1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS ISO 17458-4:2013Road vehicles FlexRaycommunications systemPart 4: Electrical physical layer specificationBS ISO 17458-4:2013 BRITISH STANDARDNational forewordThis British Stan
2、dard is the UK implementation of ISO 17458-4:2013.The UK participation in its preparation was entrusted to TechnicalCommittee AUE/16, Electrical and electronic equipment.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport
3、 to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2013. Published by BSI StandardsLimited 2013ISBN 978 0 580 76715 9ICS 43.040.15Compliance with a British Standard cannot confer immunity fromlegal obligations.Th
4、is British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 January 2013.Amendments issued since publicationDate Text affectedBS ISO 17458-4:2013Reference numberISO 17458-4:2013(E)ISO 2013INTERNATIONAL STANDARD ISO17458-4First edition2013-02-01Road vehic
5、les FlexRay communications system Part 4: Electrical physical layer specification Vhicules routiers Systme de communications FlexRay Partie 4: Spcification de la couche dapplication lectrique BS ISO 17458-4:2013ISO 17458-4:2013(E) COPYRIGHT PROTECTED DOCUMENT ISO 2013 All rights reserved. Unless oth
6、erwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISOs member body in the country of the requester. ISO copyrig
7、ht office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2013 All rights reservedBS ISO 17458-4:2013ISO 17458-4:2013(E) ISO 2013 All rights reserved iii Contents Page Foreword . v Introduction vi
8、1 Scope 1 2 Normative references 1 3 Terms, definitions, symbols and abbreviated terms . 1 3.1 Terms and definitions . 1 3.2 Abbreviated terms . 10 3.3 Symbols 12 4 Document reference according to OSI model 13 5 Conventions . 14 5.1 General . 14 5.2 Notational and parameter prefix conventions 14 5.3
9、 Important preliminary notes . 15 6 Communication channel basics 16 6.1 Objective. 16 6.2 Propagation delay . 16 6.3 Frame TSS length change 18 6.4 Symbol length change 18 6.5 FES1 length change 19 6.6 Collisions 19 6.7 Stochastic jitter 20 6.8 Wakeup patterns 20 7 Principle of FlexRay networking 22
10、 7.1 Objective. 22 7.2 Interconnection of nodes 22 7.3 Electrical signalling . 23 8 Network components 24 8.1 Objective. 24 8.2 Cables . 24 8.3 Connectors . 25 8.4 Cable termination 25 8.5 Termination concept . 27 8.6 Common mode chokes . 27 8.7 DC bus load 27 9 Network topology 28 9.1 Objective. 28
11、 9.2 Point-to-point connection . 29 9.3 Passive star 29 9.4 Linear passive bus 30 9.5 Active star network . 31 9.6 Cascaded active stars . 32 9.7 Hybrid topologies 32 9.8 Dual channel topologies . 33 10 Asymmetric delay budget . 33 10.1 Objective. 33 10.2 Basic topology for asymmetric delay budget.
12、34 10.3 Definition of Test Planes . 34 BS ISO 17458-4:2013ISO 17458-4:2013(E) iv ISO 2013 All rights reserved 10.4 Requirements to the asymmetric delay budget 36 10.5 Definition of maximum asymmetric delay portions . 36 10.6 Other networks . 43 11 Signal integrity . 43 11.1 Objective . 43 11.2 Mask
13、test at TP1 / TP11 . 44 12 Electrical bus driver 49 12.1 Overview . 49 12.2 Operation modes . 50 12.3 Operation mode transitions 51 12.4 Bus driver communication controller interface . 53 12.5 Bus driver bus guardian interface (optional) . 57 12.6 Bus driver host interface . 57 12.7 Bus driver power
14、 supply interface 61 12.8 Bus driver - level shift interface (optional) 63 12.9 Bus driver - bus interface . 63 12.10 Bus driver wakeup interface (optional) 77 12.11 Remote wakeup event detector (optional) 78 12.12 Bus driver behaviour under fault conditions 80 12.13 Bus driver functional classes .
15、85 12.14 Bus driver signal summary . 87 13 Active Star 88 13.1 Overview . 88 13.2 Hardware overview 88 13.3 Signal timing 90 13.4 Active star device operation modes 98 13.5 Autonomous power moding flag (APM flag) . 100 13.6 Branch operating states 101 13.7 Branch transmitter and receiver circuit 104
16、 13.8 Active star - communication controller interface (optional) . 105 13.9 Active star bus guardian interface (optional) 115 13.10 Active star host interface (optional) . 115 13.11 Active star power supply interface . 115 13.12 Active star level shift interface (optional) 118 13.13 Active star bus
17、 interface 118 13.14 Active star wake interface (optional) 119 13.15 Active star functional classes 119 13.16 Active star behaviour under fault conditions . 120 13.17 Active star signal summary 122 14 Interface definitions . 123 14.1 Overview . 123 14.2 Communication controller bus driver interface
18、123 14.3 Host . 126 15 General features for FlexRay physical layer parts . 127 15.1 Objective . 127 15.2 Voltage limits for digital output signals 127 15.3 Input voltage thresholds for digital signals 127 15.4 ESD protection on chip level (HBM) 128 15.5 ESD protection on chip level (IEC61000-4-2) 12
19、8 15.6 ESD protection on ECU level 128 15.7 Operating temperature 128 15.8 Serial peripheral interface (SPI) . 129 Annex A (informative) Application notes 131 BS ISO 17458-4:2013ISO 17458-4:2013(E) ISO 2013 All rights reserved v Foreword ISO (the International Organization for Standardization) is a
20、worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented
21、 on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are draft
22、ed in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Stan
23、dard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 17458-4 was prepared
24、 by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 3, Electrical and electronic equipment. ISO 17458 consists of the following parts, under the general title Road vehicles FlexRay communications system: Part 1: General information and use case definition Part 2: Data link layer specif
25、ication Part 3: Data link layer conformance test specification Part 4: Electrical physical layer specification Part 5: Electrical physical layer conformance test specification BS ISO 17458-4:2013ISO 17458-4:2013(E) vi ISO 2013 All rights reserved Introduction The FlexRay communications system is an
26、automotive focused high speed network and was developed with several main objectives which were defined beyond the capabilities of established standardized bus systems like CAN and some other proprietary bus systems. Some of the basic characteristics of the FlexRay protocol are synchronous and async
27、hronous frame transfer, guaranteed frame latency and jitter during synchronous transfer, prioritization of frames during asynchronous transfer, single or multi-master clock synchronization, time synchronization across multiple networks, error detection and signalling, and scalable fault tolerance. T
28、he FlexRay communications system is defined for advanced automotive control applications. It serves as a communication infrastructure for future generation high-speed control applications in vehicles by providing: A message exchange service that provides deterministic cycle based message transport;
29、Synchronization service that provides a common time base to all nodes; Start-up service that provides an autonomous start-up procedure; Error management service that provides error handling and error signalling; Wakeup service that addresses the power management needs. Since start of development the
30、 automotive industry world-wide supported the specification development. The FlexRay communications system has been successfully implemented in production vehicles today. The ISO 17458 series specifies the use cases, the communication protocol and physical layer requirements of an in-vehicle communi
31、cation network called “FlexRay communications system“. This part of ISO 17458 has been established in order to define the electrical physical layer of the FlexRay data link. To achieve this, it is based on the Open Systems Interconnection (OSI) Basic Reference Model specified in ISO/IEC 7498-1 and I
32、SO/IEC 10731, which structures communication systems into seven layers. When mapped on this model, the protocol and physical layer requirements specified by ISO 17458 are broken into: Diagnostic services (layer 7), specified in ISO 14229-1 7, ISO 14229-4 9; Presentation layer (layer 6), vehicle manu
33、facturer specific; Session layer services (layer 5), specified in ISO 14229-2 8; Transport layer services (layer 4), specified in ISO 10681-2 1; Network layer services (layer 3), specified in ISO 10681-2 1; Data link layer (layer 2), specified in ISO 17458-2, ISO 17458-3; Physical layer (layer 1), s
34、pecified in ISO 17458-4, ISO 17458-5; in accordance with Table 1. BS ISO 17458-4:2013ISO 17458-4:2013(E) ISO 2013 All rights reserved vii Table 1 FlexRay communications system specifications applicable to the OSI layers Applicability OSI 7 layers FlexRay communications system Vehicle manufacturer en
35、hanced diagnostics Seven layer according to ISO 7498-1 and ISO/IEC 10731 Application (layer 7) vehicle manufacturer specific ISO 14229-1, ISO 14229-4 Presentation (layer 6) vehicle manufacturer specific vehicle manufacturer specific Session (layer 5) vehicle manufacturer specific ISO 14229-2 Transpo
36、rt (layer 4) vehicle manufacturer specific ISO 10681-2 Network (layer 3) vehicle manufacturer specific Data link (layer 2) ISO 17458-2, ISO 17458-3 Physical (layer 1) ISO 17458-4, ISO 17458-5 Table 1 shows ISO 17458 Parts 2 5 being the common standards for the OSI layers 1 and 2 for the FlexRay comm
37、unications system and the vehicle manufacturer enhanced diagnostics. The FlexRay communications system column shows vehicle manufacturer specific definitions for OSI layers 3 7. The vehicle manufacturer enhanced diagnostics column shows application layer services covered by ISO 14229-4 which have be
38、en defined in compliance with diagnostic services established in ISO 14229-1, but are not limited to use only with them. ISO 14229-4 is also compatible with most diagnostic services defined in national standards or vehicle manufacturers specifications. The presentation layer is defined vehicle manuf
39、acturer specific. The session layer services are covered by ISO 14229-2. The transport protocol and network layer services are specified in ISO 10681. BS ISO 17458-4:2013BS ISO 17458-4:2013INTERNATIONAL STANDARD ISO 17458-4:2013(E) ISO 2013 All rights reserved 1 Road vehicles FlexRay communications
40、system Part 4: Electrical physical layer specification 1 Scope This part of ISO 17458 specifies the electrical physical layer for FlexRay communications systems. The electrical physical layer for FlexRay is designed for time-triggered networks with data-rates up to 10 Mbit/s to connect automotive el
41、ectronic control units (ECUs). The medium that is used is dual wires. Signalling on the bus is accomplished by asserting a differential voltage between those wires. Topology variations range from point-to-point connections via linear passive busses and passive stars up to active star topologies. Thi
42、s part of ISO 17458 includes the definition of electrical characteristics of the transmission itself and also documentation of basic functionality for bus driver (BD) and active star (AS) devices. 2 Normative references The following referenced documents are indispensable for the application of this
43、 document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 17458-1, Road vehicles FlexRay communications system Part 1: General information and use case definition ISO 17458-2, Road ve
44、hicles FlexRay communications system Part 2: Data link layer specification 3 Terms, definitions, symbols and abbreviated terms 3.1 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 17458-1, ISO 17458-2 and the following apply. 3.1.1 alternating current b
45、usload AC busload equivalent circuit of a passive star from transmitting view of the bus driver 3.1.2 active elements components which work with power supply and amplifiers 3.1.3 active star network AS network all point-to-point connections plugged to an AS BS ISO 17458-4:2013ISO 17458-4:2013(E) 2 I
46、SO 2013 All rights reserved 3.1.4 activity See “bus state“ NOTE activity distinguishes two states: Data_0 and Data_1. 3.1.5 Activity signal to the Central_Logic when this communication path is not idle(see also NoActivity) 3.1.6 asymmetric delay budget maximum bit-deformation in the time domain NOTE
47、 It is derived from the specified synchronization and sampling procedure and the properties of their implementation. When transmitting a FlexRay data stream the receiving CC must be able to detect the data without any error. If the asymmetric delay of the data stream is higher than the asymmetric de
48、lay budget, the decoder samples faulty bit values. 3.1.7 asymmetric delay bit-deformation in the time domain when passing a data stream e.g. via a BD EXAMPLE A data steam is applied to the BDs input TxD: 00100 The single 1 at the centre shall have a length of 100 ns The BD passes the data stream to
49、its output BP and BM. The single 1 may be shortened or lengthened a little bit to e.g. 102 ns In this case the asymmetric delay has to be determined to 2 ns. 3.1.8 bus driver bus driver interface BD-BD-interface consideration of all involved effects of the timing of each BD/AS NOTE The timing is specified based on measurement set-ups easy to be used. When connecting two BDs/ASs (via e.g. a passive star) the resulting delays are not equal to twice
