 3
VC 4
VC 5
VC 6
VC 7
Time-slot 1
Packets being transmitted
Packets being received
time

24. SpaceFibre Networks

25. SpaceFibre Routing Switch
Port 2
Port 3
SpaceFibre
Interface VC
Routing
Switch
Matrix VC
SpaceFibre
Interface VC VC
SpaceFibre
Port 2
SpaceFibre
Port 3 VC VC VC VC VC VC
Port 1
Port 4
SpaceFibre
Interface VC VC
SpaceFibre
Interface VC VC
SpaceFibre
Port 1
SpaceFibre
Port 4 VC VC VC VC VC VC
Configuration
Port

26. SpaceFibre Virtual Network
SpFi
Port 2
VC 6
SpaceFibre
Routing
Switch VC
SpFi
Port 3
Control
Processor
Instrument 1 VC
SpFi
I/F VC
VC 6
SpFi
I/F
VC 6
VC 6 VC VC VC VC VC VC VC VC VC
SpFi
Port 1 VC
VC 6
SpFi
Port 4
Instrument 2 VC
SpFi
I/F VC VC
SpFi
I/F VC
Mass
Memory
Unit
VC 6 VC VC
VC 6 VC
VC 6 VC VC VC VC
Virtual channel buffers are configured to support specific virtual channels
One set of buffers is always configured to support VC 0, the Configuration Virtual Network

27. SpaceFibre Virtual Point to Point Link
Routing
Switch VC
VC 6
VC 4
VC 2
SpFi
Port 3
Port 4
Port 2
Port 1
I/F
Control
Processor
Mass
Memory
Unit
Instrument 2
Instrument 1

28. SpaceFibre Virtual Point to Point Link
SpFi
Port 2
VC 6
SpaceFibre
Routing
Switch VC
SpFi
Port 3
Control
Processor
Instrument 1
VC 4
SpFi
I/F
VC 4
VC 6
SpFi
I/F
VC 6
VC 6 VC VC VC VC VC VC VC VC VC
SpFi
Port 1
VC 2
VC 6
SpFi
Port 4
Instrument 2
VC 2
SpFi
I/F VC
VC 4
SpFi
I/F
VC 2
Mass
Memory
Unit
VC 6 VC
VC 2
VC 6 VC
VC 6 VC
VC 4 VC VC

29. Simple SpaceFibre Network
SpFi
Port 2
VC 6
SpaceFibre
Routing
Switch VC
SpFi
Port 3
Control
Processor
Instrument 1
VC 4
SpFi
I/F
VC 4
VC 6
SpFi
I/F
VC 6
VC 6 VC VC VC VC VC VC VC VC VC
SpFi
Port 1
VC 2
VC 6
SpFi
Port 4
Instrument 2
VC 2
SpFi
I/F VC
VC 4
SpFi
I/F
VC 2
Mass
Memory
Unit
VC 6 VC
VC 2
VC 6 VC
VC 6 VC
VC 4 VC VC

30. Spacecraft Data Handling Application
SpFi
Port 2
VC 7
SpaceFibre
Routing
Switch VC
SpFi
Port 3
Control
Processor
Instrument 1
VC 1
SpFi
I/F
VC 1
VC 7
SpFi
I/F
VC 7
VC 7 VC VC VC VC VC VC VC VC VC
SpFi
Port 1
VC 2
VC 7
SpFi
Port 4
SpFi
I/F
VC 7
Mass
Memory
Unit
Instrument 2
VC 2
SpFi
I/F VC
VC 1
VC 1
VC 7 VC
VC 2
VC 2 VC
VC 7
VC 3
VC 3 VC
VC 4
VC 4
VC 5
VC 5
VC 6
VC 6
VC 8
VC 8
I 3
SpaceWire Router
VC 3
SpFi
Port 1
VC 3
VC 7
SpFi
Port 4
I 4
VC 4
SpFi
I/F
VC 4 VC
SpFi
I/F
VC 8
Downlink
Telemetry
VC 7
VC 5 VC
VC 7
I 5
VC 5
VC 6
VC 8 VC
VC 6
VC 7 VC
I 6
Instruments
SpaceWire - SpaceFibre Bridge

31. Spacecraft Data Handling Application
Control
Processor
Instrument 1
Mass
Memory
Unit
Instrument 2
I 3
I 4
Downlink
Telemetry
I 5
I 6
Instruments

32. Spacecraft Data Handling Application
SpaceFibre
Routing
Switch
Control
Processor
Instrument 1
Mass
Memory
Unit
Instrument 2
I 3
SpaceWire SpaceFibre
Bridge
I 4
Downlink
Telemetry
I 5
I 6
Instruments

33. SpaceFibre Cables and Connectors

34. SpaceFibre Physical Layer
SpaceFibre can operate over
Electrical cable up to 5 m
Fibre Optic cable at least 100 m
Electrical version uses CML
Differential
High-speed

35. SpaceFibre Test and Development

36. STAR Fire SpaceFibre unit designed by STAR-Dundee Multi-purpose
SpaceFibre interface
SpaceWire to SpaceFibre bridge
SpaceFibre packet generators/checkers
SpaceFibre link analyser

37. STAR Fire USB SpaceFibre Port 1 (8 Virtual Channels) VC/BC IF Router
Reg
USB 3
Router
SpW 1 2 5 6
SpaceFibre
Port 1
(8 Virtual Channels)
SpFi
Analyser
Mictor
Port 2 7 8
RMAP Config
(RMAP Target) 4
Configuration Bus

38. SpaceFibre Equipment

39. SpaceFibre Chips

40. SpaceFibre VHDL IP Core
Extensively tested and validated
Incorporates all capabilities
Full QoS
Fault detection, isolation and recovery
Low latency broadcast messages
Available from STAR-Dundee
Implemented in a range of FPGAs
Microsemi: AX, RTG4
Xilinx: V4, V5, Spartan 6, …
Full and “lite” versions
Full has configurable number of VCs
Lite is designed for a simple instrument interface with 2 VCs
High rate data VC
Low rate, high priority command and control VC

41. Radiation Tolerant SpaceFibre ASIC

42. RC64 Many Core DSP Processor
Ramon Chips
64 fast CEVA X1643 DSP with FP extension and HW scheduler
300 MHz
40 GFLOPS, 384 GOPS
Modem and Encrypt accelerators
4 Mbyte on-chip shared memory
Fast I/O
12x SpaceFibre,
SpaceWire
DDR3, AD/DA LVDS I/F, NVM
Rad-Hard, for space
Advanced technology
TSMC 65nm LP
CCGA / PBGA / COB
10 Watt
Modular
Payloads can employ many RC64
Versatile
Designed for all space missions
Planned for 2020—2050
Re-programmable in space
Shared Memory M
SpFi
DDR2/3
AD/DA
SpW
NVM
DMA
DSP $
scheduler
MODEM
ENCRPT

43. SpaceFibre in Radiation Tolerant FPGAs

44. SpaceFibre Lite Evaluation Board
Commercial equivalent of flight proven parts
Microsemi RTAX1000
TLK2711-SP SerDes
Pre-programmed with STAR SpFi IP core
FMC interface for connection to development boards
2.5 Gbits/s with 32-bit interface at 62.5 MHz
20% to 25% of AX1000

45. SpaceFibre on RTG4 FMC board to provide SpaceWire and SpaceFibre
RTG4 SerDes running at 2.5 Gbits/s
SpaceFibre interface 4% to 6% of RTG4 (2 to 8 VCs)
SpaceWire interface 1%, RMAP Target 2% of RTG4

46. Demonstration RTG4 Design
SpaceFibre
Interface
SpFi 4 5 6 7
SpaceFibre Interface
SpFi 4 5 6 7 1 2 3
SpW
SpaceWire

47. Demonstration STAR Fire RTG4 RTG4 Brick Mk3 Brick Mk3 Packet Generator
Packet Checker
SpaceFibre
RTG4
SpaceFibre
SpW
RTG4
SpaceFibre
SpW
Brick Mk3
SpW
USB 3.0
Brick Mk3
SpW
USB 3.0
Command
Window
Command
Window

49. Conclusions
SpaceFibre designed specifically for spaceflight applications
Integrated QoS
Integrated FDIR capabilities
Galvanic isolation
Compatible with SpaceWire packet level
Efficient design giving very small footprint
Benefits
Very high performance
Reduced harness mass
Interoperability with existing SpaceWire devices
Simplification of redundancy
Deterministic data delivery for control applications
Single integrated network
Running on RTAX and RTG4 now

50. Thank You Any questions?
Demonstration in Exhibition/Coffee area