Can interface with enhanced fault confinement

Details Can interface with enhanced fault confinement Can interface with enhanced fault confinement

1994-10-11

1997-02-04

Beausoliel, Jr., Robert W.

39518502, G06F 1100

Patent

active

056007825

ABSTRACT:
A CAN node having an enhanced fault recovery system is disclosed. The CAN node includes a CAN protocol controller device which reconnects to a CAN bus from the node's busoff state only after the node has successfully decoded 128 good messages from other devices on the CAN bus. Such a system advantageously provides a CAN node which exits its busoff state with a high degree of confidence that the fault that caused the node to enter the busoff state has been cleared. The protocol controller device uses the eleven recessive bits that start at the acknowledgement delimiter and finish at the end of the third bit of intermission to recognize that a single message has been successfully decoded.

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A. Raab, "Can--Controller Area Network." Elector Electronics, vol. 18, No. 203 (Sep. 1992), Canterbury GB, pp. 56-59.
Robert Bosch GmbH, "CAN Specification, Version 2.0", Sep. 1991, pp. Part B--33 through Part B--68.
Philips Semiconductors, "Preliminary Product Specification, Version 2.0", Jun. 1992, pp. 1 through 58.
Motorola Ltd., Motorola Product Specification Booklet, "MC68HC05X4, MC68HC705X4: High-Density Complementary Metal Oxide Semiconductor (HCMOS) Microprocessor Unit", 1992, 81 pgs.
Kevin Hare, Julian Powell, and Peter Zimmermann, "Fault Confinment of the CAN Protocol", 1991, pp. 1-15.
Intel Product Review, "82527 Serial Communications Controller Product Preview", Aug. 1992, pp. 1-59.

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