24th SpaceWire Working Group Meeting

22 Sept 2015, 14:00 → 24 Sept 2015, 18:00 Europe/Amsterdam

Einstein (ESA/ESTEC)

David Jameux (ESA), Martin Suess

Dear SpaceWire Technology Developers and Users,

The 24th  SpaceWire Working Group Meeting will take place from Tuesday 22nd of September PM to Thursday 24th of September AM 2015 at ESTEC, Noordwijk followed by the SpW WG Steering Committe meeting on Thursday 24th of September PM.

• System and Mission Requirements and Lessons Learned
• SpW Simulation, Test, and Verification
• SpW Component Developments
• SpaceWire Backplane
• SpaceWire Network Management
• Deterministic SpW
• SpaceFibre
• SpW2
• SpaceWire Conference
• Other topics

Supporting Documents

• Draft_SpW-FDIR_v1.1.pdf
• SpaceFibre ECSS Draft H1 v14
• SpaceWire-D_Standard_Draft_D_v0.15.pdf
• SpaceWire-R specification Iss0.4
• SpaceWire_Standard_DFR_(draft_v1.8).pdf
• SpaceWire_Standard_DFR_(draft_v2.0).pdf

Tuesday 22 September

Meeting opening

Conveners: Mr David Jameux (ESA/ESTEC), Mr Martin Suess (ESA/ESTEC)

SpW Evolutions I: ECSS-ST-E-50-12C

This session will be dedicated to the revision of the current SpaceWire standard in support to the work of the ECSS Working Group as well as to inputs into further evolution of ECSS-ST-E-50-12C.

Convener: Mr David Jameux (ESA/ESTEC)

1 ECSS-E-ST-50-12C-Rev1 status

Speaker: Mr David Jameux (ESA/ESTEC)

Slides Status of the SpW standard revision process

2 "Assignment of Pin 3 in SpaceWire Unit Connectors"

Speaker: Mr Martin Suess (ESA/ESTEC)

Slides Assignment of Pin 3 in SpaceWire Unit Connectors

3 Recommended SpaceWire Standard Quality of Service Improvement (while maintaining backward compatibility)

Discusses problems with SpaceWire Quality of Service and an alternative option other than SpaceWire-D to solve the problem without drastic changes to the SpaceWire design. This alternative solution allows existing SpaceWire nodes to remain unchanged with only changes to SpaceWire switches.

Speaker: Mr Glenn Rakow (NASA/GSFC)

Slides Recommended SpaceWire Standard QoS Improvement

15:45 Coffee break

SpW Simulation, Test, and Verification

This session will be dedicated to the test, verification and simulation tools and requirements.

Convener: Prof. Yuriy SHEYNIN (St. Petersburg University of Airospace Instrumentation)

4 Synchronization, Trigger and Decode of a SpaceWire data stream with an Oscilloscope

This presentation shows the most recent aspects how to synchronize on very long and continuous SpaceWire data streams without gaps and synchronization patterns. In addition, the presentation shows how to trigger and decode a SpaceWire data stream with an oscilloscope.

Speaker: Mr Matthias Beer (Rohde&Schwarz GmbH & Co KG)

Slides 24#_SpQ_WG_Meeting_-_SpaceWire_Synchronization_and_Decoding_-_20150922.pdf

5 SpaceWire Satellite Development Systems

4Links will introduce the concept of SpaceWire Satellite Development Systems, together with brief descriptions of the first products. These will include the basic elements needed to build a model of the SpaceWire network on a proposed satellite: a single-board computer, a routing switch, and a bridge from SpaceWire to Ethernet to represent a link to the ground. They will also include a remote monitor that can be used in the final stages satellite assembly, integration and test (AIT) to resolve interaction problems between the subsystems about to be launched.

Speaker: Mr Paul Walker (4Links Limited)

Slides Modular Satellite Development Systems

Wednesday 23 September

SpW for Cmd&Ctrl

This session will be dedicated to all SpW-based protocols that may support PUS or other kinds of Command & Control on board spacecraft.

Conveners: Mr Christophe HONVAULT (ESA), Mr Marco Rovatti (ESA-ESTEC)

6 Performance evaluation of SpaceWire-R IP Core and updates of the specification

NEC and JAXA performed evaluation of SpaceWire-R IP Core (in VHDL) as a part of JAXA Standardization activities in Japanese fiscal year 2014 (April 2014 - March 2015). Results of the performance evaluation project will be presented including packet transmission latency and throughput for various payload lengths, segmentation size, and the number of concurrently opened communication channels. Since the protocol specification has been slightly updated to remove complexity in the last few months, we will also describe changes made to the specification.

Speaker: Dr Takayuki Yuasa (RIKEN)

Slides SpaceWire-R IP core implementation and performance study

7 SpaceWire-D

The different services provided by SpaceWire-D will be described. Initial results of tests run on an experimental implementation of SpaceWire-D will be presented.

Speaker: Mr David Gibson (University of Dundee)

Slides SpaceWire-D

10:50 Coffee break

SpW for Cmd&Ctrl: Continued

This session will be dedicated to all SpW-based protocols that may support PUS or other kinds of Command & Control on board spacecraft.

Conveners: Mr Christophe HONVAULT (ESA), Mr Marco Rovatti (ESA-ESTEC)

8 Deterministic network services in SpaceWire/SpaceFibre networks

Presentation on determinism in SpW\SpFi networks, different types of determinism

Speaker: Mr Valentin Olenev (St. Petersburg State University of Aerospace Instrumentation)

Slides Deterministic network services in SpaceWire or SpaceFibre networks

9 SpaceWire-R implementation and test considerations

The SpaceWire-R protocol, the specification of which has recently been updated, is the subject of a study in the Space-R project. In the presentation the testing objectives and scenarios adopted in the project are shown and related to the protocol specification.

Speaker: Mr Krzysztof Romanowski (ITTI)

Slides SpaceWire-R implementation and test considerations

12:05 Lunch break

SpW Network Management

This session will be dedicated to SpaceWire network management features and protocols such as network discovery and configuration, Electronic Data Sheets, FDIR, and SpaceWire related protocol stacks.

Convener: Mr Glenn Rakow (NASA/GSFC)

10 Layering protocols over SpaceWire

The SpaceWire protocol stack clearly specifies protocols layering from the Physical up to the Network layer. Layers over the basic SpaceWire protocol stack with a variety of Transport layer protocols, scheduling and FDIR services, connection with the Application layer do not have consistent specification. The problem of layering higher layer protocols over SpaceWire is considered.

Speaker: Prof. Yuriy SHEYNIN (St. Petersburg University of Airospace Instrumentation)

Slides Layering protocols over SpaceWire

11 SpaceWire network discovery scenarios in the SPACEMAN project

A number of SpaceWire network discovery scenarios have been studied in the SPACEMAN project. In the presentation the main functionalities of the SPACEMAN network management tool are introduced, then examples of network topologies are shown, both acyclic and cyclic (with cycles or loops). The algorithms used for determining the identity of the devices and discovering the network are discussed, including cases of multiple coordinated as well as non-coordinated control devices.

Speaker: Mr Krzysztof Romanowski (ITTI)

Slides SpW network discovery scenarios in the SPACEMAN project

15:30 Coffee break

SpW Evolutions II: SpaceFibre

This session will be dedicated to the development of the SpaceFibre protocol.

Convener: Mr Martin Suess (ESA/ESTEC)

12 SpaceFibre ECSS Standard

The SpaceFibre standard has now started the formal ECSS approval process with a working group set up to refine the current standard specification. This presentation will outline the current state of the SpaceFibre standard.

Speaker: Prof. Steve Parkes (University of Dundee)

Slides SpaceFibre

13 SpaceFibre Virtual Channels Throughput Estimation in Case of Transient Faults

The SpaceFibre QoS defines VC Bandwidth Credit and the VC Available Bandwidth is measured for SpaceFibre links. We consider Available Bandwidth calculation rules in case of transient faults and frames retransmission and propose clarification for the SpaceFibre specification draft.

Speaker: Prof. Yuriy Sheynin (SUAI)

Slides SpaceFibre Virtual Channels Throughput Estimation in Case of Transient Faults

Diner

Thursday 24 September

SpW- and SpFi-related components

This session will be dedicated to SpaceWire-related components: SpW End-Points (network interfaces), SpW Switches, System-on-chips, boards, units, etc.

Convener: Mr Giorgio Magistrati (ESA/Data Systems Division)

14 SpaceFibre on Microsemi RTG4 FPGA

STAR-Dundee Ltd working in close collaboration with Microsemi hasimplemented both SpaceWire and SpaceFibre on the new RTG4 FPGA. This demonstration will show SpaceFibre running at 2.5 Gbits/s between two RTG4 devices and to other equipment. It will also demonstrate SpaceWire running over SpaceFibre.

Speakers: Mr Albert Ferrer (Star Dundee), Dr Alberto Gonzalez Villafranca (STAR-Dundee Ltd), Prof. Steve Parkes (University of Dundee)

Slides SpaceFibre on RTG4

15 Independent implementation of the GigaSpace Wire codec on FPGA

Independent development implementation of IP-cores- Codec Giga Space Wire on the basis of the standard’s draft SpaceWire-ENG Health check of the project at the lab bench Interoperability test with other implementations of Giga Space Wire (to be fullfilled)

Speaker: Mr Grishin Viacheslav (Scientific Research Institute "Submicron")

Slides Independent implementation of the GigaSpaceWire Codec on FPGA

16 Development of a Space Grade CPU

Speaker: Prof. Seisuke Fukuda (JAXA)

10:05 Coffee break

SpW Evolutions III: SPW2

Convener: Mr David Jameux (ESA/ESTEC)

17 SpaceWire2: System issues

Speaker: Mr Paul Walker (4Links Limited)

Slides SpaceWire2 - System issues

SpW- and SpFi-related components: Continued

This session will be dedicated to SpaceWire-related components: SpW End-Points (network interfaces), SpW Switches, System-on-chips, boards, units, etc.

Convener: Mr Giorgio Magistrati (ESA/Data Systems Division)

18 SpaceWire Matched Impedance Connector

I. INTRODUCTION Under the ESA Technology Research Program (TRP), contract n° AO/1-7985/14/NLSW, Axon’ Cable is working as a prime on the development of a compact impedance matched connector for SpaceWire links in partnership with Star-Dundee. Connectors as per ESCC 3401/071 asked by ECSS-E-ST-50-12C are not ESCC qualified and do not offer optimal inner shield termination compatible with SpaceWire cables (ground continuity, EMC, etc.). Indeed, micro-D connectors used in current design drive the performances of the SpaceWire Cable Assemblies. This new study is the logical next step following the development of Low Mass SpaceWire Cable which is now referenced by ESA specification (ESCC3902.004) and will lead to its ESA qualification approval imminently. II. MAIN OBJECTIVES The aim of this 2-year project is to develop a new connector with matched impedance SpaceWire links (100 Ohms characteristic differential impedance) to create a very high performance connection for the space environment. This project will call for a trade-off on the link with regards to the electrical and physical characteristics such as for instance EMI and crosstalk performances, 360° shield termination for inner and outer shields; adapted to existing SpW cables (4 STP), compact, dismountable and a minimum of 400Mbit/s. Axon’ has already started with: • A technical survey (still under review with ESA) like consulting SpaceWire users to check their needs for this product and potential candidates among existing connectors on the market. • A preliminary design of the connector and cable in parallel These activities will be followed by an advanced and final design, evaluation tests still to be defined, writing of a PID for the link and an audit by ESA. III. CONNECTOR DESIGN In order to reach the electrical requirements the connector will have one cavity with inner shield continuity for each pair of signal and the outer shield continuity with a dedicated backshell. Axon’ is using CST for microwaves finite element simulations. This tool helps us to design the entire connector with TDR, s parameter and eye pattern diagram results. Per Axon’ experience and to avoid contacts misalignment during mating, we are also working on a new guide pin solution. It will be fully integrated in the shells of the connectors without any additionnal component. This new range of connectors will include in-line and panel mount configurations. A solution without backshell for 4 Shielded Twisted Pair cable without outer shield is also considered for potential other applications. IV. PCB CONNECTION SOLUTION Complementary to a rigid surface mount connection Axon’ is studying a flexible solution by using a PCB flex as a media connection. This PCB is made up with polyimide insulation which will be impedance adapted. This component will be terminated with 2 rigid parts for the connection to the PCB and the shell of the connector. This design offers matched impedance along the line with a complete ground plane on the back of the flex. This compact connection is still in discussion with our sub-contractor for manufacturing process and surface finishes. V. CABLE SURVEY Axon’ has launched an internal cable survey to analyze and compare cable types. The aim is to highlight advantages and drawbacks of each cable configuration and establish the most appropriate cable for SpaceWire links. The standard SpaceWire cable and low mass variant are of course taken into account but also four parallel shielded parallel pair, shielded twin quad and a new intern development for a parallel pair mono-core. Axon’ is currently carrying out studies for each of these configurations and is manufacturing samples which will be tested before the end of the year. Depending on the study results another ESA project dedicated to the cable could be considered but the cable evaluation is not part of this contract as agreed with ESA. VI. CONCLUSIONS The project is still at an early stage with on-going surveys and preliminary design. An important outcome of this project in approximately two years should be a draft by Axon’ of an ESCC specification for the link plus an ESCC PCB detail specification characterizing the new SpaceWire which could be innovative with a unique specification for a harness.

Speakers: Mr Florent Mettendorff (Axon' Cable Ltd), Mr Kevin Enouf (Axon' Cable SAS (Axo.com)), Mr Stephane Hermant (Axon' Cable SAS (Axo.com))

Slides SpaceWire 100Ohm connector

SpW Conferences and events

This session will be dedicated to the announcement of SpaceWire-related events in general and to the International SpaceWire Conference in 2016 in particular.

Convener: Mr Martin Suess (ESA/ESTEC)

19 7th International SpaceWire Conference

Speaker: Prof. Masaharu Nomachi (Osaka University)

Slides 7th International SpaceWire Conference.pdf

Meeting close-out

Convener: Mr David Jameux (ESA/ESTEC)

slides Meeting Close-out

Steering Committee meeting

Convener: Mr Martin Suess (ESA/ESTEC)