GUARANTEEING INTEROPERABILITY OF EFFICIENT AND FLEXIBLE WAKE-UP/SLEEP IN A 100BASE-T1 ENVIRONMENT PHILIP AXER (NXP) FABIAN NIKOLAUS (C&S)

Transcription

1 GUARANTEEING INTEROPERABILITY OF EFFICIENT AND FLEXIBLE WAKE-UP/SLEEP IN A 100BASE-T1 ENVIRONMENT PHILIP AXER (NXP) FABIAN NIKOLAUS (C&S)

2 Ethernet Domain-Based Network ADAS DC 1. MPU DC Body-Comfort Typical automotive networks à heterogenous DC Infotainment DC Drivetrain 2. Multiple Ethernet vendors involved 3. Is interoperability guaranteed? Vendor A Vendor B Vendor C AUTOMOTIVE TECHNOLOGY DAY 1

3 OPEN TC10 Wakeup/Sleep Rational Cars are responsible for around 12% of total EU emissions of carbon dioxide [1] New ADAS and electric vehicle use-cases Over the air update Overnight charging Remote connectivity Pragmatic and fast way of enabling/disabling ECUs Not all functionality is used anytime à selective 1. Support fast wake-up and wake-up request forwarding to support a global wake-up on layer 1 2. Support controlled link shutdown to hibernate selected parts of network [1] AUTOMOTIVE TECHNOLOGY DAY 2

4 OPEN TC10 Primitives & Mechanisms AUTOMOTIVE TECHNOLOGY DAY 3

5 Example Topology 3 Port Switch 3 Port Switch Switch Switch 2 Cameras Transmission ECU / Engine ECU AUTOMOTIVE TECHNOLOGY DAY 4

6 Sleep over Active Link Use-case: Switch needs to power-off cameras Sleep Request (LPS) Switch L P S L P S Switch AUTOMOTIVE TECHNOLOGY DAY 5

7 Wakeup over passive link Use-case: Switch wakes up cameras Wakeup Request (WUP) Switch W U P W U P Switch AUTOMOTIVE TECHNOLOGY DAY 6

8 Wakeup Forwarding over active and passive link (WUP and WUR) Use-case: Wakeup event at gear selector wakes entire system Switch Switch Wakeup Request Subsystem in sleep AUTOMOTIVE TECHNOLOGY DAY 7

9 Wakeup Forwarding over active and passive link (WUP and WUR) Use-case: Wakeup event at gear selector wakes entire system Switch Switch W U P W U P W U P WUR Wakeup Request Subsytem in sleep AUTOMOTIVE TECHNOLOGY DAY 8

10 Sleep Handshake Sleep Initiator Sleep Responder loc_sleep_req NORMAL NORMAL Sleep.indication Sleep.indication REQ SLEEP_ACK SLEEP_RE QEST Time window to abort sleep SILENT SILENT Wakeup.request SLEEP SLEEP NORMAL (link training) NORMAL (link training) AUTOMOTIVE TECHNOLOGY DAY 9

11 Sleep Handshake Sleep Initiator Sleep Responder loc_sleep_req NORMAL NORMAL Sleep.indication REQ SILENT SLEEP_ACK SLEEP_RE QEST SILENT Time window to abort sleep Sleep.indication Each state is associated with defined timing à Interoperatility test ensures correctness across vendors Wakeup.request SLEEP SLEEP NORMAL (link training) NORMAL (link training) AUTOMOTIVE TECHNOLOGY DAY 10

12 Interoperability AUTOMOTIVE TECHNOLOGY DAY 11

13 Interoperability Challenges Multi-Supplier-Solutions (Mis-)Interpretation is especially a problem in an environment in which products of different suppliers have to interoperate One single specified standard can be interpreted differently by different implementers, because: Human language itself is ambiguous A specified standard might contain coverage gaps, missing details The implementer might misunderstand the specification AUTOMOTIVE TECHNOLOGY DAY 12

14 Wake-up/Sleep IOP Test Suite Facts and Numbers 13 Test cases Reflecting in 46 instances Master/Slave, Swapped Polarity, Channel Type Test Groups AUTOMOTIVE TECHNOLOGY DAY 13

15 Timing Measurement - Wake-up Wakeup over an active link TWU_Link_active <1ms Wakeup over a passive link TWU_Link_passive <2ms Start Start _wakeup.request _DUT _wakeup.request _DUT _wakeup.indication _LP _wakeup.indication _LP Stop Stop powered unpowered Link established Link not established Measurement Path AUTOMOTIVE TECHNOLOGY DAY 14

16 Timing Measurement - Sleep Local sleep request T_LinkSleep <16ms Remote sleep request T_LinkSleep <24ms Start Start _sleep.request _sleep.indication _DUT _sleep.request _DUT Stop _LP _sleep.indication _LP Stop powered unpowered Link established Link not established Measurement Path AUTOMOTIVE TECHNOLOGY DAY 15

17 Timing Measurement Forwarding Wakeup forwarding integrated TWU_Forwarding <1ms Wakeup forwarding via optional I/O TWU_WakeIO <1ms Stop Stop Forwarding Logic 1_DUT 2_DUT WUR Wake I/O Wake I/O 1_DUT 2_DUT WUR Start Start powered unpowered Link established Link not established Measurement Path AUTOMOTIVE TECHNOLOGY DAY 16

18 Example: Reception of a Wakeup Pulse Reception of a Wakeup Pulse (WUP) TWU_Link_passive + T_Powersupply_Stable + T Initialization 2ms + 5ms + 10ms <17ms Start _wakeup.request _LP _wakeup.indication SUP _DUT INH Stop Power Supply powered unpowered Link established Link not established Measurement Path AUTOMOTIVE TECHNOLOGY DAY 17

19 Conclusion Wakeup & Sleep over dataline will eventually replace legacy wakeup lines Seemless transition / co-existance possible Advanced use-cases: wakeup forwarding Scales to other Ethernet physical layers Interoperability integrated into OPEN Alliance TC-1 IOP Concept specification from OPEN TC10 transfered to ISO IOP tests will be available from 01/2018 AUTOMOTIVE TECHNOLOGY DAY 18

20 Questions? AUTOMOTIVE TECHNOLOGY DAY 19

21 BACKUP AUTOMOTIVE TECHNOLOGY DAY 20

22 Timing Measurement Power Supply Stable T_Powersupply_Stable 90% of nominal value Initialization T Initialization <10ms <5ms Stop Stop SUP _DUT INH WUP _wakeup.indication Start SUP _DUT INH WUP Power Supply Start Power Supply powered Link established unpowered Link not established Measurement Path AUTOMOTIVE TECHNOLOGY DAY 21