ISO 17458-4:2013

INTERNATIONAL ISO
STANDARD 17458-4
First edition
2013-02-01
Road vehicles— FlexRay
communications system —
Part 4:
Electrical physical layer specification
Véhicules routiers — Système de communications FlexRay —
Partie 4: Spécification de la couche d'application électrique

Reference number
©
ISO 2013
©  ISO 2013
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ii © ISO 2013 – All rights reserved

Contents Page
Foreword . v
Introduction . vi
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 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
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
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. 34
10.3 Definition of Test Planes . 34
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 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 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 . 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
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 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 . 123
14.3 Host . 126
15 General features for FlexRay physical layer parts . 127
15.1 Objective .
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