FlexRay通信系统电气物理层规范V2.1修订本B.pdf_数字信号处理教材pdf资源-CSDN文库

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FlexRay Communications System

Electrical Physical Layer Specification

Version 2.1

Revision B

FlexRay通信系统电气物理层规范V2.1修订本B

FlexRay Electrical Physical Layer Specification Table of contents

Version 2.1 Revision B November-2006 Page 3 of 96

Table of contents

CHAPTER 1 INTRODUCTION ..................................................................................................................... 7

1.1 Objective............................................................................................................................................... 7

1.2 Overview............................................................................................................................................... 7

1.3 References ........................................................................................................................................... 7

1.4 Terms and definitions ........................................................................................................................... 8

1.5 List of abbreviations.............................................................................................................................. 8

1.6 Notational conventions ......................................................................................................................... 9

1.6.1 Parameter prefix conventions ......................................................................................................... 9

1.7 Important preliminary notes ................................................................................................................ 10

1.7.1 Bus speed ..................................................................................................................................... 10

1.7.2 Functional classes ........................................................................................................................ 10

1.7.3 System and conformance tests .................................................................................................... 10

1.8 Revision history .................................................................................................................................. 11

1.8.1 Changes applied to “E-PL spec v2.1 Revision A”......................................................................... 11

1.9 Open issues........................................................................................................................................ 11

CHAPTER 2 COMMUNICATION CHANNEL BASICS.............................................................................. 12

2.1 Objective............................................................................................................................................. 12

2.2 Propagation delay............................................................................................................................... 12

2.2.1 Asymmetric delay.......................................................................................................................... 13

2.3 Truncation........................................................................................................................................... 14

2.4 Symbol length change ........................................................................................................................ 15

2.5 Collisions ............................................................................................................................................ 15

2.6 EMC jitter ............................................................................................................................................ 16

2.6.1 EMC jitter on signal edges............................................................................................................ 16

2.6.2 EMC jitter on TSS-truncation ........................................................................................................ 16

2.6.3 EMC jitter on Symbol length change ............................................................................................ 16

2.7 Wake-up patterns ............................................................................................................................... 17

2.7.1 Overview ....................................................................................................................................... 17

2.7.2 Valid wake-up pattern ................................................................................................................... 17

2.7.3 Non valid wake-up patterns .......................................................................................................... 18

CHAPTER 3 PRINCIPLE OF FLEXRAY NETWORKING ......................................................................... 19

3.1 Objective............................................................................................................................................. 19

3.2 Interconnection of nodes .................................................................................................................... 19

CHAPTER 4 NETWORK COMPONENTS ................................................................................................. 21

4.1 Objective............................................................................................................................................. 21

4.2 Cables................................................................................................................................................. 21

4.3 Connectors ......................................................................................................................................... 21

FlexRay Electrical Physical Layer Specification Table of contents

Version 2.1 Revision B November-2006 Page 4 of 96

4.4 Cable termination ............................................................................................................................... 22

4.4.1 Terminated cable end ................................................................................................................... 22

4.4.2 Un-terminated cable end............................................................................................................... 23

4.5 Termination concept ........................................................................................................................... 23

4.6 Common mode chokes....................................................................................................................... 24

4.7 DC bus load ........................................................................................................................................ 24

CHAPTER 5 NETWORK TOPOLOGY....................................................................................................... 26

5.1 Objective............................................................................................................................................. 26

5.2 Point-to-point connection.................................................................................................................... 26

5.3 Passive star ........................................................................................................................................ 27

5.4 Linear passive bus.............................................................................................................................. 28

5.5 Active star network ............................................................................................................................. 29

5.6 Cascaded active stars ........................................................................................................................ 30

5.7 Hybrid topologies................................................................................................................................ 31

5.8 Dual channel topologies ..................................................................................................................... 31

CHAPTER 6 ELECTRICAL SIGNALING................................................................................................... 32

6.1 Objective............................................................................................................................................. 32

6.2 Overview............................................................................................................................................. 32

6.3 Bus state: Idle_LP .............................................................................................................................. 32

6.4 Bus state: Idle..................................................................................................................................... 32

6.5 Bus state: Data_1 ............................................................................................................................... 33

6.6 Bus state: Data_0 ............................................................................................................................... 33

CHAPTER 7 SIGNAL INTEGRITY ............................................................................................................. 34

7.1 Objective............................................................................................................................................. 34

7.2 Definition of test planes ...................................................................................................................... 34

7.3 Eye-diagram at TP1............................................................................................................................ 35

7.4 Eye-diagram at TP4 (only valid for point-to-point connections) ......................................................... 36

CHAPTER 8 ELECTRICAL BUS DRIVER................................................................................................. 37

8.1 Overview............................................................................................................................................. 37

8.2 Operation modes ................................................................................................................................ 38

8.2.1 BD_Normal mode ......................................................................................................................... 38

8.2.2 BD_Standby mode........................................................................................................................ 38

8.2.3 BD_Sleep mode (optional)............................................................................................................ 38

8.2.4 BD_ReceiveOnly mode (optional) ................................................................................................ 38

8.3 Operation mode transitions ................................................................................................................ 39

8.4 Bus Driver – Communication Controller interface .............................................................................. 40

8.4.1 TxD/TxEN behavior in case a Bus Driver - Bus Guardian interface is implemented.................... 40

8.4.2 TxD/TxEN - behavior in case a Bus Driver - Bus Guardian interface is not implemented ........... 41

8.4.3 RxD - behavior .............................................................................................................................. 41

8.5 Bus Driver – Bus Guardian interface (optional).................................................................................. 42

FlexRay Electrical Physical Layer Specification Table of contents

Version 2.1 Revision B November-2006 Page 5 of 96

8.6 Bus Driver – Host interface................................................................................................................. 43

8.6.1 Overview ....................................................................................................................................... 43

8.6.2 Hard wired signals (Option A)....................................................................................................... 43

8.6.3 Serial Peripheral Interface (SPI) (Option B).................................................................................. 46

8.7 Bus Driver – Power supply interface .................................................................................................. 46

8.7.1 V

supply voltage monitoring ...................................................................................................... 47

8.7.2 V

BAT

supply voltage monitoring ..................................................................................................... 47

8.7.3 Inhibit output (optional) ................................................................................................................. 48

8.8 Bus Driver - Level shift interface (optional) ........................................................................................ 48

8.8.1 V

voltage monitoring................................................................................................................... 48

8.9 Bus Driver - Bus interface................................................................................................................... 49

8.9.1 Receiver characteristics................................................................................................................ 49

8.9.2 Receiver behavior ......................................................................................................................... 50

8.9.3 Receiver timing characteristics ..................................................................................................... 52

8.9.4 Receiver behavior at transition from idle to active and vice versa................................................ 54

8.9.5 Transmitter characteristics............................................................................................................ 56

8.9.6 Transmitter behavior at transition from idle to active and vice versa ........................................... 58

8.9.7 Bus Driver - bus interface behavior, when not powered............................................................... 59

8.9.8 Bus Driver - bus interface behavior under short-circuit conditions ............................................... 59

8.10 Bus Driver – Wake-up interface (optional) ....................................................................................... 60

8.10.1 Local Wake-up operating requirements...................................................................................... 60

8.11 Remote Wake-up event detector (optional)...................................................................................... 60

8.11.1 Remote Wake-up operating requirements.................................................................................. 60

8.12 Bus Driver behavior under fault conditions....................................................................................... 61

8.12.1 Environmental errors................................................................................................................... 61

8.12.2 Behavior of unconnected digital input signals ............................................................................ 62

8.12.3 Dynamic low battery voltage....................................................................................................... 63

8.12.4 Bus failure detection ................................................................................................................... 64

8.12.5 Over-temperature protection....................................................................................................... 64

8.13 Bus Driver functional classes ........................................................................................................... 65

8.13.1 Functional class “Bus Driver voltage regulator control” .............................................................. 65

8.13.2 Functional class “Bus Driver - Bus Guardian interface”.............................................................. 65

8.13.3 Functional class “Bus Driver internal voltage regulator” ............................................................. 65

8.13.4 Functional class “Bus Driver logic level adaptation” ................................................................... 65

8.14 Bus Driver signal summary............................................................................................................... 66

CHAPTER 9 ACTIVE STAR....................................................................................................................... 68

9.1 Overview............................................................................................................................................. 68

9.2 Hardware realization........................................................................................................................... 68

9.2.1 Active star - Communication Controller interface (optional) ......................................................... 69

9.2.2 Active star - Bus Guardian interface (optional)............................................................................. 69

9.2.3 Active star - Power supply interface ............................................................................................. 69

9.2.4 Active star - Bus interface............................................................................................................. 69

9.3 Basic functionality............................................................................................................................... 69

9.4 Enhanced functionality ....................................................................................................................... 70

9.4.1 Functional class: “Active Star - Communication Controller interface” .......................................... 70

9.4.2 Functional class: “Active Star - Bus Guardian interface” .............................................................. 71

9.4.3 Functional class "Active Star - Voltage regulator control" ............................................................ 71

9.4.4 Functional class "Active Star - Internal voltage regulator"............................................................ 71

9.5 Active Star timing characteristics ....................................................................................................... 71

9.6 Active Star operation modes .............................................................................................................. 72

9.6.1 AS_Sleep ...................................................................................................................................... 72

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