CONTROLLER AREA NETWORK (CAN) DEVICE AND METHOD FOR EMULATING CLASSIC CAN ERROR MANAGEMENT

• US 20150095711A1
• Filed: 08/15/2014
• Published: 04/02/2015
• Est. Priority Date: 10/02/2013
• Status: Active Grant

• Current Assignee: NXP B.V. (NXP Semiconductors NV)
• Original Assignee: NXP B.V. (NXP Semiconductors NV)
• Inventors: Elend, Bernd
• Granted Patent: US 10,452,504 B2
• Time in Patent Office: Days
• US Class Current: 714/39
• CPC Class Codes: G06F 11/221 to test buses, lines or interfaces, e.g. stuck-at or open line faults
• CPC Class Codes: G06F 11/261 by simulating additional hardware, e.g. fault simulation
• CPC Class Codes: G06F 13/4072 Drivers or receivers G06F13/4086 takes precedence; for multistate logic circuits H03K19/0002
• CPC Class Codes: H04L 12/4135 using bit-wise arbitration
• CPC Class Codes: H04L 2012/40215 Controller Area Network CAN

Abstract

Embodiments of a device and method are disclosed. In an embodiment, a CAN device is disclosed. The CAN device includes a transmit data (TXD) input interface, a TXD output interface, a receive data (RXD) input interface, an RXD output interface and a traffic control system connected between the TXD input and output interfaces and between the RXD input and output interfaces. The traffic control system is configured to detect the presence of classic CAN traffic on the RXD input interface and if the presence of classic CAN traffic is detected on the RXD input interface, emulate an error management protocol of a classic CAN controller in response to signals received on the TXD input interface.

Claims

1. A Controller Area Network (CAN) device comprising:

a transmit data (TXD) input interface;

a TXD output interface;

a receive data (RXD) input interface;

an RXD output interface;

a traffic control system connected between the TXD input and output interfaces and between the RXD input and output interfaces, and configured to;

detect the presence of classic CAN traffic on the RXD input interface; and

if the presence of classic CAN traffic is detected on the RXD input interface, emulate an error management protocol of a classic CAN controller in response to signals received on the TXD input interface.

2. The CAN device of claim 1, wherein emulating the error management protocol of a classic CAN controller comprises generating an error frame/flag and transmitting the error frame/flag on the TXD output interface.

3. The CAN device of claim 1, wherein emulating the error management protocol of a classic CAN controller comprises generating an error frame/flag and transmitting the error frame/flag on the TXD output interface in response to determining that the classic CAN controller is in an error passive state from the signals received on the TXD input interface.

4. The CAN device of claim 1, wherein emulating the error management protocol of a classic CAN controller comprises generating an error frame/flag and transmitting the error frame/flag on the TXD output interface in response to determining that the classic CAN controller is in an error passive state from the signals received on the TXD input interface and from signal received on the RXD input interface.

5. The CAN device of claim 1, wherein the traffic control system is further configured to disconnect the TXD output interface from the TXD input interface and to output a dominant TXD on the TXD output interface when the TXD input interface is disconnected from the TXD input interface.

6. The CAN device of claim 1, wherein the traffic control system comprises a CAN protocol controller configured to decode CAN FD traffic received on the RXD input interface.

7. The CAN device of claim 6, wherein the traffic control system further comprises a transmit path multiplexer configured to direct traffic from the TXD input interface to the TXD output interface depending on whether or not CAN FD traffic is detected.

8. The CAN device of claim 6, wherein the traffic control system further comprises a receive path multiplexer configured to direct traffic from the RXD input interface to the RXD output interface depending on whether or not CAN FD traffic is detected.

9. A CAN transceiver device comprising a transmitter, a receiver, and a CAN bus interface, the CAN transceiver further comprising the CAN device of claim 1.

10. A method for controlling Controller Area Network (CAN) traffic, the method comprising:

decoding traffic received on an RXD input interface;

monitoring the decoded traffic for the presence of classic CAN traffic; and

if the presence of classic CAN traffic is detected on the RXD input interface, then emulating an error management protocol of a classic CAN controller in response to signals received on a TXD input interface.

11. The method of claim 10, wherein emulating the error management protocol of a classic CAN controller comprises generating an error frame/flag and transmitting the error frame/flag on a TXD output interface.

12. The method of claim 10, wherein emulating the error management protocol of a classic CAN controller comprises generating an error frame/flag and transmitting the error frame/flag on a TXD output interface in response to determining that the classic CAN controller is in an error passive state from the signals received on the TXD input interface.

13. The method of claim 10, wherein emulating the error management protocol of a classic CAN controller comprises generating an error frame/flag and transmitting the error frame/flag on a TXD output interface in response to determining that the classic CAN controller is in an error passive state from the signals received on the TXD input interface and from signals received on the RXD input interface.

14. The method of claim 10, further comprising outputting a dominant TXD on the TXD output interface when the TXD input interface is disconnected from the TXD output interface.