SIST EN 16603-50-12:2020

Space engineering - SpaceWire - Links, nodes, routers and networks

This Standard specifies the physical interconnection media and data communication protocols to enable the reliable sending of data at high­speed (between 2 Mb/s and 400 Mb/s) from one unit to another. SpaceWire links are full­duplex, point­to­point, serial data communication links.
The scope of this Standard is the physical connectors and cables, electrical properties, and logical protocols that comprise the SpaceWire data link. SpaceWire provides a means of sending packets of information from a source node to a specified destination node. SpaceWire does not specify the contents of the packets of information.
This Standard covers the following protocol levels:
•   Physical level: Defines connectors, cables, cable assemblies and printed circuit board tracks.
•   Signal level: Defines signal encoding, voltage levels, noise margins, and data signalling rates.
•   Character level: Defines the data and control characters used to manage the flow of data across a link.
•   Exchange level: Defines the protocol for link initialization, flow control, link error detection and link error recovery.
•   Packet level: Defines how data for transmission over a SpaceWire link is split up into packets.
•   Network level: Defines the structure of a SpaceWire network and the way in which packets are transferred from a source node to a destination node across a network. It also defines how link errors and network level errors are handled.
This Standard may be tailored for the specific characteristics and constraints of a space project in conformance with ECSS-S-ST-00.

Raumfahrttechnik - SpaceWire - Verbindungen, Knoten, Router und Netzwerke

Ingénierie spatiale - SpaceWire - Liens, nœuds, routeurs et réseaux

La technologie SpaceWire s'est développée à partir des besoins des applications de
traitement des données embarquées sur les engins spatiaux. La présente norme fournit
une base formelle pour l'exploitation de SpaceWire dans une large gamme de futurs
systèmes de traitement embarqués.
L'un des principaux objectifs de SpaceWire est d'assurer la compatibilité et la
réutilisation des équipements au niveau des composants et des sous-systèmes. En
principe, un système de traitement des données développé pour un instrument optique,
par exemple, peut servir à un instrument radar en débranchant le capteur optique et en
branchant celui du radar. Les unités de traitement, les unités de mémoire de masse et les
systèmes de télémétrie sur liaison descendante mis au point pour une mission peuvent
être facilement utilisés dans le cadre d'une autre mission, ce qui réduit le coût du
développement, améliore la fiabilité et, surtout, augmente le volume de travail
scientifique qui peut être réalisé avec un budget limité.
L'intégration et le test de systèmes embarqués complexes sont également pris en charge
par SpaceWire avec des équipements de support au sol se branchant directement sur le
système de traitement des données embarqué. La surveillance et les tests peuvent être
effectués grâce à une interface transparente avec le système embarqué.
SpaceWire est le résultat des efforts conjugués de nombreuses personnes au sein de
l'Agence Spatiale Européenne, de l'industrie spatiale européenne et du monde
universitaire.
La présente norme peut être adaptée aux caractéristiques et contraintes spécifiques d'un
projet spatial, conformément à l'ECSS-S-ST-00.

Vesoljska tehnika - SpaceWire - Povezave, vozlišča, usmerjevalniki in omrežja

General Information

• Status: Published
• Public Enquiry End Date: 27-Nov-2019
• Publication Date: 01-Apr-2020
• ICS: 49.140 - Space systems and operations
• Technical Committee: I13 - Imaginarni 13
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 30-Mar-2020
• Due Date: 04-Jun-2020
• Completion Date: 02-Apr-2020
• Mandate: M/496 - Mandate addressed to CEN, CENELEC and ETSI to develop standardisation regarding space industry (Phase 3 of the process)
• Ref Project: EN 16603-50-12:2020 - Space engineering - SpaceWire - Links, nodes, routers and networks

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 16603-50-12:2020
01-junij-2020
Vesoljska tehnika - SpaceWire - Povezave, vozlišča, usmerjevalniki in omrežja
Space engineering - SpaceWire - Links, nodes, routers and networks
Raumfahrttechnik - SpaceWire - Verbindungen, Knoten, Router und Netzwerke
Ingénierie spatiale - SpaceWire - Liens, nœuds, routeurs et réseaux
Ta slovenski standard je istoveten z: EN 16603-50-12:2020
ICS:
49.140 Vesoljski sistemi in operacije Space systems and
operations
SIST EN 16603-50-12:2020 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 16603-50-12:2020

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SIST EN 16603-50-12:2020


EUROPEAN STANDARD
EN 16603-50-12

NORME EUROPÉENNE

EUROPÄISCHE NORM
March 2020
ICS 49.140

English version

Space engineering - SpaceWire - Links, nodes, routers and
networks
Ingénierie spatiale - SpaceWire - Liaisons, noeuds, Raumfahrttechnik - SpaceWire - Verbindungen,
routeurs et réseaux Knoten, Router und Netzwerke
This European Standard was approved by CEN on 29 December 2019.

CEN and CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for
giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical
references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to
any CEN and CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN and CENELEC member into its own language and notified to the CEN-CENELEC
Management Centre has the same status as the official versions.

CEN and CENELEC members are the national standards bodies and national electrotechnical committees of Austria, Belgium,
Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy,
Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia,
Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.






















CEN-CENELEC Management Centre:
Rue de la Science 23, B-1040 Brussels
© 2020 CEN/CENELEC All rights of exploitation in any form and by any means Ref. No. EN 16603-50-12:2020 E
reserved worldwide for CEN national Members and for
CENELEC Members.

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SIST EN 16603-50-12:2020
EN 16603-50-12:2020 (E)
Table of contents
European Foreword . 7
1 Scope . 8
2 Normative references . 9
3 Terms, definitions and abbreviated terms . 10
3.1 Terms from other standards . 10
3.2 Terms specific to the present standard . 10
3.3 Abbreviated terms. 20
3.4 Conventions. 21
3.4.1 Numbers . 21
3.4.2 Differential signals . 21
3.4.3 Order of sending bits in symbols . 21
3.4.4 Graphical representation of packets . 22
3.4.5 State diagram notation . 22
3.4.6 UML diagram notation . 23
3.5 Nomenclature . 24
4 Overview of SpaceWire . 25
4.1 Introduction . 25
4.2 SpaceWire Spacecraft Data-Handling Network . 25
4.2.1 The Rationale for SpaceWire . 25
4.2.2 Example SpaceWire Application . 26
4.2.3 How SpaceWire Works . 28
5 Requirements . 33
5.1 Overview . 33
5.2 Protocol stack and interface architecture . 33
5.2.1 Protocol stack . 33
5.2.2 Network layer . 34
5.2.3 Data Link layer . 34
5.2.4 Encoding layer . 35
5.2.5 Physical layer . 35
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5.2.6 Management Information Base . 36
5.2.7 Service interfaces . 36
5.2.8 SpaceWire Port architecture . 36
5.3 Physical layer . 37
5.3.1 Introduction . 37
5.3.2 Cables . 38
5.3.3 Connectors . 41
5.3.4 Cable assemblies . 45
5.3.5 PCB tracks . 50
5.3.6 Line drivers and receivers . 51
5.3.7 Data-Strobe skew . 59
5.3.8 Physical layer management parameters . 62
5.4 Encoding layer . 63
5.4.1 Introduction . 63
5.4.2 Serialisation and de-serialisation . 63
5.4.3 Character and control code encoding . 63
5.4.4 Data strobe encoding and decoding . 66
5.4.5 First Null . 68
5.4.6 Null detection . 68
5.4.7 Parity error . 69
5.4.8 Disconnect . 69
5.4.9 ESC error . 69
5.4.10 Data signalling rate . 70
5.4.11 Encoding layer management parameters . 71
5.5 Data link layer . 71
5.5.1 Introduction . 71
5.5.2 Data link layer interfaces . 71
5.5.3 Data link layer management interface . 72
5.5.4 Flow control. 73
5.5.5 Flow control errors . 74
5.5.6 Sending priority . 75
5.5.7 Link initialisation behaviour . 75
5.5.8 Link error recovery . 80
5.5.9 Accepting broadcast codes for sending . 82
5.6 SpaceWire network layer . 82
5.6.1 Introduction . 82
5.6.2 SpaceWire packets . 83
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5.6.3 Broadcast codes . 83
5.6.4 SpaceWire time-codes . 84
5.6.5 SpaceWire distributed interrupts . 87
5.6.6 SpaceWire nodes . 94
5.6.7 SpaceWire node management parameters . 96
5.6.8 SpaceWire routing. 96
5.6.9 SpaceWire routing switch management parameters . 104
5.6.10 SpaceWire network . 104
5.7 SpaceWire management information base . 106
5.7.1 Introduction . 106
5.7.2 General . 106
5.7.3 Physical layer management parameters . 106
5.7.4 Encoding layer management parameters . 106
5.7.5 Data link layer management parameters . 106
5.7.6 Network layer management parameters . 106
6 Service interfaces . 107
6.1 Network layer service interface . 107
6.1.1 Packet service interface . 107
6.1.2 Time-code service interface . 108
6.1.3 Distributed interrupt service interface . 109
6.2 Data link layer service interface . 111
6.2.1 N-Char service interface. 111
6.2.2 Broadcast code service interface . 113
6.3 Encoding layer service interface . 114
6.3.1 Encoding service interface . 114
6.3.2 Decoding service interface . 115
6.4 Physical layer service interface . 117
6.4.1 Line transmit service interface . 117
6.4.2 Line receive service interface . 118
6.5 Management information base service interface . 119
6.5.1 Set parameter service interface. 119
6.5.2 Get parameter service interface . 119
Annex A (informative) Technical Changes . 121
Bibliography . 123

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Figures
Figure 3-1: Convention for first bit to be sent . 21
Figure 3-2: Graphical packet notation . 22
Figure 3-3: State diagram style . 22
Figure 3-4: UML notation . 23
Figure 4-1: Example SpaceWire Architecture without redundancy . 27
Figure 4-2: SpaceWire Packet Format . 29
Figure 4-3: Path Addressing . 31
Figure 4-4 Logical Addressing . 32
Figure 5-1: SpaceWire protocol stack . 34
Figure 5-2: SpaceWire port architecture . 37
Figure 5-3: SpaceWire connector contact identification . 44
Figure 5-4: SpaceWire cable assembly Type A . 47
Figure 5-5: SpaceWire cable assembly Type AL . 49
Figure 5-6: SpaceWire LVDS . 53
Figure 5-7: LVDS line driver output signals. 54
Figure 5-8: LVDS line driver differential output signal . 56
Figure 5-9: Physical layer components . 59
Figure 5-10: Skew and jitter . 62
Figure 5-11: Data character encoding . 64
Figure 5-12: Control character encoding . 65
Figure 5-13: Null control code encoding . 65
Figure 5-14: Broadcast code encoding . 66
Figure 5-15: Parity coverage . 66
Figure 5-16: Data-Strobe (DS) encoding . 67
Figure 5-17: Data and strobe signals for first Null . 68
Figure 5-18: Null detection sequence . 69
Figure 5-19: Link initialisation behaviour . 76
Figure 5-20: Link error recovery behaviour . 81
Figure 5-21: SpaceWire packet format . 83
Figure 5-22: Specialisations and relationships of a SpaceWire broadcast code . 84
Figure 5-23 Network layer time-code . 85
Figure 5-24: Network layer interrupt . 88
Figure 5-25: Network layer interrupt acknowledgement code . 89
Figure 5-26: Components and specialisations of a SpaceWire node . 95
Figure 5-27: Components of a SpaceWire routing switch . 97
Figure 5-28: Components of a SpaceWire network . 105
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Tables
Table 5-1: Constants for a SpW cable using 28 AWG differential pairs . 39
Table 5-2: Insertion loss values 28AWG SpW cable . 40
Table 5-3: Constants for a SpaceWire cable using 26 AWG differential pairs . 40
Table 5-4: Insertion loss values for 26 AWG SpaceWire cable . 40
Table 5-5: Cable PSNEXT specification . 41
Table 5-6: Cable PSELFEXT specification . 41
Table 5-7: Connector contact identification . 43
Table 5-8: Cable assembly Type A signal wire connections . 47
Table 5-9: Cable assembly Type AL signal wire connections . 49
Table 5-10 Example calculation of maximum bit rate . 61
Table 5-11: Address function . 99


6

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SIST EN 16603-50-12:2020
EN 16603-50-12:2020 (E)
European Foreword
This document (EN 16603-50-12:2020) has been prepared by Technical
Committee CEN-CENELEC/TC 5 “Space”, the secretariat of which is held by
DIN.
This standard (EN 16603-50-12:2020) originates from ECSS-E-ST-50-12C Rev.1.
This European Standard shall be given the status of a national standard, either
by publication of an identical text or by endorsement, at the latest by September
2020, and conflicting national standards shall be withdrawn at the latest by
September 2020.
Attention is drawn to the possibility that some of the elements of this document
may be the subject of patent rights. CEN [and/or CENELEC] shall not be held
responsible for identifying any or all such patent rights.
This document has been prepared under a standardization request given to
CEN by the European Commission and the European Free Trade Association.
This document has been developed to cover specifically space systems and has
therefore precedence over any EN covering the same scope but with a wider
domain of applicability (e.g. : aerospace).
According to the CEN-CENELEC Internal Regulations, the national standards
organizations of the following countries are bound to implement this European
Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic,
Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia,
Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United
Kingdom.
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1
Scope
SpaceWire technology has grown from the needs of spacecraft on-board data
handling applications. This Standard provides a formal basis for the
exploitation of SpaceWire in a wide range of future on-board processing
systems.
One of the principal aims of SpaceWire is the support of equipment
compatibility and reuse at both the component and subsystem levels. In
principle a data-handling system developed for an optical instrument, for
example, can be used for a radar instrument by unplugging the optical sensor
and plugging in the radar one. Processing units, mass-memory units and down-
link telemetry systems developed for one mission can be readily used on
another mission, reducing the cost of development, improving reliability and
most importantly increasing the amount of scientific work that can be achieved
within a limited budget.
Integration and test of complex on-board systems is also supported by
SpaceWire with ground support equipment plugging directly into the on-board
data-handling system. Monitoring and testing can be carried out with a
seamless interface into the on-board system.
SpaceWire is the result of the efforts of many individuals within the European
Space Agency, European Space Industry and academia.
This standard may be tailored for the specific characteristics and constraints of a
space project in conformance with ECSS-S-ST-00.
8

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2
Normative references
The following normative documents contain provisions which, through
reference in this text, constitute provisions of this ECSS Standard. For dated
references, subsequent amendments to, or revision of any of these publications
do not apply. However, parties to agreements based on this ECSS Standard are
encouraged to investigate the possibility of applying the more recent editions of
the normative documents indicated below. For undated references, the latest
edition of the publication referred to applies.
EN reference Reference in text Title
EN 16601-00-01 ECSS-S-ST-00-01 ECSS system - Glossary of terms
EN 16602-70-08 ECSS-Q-ST-70-08 Space product assurance - Manual soldering of high-
reliability electrical connections
EN 16602-70-26 ECSS-Q-ST-70-26 Space product assurance - Crimping of high-reliability
electrical connections
ESCC 3401 Connectors, electrical, non-filtered circular and
rectangular, ESCC Generic Specification no. 3401,
Issue 5, March 2018
ESCC 3401/029:2017 Connectors, Electrical, Rectangular, Microminiature,
based on type MDMA, ECSS Detail Specification no.
3401/029, Issue 15, November 2017.
ESCC 3401/077:2016 Connectors, Electrical, Rectangular, Microminiature,
Removable Crimp Contacts, based on type MDMA,
ECSS Detail Specification no. 3401/077, Issue 7, April
2016.
ESCC 3902/003:2014 Cable, “SpaceWire”, Round, Quad using Symmetric
Cables, Flexible, –200 to +180 °C, Detail Specification
no. 3902/003, Issue 4, November 2014.
ESCC 3902/004:2014 Cable, Low Mass, “SpaceWire”, Round, Quad using
Symmetric Cables, Flexible, –100 to +150 °C, Detail
Specification no. 3902/004, Issue 1, October 2014.
MIL-DTL-17J:2014 Military Specification: Cables, Radio, Frequency,
th
Flexible and Semirigid, General Specification for, 10
February 2014.
TIA-644-A:2012 TIA-644-A, Electrical Characteristics of Low Voltage
Differential Signalling (LVDS) Interface Circuits,
Revision A, Reaffirmed 12/07/12, Telecommunications
Industry Association, 2012.
9

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3
Terms, definitions and abbreviated terms
3.1 Terms from other standards
For the purpose of this Standard, the terms and definitions from ECSS-S-ST-00-01
apply.
3.2 Terms specific to the present standard
The UML diagrams of Figure 5-22, Figure 5-26, Figure 5-27 and Figure 5-28 in
clause 5.6 illustrate the relationships between various terms used within this
standard.
3.2.1 allocated output port
output port that a packet is routed through
3.2.2 after 6,4 μs
delay of 6,4 μs (nominal) measured from when a state is entered
3.2.3 after 12,8 μs
delay of 12,8 μs (nominal) measured from when a state is entered
3.2.4 AutoStart
management parameter set by hardware or software which when asserted
allows an enabled SpaceWire port to start the SpaceWire link only when a Null
is received
3.2.5 bit error rate
ratio of the number of bits received in error to the total number of bits sent
across a link
3.2.6 broadcast code
time-code or distributed interrupt code
3.2.7 broadcast code identifier
two-bit code that identifies the type of broadcast code: 0b00 identifies a time-
code and 0b10 identifies a distributed interrupt code
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3.2.8 byte
eight bits
3.2.9 cargo
some information for transfer from a source to a destination which is
encapsulated in a packet
3.2.10 character
control character or data character
3.2.11 coding
act of translating a set of bits into another set of bits which are more appropriate
for transmitting across a medium
3.2.12 configuration port
port in a routing switch or node that gives access to a configuration node
3.2.13 configuration node
type of node whose purpose is to configure the routing switch or node that it is
part of
3.2.14 control character
ESC, FCT, EOP or EEP character that is used to pass control information across
a link
3.2.15 control code
sequence of an ESC followed by an FCT forming a Null which is used to keep a
link active, or a sequence of an ESC character followed by a data character
forming a broadcast code which is used to broadcast time-codes and
distributed interrupt codes over a SpaceWire network
3.2.16 control symbol
control character encoded in 4-bits for transfer across a link
3.2.17 data character
character that is used to pass 8 bits of data across a link
3.2.18 data link layer
protocol layer which is responsible for the initialisation of a SpaceWire link, for
transferring packets and broadcast codes over the link and for recovery from
errors on the link
3.2.19 data rate
rate at which the application data is transferred across a link
3.2.20 data signalling rate
rate at which the bits constituting control and data symbols are transferred
across a link
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3.2.21 data-strobe
sequence of data bits and bit clock encoded into two signals, one containing the
data bit sequence (data) and the other changing state whenever the data bit
sequence does not (strobe)
3.2.22 data symbol
data character encoded in 10 bits for transfer across a link
3.2.23 decoding
act of translating an encoded set of bits back into the original set of bits prior to
encoding
3.2.24 de-serialisation
transformation of a serial bit stream into a sequence of control or data symbols
3.2.25 destination
end-point that a packet is being sent to
3.2.26 destination address
route, described by a path address, to be taken by a packet in moving from
source to destination or an identifier, in the form of a logical address,
specifying the destination
3.2.27 destination node
node that is the destination of one or more SpaceWire packets
3.2.28 disconnect
indication from a receiver that there has been no edge on the data or strobe
signals for the past 850 ns (nominal) indicating that the link is disconnected
3.2.29 distributed interrupt
interrupt that is distributed to all or many nodes on the network
3.2.30 distributed interrupt code
broadcast code used to distribute interrupts over a SpaceWire network which
is either an interrupt code or an interrupt acknowledgement code
3.2.31 driver
electronic circuit that tra
...

SLOVENSKI STANDARD
kSIST FprEN 16603-50-12:2019
01-november-2019
Vesoljska tehnika - SpaceWire - Povezave, vozlišča, usmerjevalniki in omrežja
Space engineering - SpaceWire - Links, nodes, routers and networks
Raumfahrttechnik - SpaceWire - Verbindungen, Knoten, Router und Netzwerke
Ingénierie spatiale - SpaceWire - Liens, nœuds, routeurs et réseaux
Ta slovenski standard je istoveten z: FprEN 16603-50-12
ICS:
49.140 Vesoljski sistemi in operacije Space systems and
operations
kSIST FprEN 16603-50-12:2019 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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kSIST FprEN 16603-50-12:2019


EUROPEAN STANDARD
FINAL DRAFT
FprEN 16603-50-12
NORME EUROPÉENNE

EUROPÄISCHE NORM

September 2019
ICS 49.140

English version

Space engineering - SpaceWire - Links, nodes, routers and
networks
Ingénierie spatiale - SpaceWire - Liens, nœuds, Raumfahrttechnik - SpaceWire - Verbindungen,
routeurs et réseaux Knoten, Router und Netzwerke
This draft European Standard is submitted to CEN members for unique acceptance procedure. It has been drawn up by the
Technical Committee CEN/CLC/JTC 5.

If this draft becomes a European Standard, CEN and CENELEC members are bound to comply with the CEN/CENELEC Internal
Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any
alteration.

This draft European Standard was established by CEN and CENELEC in three official versions (English, French, German). A
version in any other language made by translation under the responsibility of a CEN and CENELEC member into its own
language and notified to the CEN-CENELEC Management Centre has the same status as the official versions.

CEN and CENELEC members are the national standards bodies and national electrotechnical committees of Austria, Belgium,
Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy,
Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia,
Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.















CEN-CENELEC Management Centre:
Rue de la Science 23, B-1040 Brussels
© 2019 CEN/CENELEC All rights of exploitation in any form and by any means Ref. No. FprEN 16603-50-12:2019 E
reserved worldwide for CEN national Members and for
CENELEC Members.

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kSIST FprEN 16603-50-12:2019
FprEN 16603-50-21:2019 (E)
Table of contents
European Foreword . 7
1 Scope . 8
2 Normative references . 9
3 Terms, definitions and abbreviated terms . 10
3.1 Terms from other standards . 10
3.2 Terms specific to the present standard . 10
3.3 Abbreviated terms. 20
3.4 Conventions. 21
3.4.1 Numbers . 21
3.4.2 Differential signals . 21
3.4.3 Order of sending bits in symbols . 21
3.4.4 Graphical representation of packets . 22
3.4.5 State diagram notation . 22
3.4.6 UML diagram notation . 23
3.5 Nomenclature . 24
4 Overview of SpaceWire . 25
4.1 Introduction . 25
4.2 SpaceWire Spacecraft Data-Handling Network . 25
4.2.1 The Rationale for SpaceWire . 25
4.2.2 Example SpaceWire Application . 26
4.2.3 How SpaceWire Works . 28
5 Requirements . 33
5.1 Overview . 33
5.2 Protocol stack and interface architecture . 33
5.2.1 Protocol stack . 33
5.2.2 Network layer . 34
5.2.3 Data Link layer . 34
Document type:  European Standard
Document subtype:
Document stage:  UAP
Document language:  E

Y:\STD_MGT\STDDEL\PRODUCTION\Standards\JT005\117\51_e_stf.docx

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FprEN 16603-50-12:2019 (E)
5.2.4 Encoding layer . 35
5.2.5 Physical layer . 35
5.2.6 Management Information Base . 36
5.2.7 Service interfaces . 36
5.2.8 SpaceWire Port architecture . 36
5.3 Physical layer . 37
5.3.1 Introduction . 37
5.3.2 Cables . 38
5.3.3 Connectors . 41
5.3.4 Cable assemblies . 45
5.3.5 PCB tracks . 50
5.3.6 Line drivers and receivers . 51
5.3.7 Data-Strobe skew . 59
5.3.8 Physical layer management parameters . 62
5.4 Encoding layer . 63
5.4.1 Introduction . 63
5.4.2 Serialisation and de-serialisation . 63
5.4.3 Character and control code encoding . 63
5.4.4 Data strobe encoding and decoding . 66
5.4.5 First Null . 68
5.4.6 Null detection . 68
5.4.7 Parity error . 69
5.4.8 Disconnect . 69
5.4.9 ESC error . 69
5.4.10 Data signalling rate . 70
5.4.11 Encoding layer management parameters . 71
5.5 Data link layer . 71
5.5.1 Introduction . 71
5.5.2 Data link layer interfaces . 71
5.5.3 Data link layer management interface . 72
5.5.4 Flow control. 73
5.5.5 Flow control errors . 74
5.5.6 Sending priority . 75
5.5.7 Link initialisation behaviour . 75
5.5.8 Link error recovery . 80
5.5.9 Accepting broadcast codes for sending . 82
5.6 SpaceWire network layer . 82
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5.6.1 Introduction . 82
5.6.2 SpaceWire packets . 83
5.6.3 Broadcast codes . 83
5.6.4 SpaceWire time-codes . 84
5.6.5 SpaceWire distributed interrupts . 87
5.6.6 SpaceWire nodes . 94
5.6.7 SpaceWire node management parameters . 96
5.6.8 SpaceWire routing. 96
5.6.9 SpaceWire routing switch management parameters . 104
5.6.10 SpaceWire network . 104
5.7 SpaceWire management information base . 106
5.7.1 Introduction . 106
5.7.2 General . 106
5.7.3 Physical layer management parameters . 106
5.7.4 Encoding layer management parameters . 106
5.7.5 Data link layer management parameters . 106
5.7.6 Network layer management parameters . 106
6 Service interfaces . 107
6.1 Network layer service interface . 107
6.1.1 Packet service interface . 107
6.1.2 Time-code service interface . 108
6.1.3 Distributed interrupt service interface . 109
6.2 Data link layer service interface . 111
6.2.1 N-Char service interface. 111
6.2.2 Broadcast code service interface . 113
6.3 Encoding layer service interface . 114
6.3.1 Encoding service interface . 114
6.3.2 Decoding service interface . 115
6.4 Physical layer service interface . 117
6.4.1 Line transmit service interface . 117
6.4.2 Line receive service interface . 118
6.5 Management information base service interface . 119
6.5.1 Set parameter service interface. 119
6.5.2 Get parameter service interface . 119
Annex A (informative) Technical Changes . 121
Bibliography . 123
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Figures
Figure 3-1: Convention for first bit to be sent . 21
Figure 3-2: Graphical packet notation . 22
Figure 3-3: State diagram style . 22
Figure 3-4: UML notation . 23
Figure 4-1: Example SpaceWire Architecture without redundancy . 27
Figure 4-2: SpaceWire Packet Format . 29
Figure 4-3: Path Addressing . 31
Figure 4-4 Logical Addressing . 32
Figure 5-1: SpaceWire protocol stack . 34
Figure 5-2: SpaceWire port architecture . 37
Figure 5-3: SpaceWire connector contact identification . 44
Figure 5-4: SpaceWire cable assembly Type A . 47
Figure 5-5: SpaceWire cable assembly Type AL . 49
Figure 5-6: SpaceWire LVDS . 53
Figure 5-7: LVDS line driver output signals. 54
Figure 5-8: LVDS line driver differential output signal . 56
Figure 5-9: Physical layer components . 59
Figure 5-10: Skew and jitter . 62
Figure 5-11: Data character encoding . 64
Figure 5-12: Control character encoding . 65
Figure 5-13: Null control code encoding . 65
Figure 5-14: Broadcast code encoding . 66
Figure 5-15: Parity coverage . 66
Figure 5-16: Data-Strobe (DS) encoding . 67
Figure 5-17: Data and strobe signals for first Null . 68
Figure 5-18: Null detection sequence . 69
Figure 5-19: Link initialisation behaviour . 76
Figure 5-20: Link error recovery behaviour . 81
Figure 5-21: SpaceWire packet format . 83
Figure 5-22: Specialisations and relationships of a SpaceWire broadcast code . 84
Figure 5-23 Network layer time-code . 85
Figure 5-24: Network layer interrupt . 88
Figure 5-25: Network layer interrupt acknowledgement code . 89
Figure 5-26: Components and specialisations of a SpaceWire node . 95
Figure 5-27: Components of a SpaceWire routing switch . 97
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Figure 5-28: Components of a SpaceWire network . 105

Tables
Table 5-1: Constants for a SpW cable using 28 AWG differential pairs . 39
Table 5-2: Insertion loss values 28AWG SpW cable . 40
Table 5-3: Constants for a SpaceWire cable using 26 AWG differential pairs . 40
Table 5-4: Insertion loss values for 26 AWG SpaceWire cable . 40
Table 5-5: Cable PSNEXT specification . 41
Table 5-6: Cable PSELFEXT specification . 41
Table 5-7: Connector contact identification . 43
Table 5-8: Cable assembly Type A signal wire connections . 47
Table 5-9: Cable assembly Type AL signal wire connections . 49
Table 5-10 Example calculation of maximum bit rate . 61
Table 5-11: Address function . 99


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European Foreword
This document (FprEN 16603-50-12:2019) has been prepared by Technical Committee CEN/CLC/TC 5
“Space”, the secretariat of which is held by DIN (Germany).
This document (FprEN 16603-50-12:2019) originates from ECSS-E-ST-50-12C Rev.1.
This document is currently submitted to the UAP.
This document has been developed to cover specifically space systems and will therefore have
precedence over any EN covering the same scope but with a wider do-main of applicability (e.g. :
aerospace).

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1
Scope
SpaceWire technology has grown from the needs of spacecraft on-board data
handling applications. This Standard provides a formal basis for the
exploitation of SpaceWire in a wide range of future on-board processing
systems.
One of the principal aims of SpaceWire is the support of equipment
compatibility and reuse at both the component and subsystem levels. In
principle a data-handling system developed for an optical instrument, for
example, can be used for a radar instrument by unplugging the optical sensor
and plugging in the radar one. Processing units, mass-memory units and down-
link telemetry systems developed for one mission can be readily used on
another mission, reducing the cost of development, improving reliability and
most importantly increasing the amount of scientific work that can be achieved
within a limited budget.
Integration and test of complex on-board systems is also supported by
SpaceWire with ground support equipment plugging directly into the on-board
data-handling system. Monitoring and testing can be carried out with a
seamless interface into the on-board system.
SpaceWire is the result of the efforts of many individuals within the European
Space Agency, European Space Industry and academia.
This standard may be tailored for the specific characteristics and constraints of a
space project in conformance with ECSS-S-ST-00.
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2
Normative references
The following normative documents contain provisions which, through
reference in this text, constitute provisions of this ECSS Standard. For dated
references, subsequent amendments to, or revision of any of these publications
do not apply. However, parties to agreements based on this ECSS Standard are
encouraged to investigate the possibility of applying the more recent editions of
the normative documents indicated below. For undated references, the latest
edition of the publication referred to applies.
EN reference Reference in text Title
EN 16601-00-01 ECSS-S-ST-00-01 ECSS system - Glossary of terms
EN 16602-70-08 ECSS-Q-ST-70-08 Space product assurance - Manual soldering of high-
reliability electrical connections
EN 16602-70-26 ECSS-Q-ST-70-26 Space product assurance - Crimping of high-reliability
electrical connections
ESCC 3401 Connectors, electrical, non-filtered circular and
rectangular, ESCC Generic Specification no. 3401,
Issue 5, March 2018
ESCC 3401/029:2017 Connectors, Electrical, Rectangular, Microminiature,
based on type MDMA, ECSS Detail Specification no.
3401/029, Issue 15, November 2017.
ESCC 3401/077:2016 Connectors, Electrical, Rectangular, Microminiature,
Removable Crimp Contacts, based on type MDMA,
ECSS Detail Specification no. 3401/077, Issue 7, April
2016.
ESCC 3902/003:2014 Cable, “SpaceWire”, Round, Quad using Symmetric
Cables, Flexible, –200 to +180 °C, Detail Specification
no. 3902/003, Issue 4, November 2014.
ESCC 3902/004:2014 Cable, Low Mass, “SpaceWire”, Round, Quad using
Symmetric Cables, Flexible, –100 to +150 °C, Detail
Specification no. 3902/004, Issue 1, October 2014.
MIL-DTL-17J:2014 Military Specification: Cables, Radio, Frequency,
th
Flexible and Semirigid, General Specification for, 10
February 2014.
TIA-644-A:2012 TIA-644-A, Electrical Characteristics of Low Voltage
Differential Signalling (LVDS) Interface Circuits,
Revision A, Reaffirmed 12/07/12, Telecommunications
Industry Association, 2012.
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3
Terms, definitions and abbreviated terms
3.1 Terms from other standards
For the purpose of this Standard, the terms and definitions from ECSS-S-ST-00-01
apply.
3.2 Terms specific to the present standard
The UML diagrams of Figure 5-22, Figure 5-26, Figure 5-27 and Figure 5-28 in
clause 5.6 illustrate the relationships between various terms used within this
standard.
3.2.1 allocated output port
output port that a packet is routed through
3.2.2 after 6,4 μs
delay of 6,4 μs (nominal) measured from when a state is entered
3.2.3 after 12,8 μs
delay of 12,8 μs (nominal) measured from when a state is entered
3.2.4 AutoStart
management parameter set by hardware or software which when asserted
allows an enabled SpaceWire port to start the SpaceWire link only when a Null
is received
3.2.5 bit error rate
ratio of the number of bits received in error to the total number of bits sent
across a link
3.2.6 broadcast code
time-code or distributed interrupt code
3.2.7 broadcast code identifier
two-bit code that identifies the type of broadcast code: 0b00 identifies a time-
code and 0b10 identifies a distributed interrupt code
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3.2.8 byte
eight bits
3.2.9 cargo
some information for transfer from a source to a destination which is
encapsulated in a packet
3.2.10 character
control character or data character
3.2.11 coding
act of translating a set of bits into another set of bits which are more appropriate
for transmitting across a medium
3.2.12 configuration port
port in a routing switch or node that gives access to a configuration node
3.2.13 configuration node
type of node whose purpose is to configure the routing switch or node that it is
part of
3.2.14 control character
ESC, FCT, EOP or EEP character that is used to pass control information across
a link
3.2.15 control code
sequence of an ESC followed by an FCT forming a Null which is used to keep a
link active, or a sequence of an ESC character followed by a data character
forming a broadcast code which is used to broadcast time-codes and
distributed interrupt codes over a SpaceWire network
3.2.16 control symbol
control character encoded in 4-bits for transfer across a link
3.2.17 data character
character that is used to pass 8 bits of data across a link
3.2.18 data link layer
protocol layer which is responsible for the initialisation of a SpaceWire link, for
transferring packets and broadcast codes over the link and for recovery from
errors on the link
3.2.19 data rate
rate at which the application data is transferred across a link
3.2.20 data signalling rate
rate at which the bits constituting control and data symbols are transferred
across a link
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3.2.21 data-strobe
sequence of data bits and bit clock encoded into two signals, one containing the
data bit sequence (data) and the other changing state whenever the data bit
sequence does not (strobe)
3.2.22 data symbol
data character encoded in 10 bits for transfer across a link
3.2.23 decoding
act of translating an encoded set of bits back into the original set of bits prior to
encoding
3.2.24 de-serialisation
transformation of a serial bit stream into a sequence of control or data symbols
3.2.25 destination
end-point that a packet is being sent to
3.2.26 destination address
route, described by a path address, to be taken by a packet in moving from
source to destination or an identifier, in the form of a logical address,
specifying the destination
3.2.27 destination node
node that is the destination of one or more SpaceWire packets
3.2.28 disconnect
indication from a receiver that there has been no edge on the data or strobe
signals for the past 850 ns (nominal) indicating that the link is disconnected
3.2.29 distributed interrupt
interrupt that is distributed to all or many nodes on the network
3.2.30 distributed interrupt code
broadcast code used to distribute interrupts over a SpaceWire network which
is either an interrupt code or an interrupt acknowledgement code
3.2.31 driver
electronic circuit that transmits signals across a particular transmission medium
3.2.32 driver ground
ground at the 0V pin or pins of the driver differential outputs
NOTE If the driver has one 0V for signals such as TTL
or CMOS, and a separate 0V for the differential
outputs, the driver ground is the 0V for the
differential outputs. The driver ground is a
ground plane or planes which provide
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