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Early, accurate dependability analysis of CAN-based networked systems Acle, J. P., Reorda, M. S., & Violante, M. (2006). An active star.

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Presentation on theme: "Early, accurate dependability analysis of CAN-based networked systems Acle, J. P., Reorda, M. S., & Violante, M. (2006). An active star."— Presentation transcript:

1 dogan@yahoo.com

2 Early, accurate dependability analysis of CAN-based networked systems Acle, J. P., Reorda, M. S., & Violante, M. (2006). An active star topology for improving fault confinement in CAN networks Barranco, M., Proenza, J., Rodriguez-Navas, G., & Almeida, L. (2006). Apr 24, 2008 2 Fennibay

3 Technical structure Bus topology: wired-AND Arbitration done via dominant/recessive bits Event-driven Bit-level synchronization Fault-tolerance Bit stuffing CRC Acknowledge TEC/REC Error globalization Apr 24, 2008 3 Fennibay

4 Apr 24, 2008 4 Fennibay

5 Apr 24, 2008 5 Fennibay Types of failure Delayed frame (performance degradation) Missing frame Changed frame (incorrect answer) Blocked node Blocked bus

6 Special-purpose HW or SW for injecting faults No access to memory elements of nodes Only user-accessible regions in case of SW Simulation-based Cycle-accurate instruction set simulation Not all details of protocol controller represented Hardware Description Language simulation Pin-level fault injection MATLAB/Simulink Fault injection in the behavioral model Apr 24, 2008 6 Fennibay

7 Apr 24, 2008Fennibay 7

8 Apr 24, 2008 8 Fennibay

9 Apr 24, 2008Fennibay 9

10 Apr 24, 2008Fennibay 10 Courtesy: movinggraphics.ca => 9000 frames

11 Apr 24, 2008 11 Fennibay 10k faults injected

12 Apr 24, 2008Fennibay 12

13 Apr 24, 2008 13 Fennibay

14 Apr 24, 2008Fennibay 14

15 Apr 24, 2008Fennibay 15

16 Apr 24, 2008Fennibay 16 Use two media Ring topology Monitor nodes

17 Apr 24, 2008Fennibay 17

18 Apr 24, 2008Fennibay 18

19 Apr 24, 2008Fennibay 19

20 Advantages: CAN-compliant No modification in nodes Also works with CAN-based protocols: TTCAN etc. Disadvantages: Single point of failure More complex cabling Apr 24, 2008Fennibay 20

21 Apr 24, 2008Fennibay 21


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