Flexray communications using ethernet

• US 9,088,514 B2
• Filed: 12/17/2012
• Issued: 07/21/2015
• Est. Priority Date: 07/23/2012
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Kim, Yongbum, Brown, Kevin
• Primary Examiner(s): Chriss, Andrew
• Assistant Examiner(s): Ahmed, Atique
• Application Number:
  US13/716,577
• Publication Number:
  US 20140022912A1
• Time in Patent Office: 946 Days
• Field of Search: 370/224, 370/401, 370/392, 370/442, 370/390
• US Class Current: 1/1
• CPC Class Codes: H04L 12/40163 by assigning priority to messages according to a message field
• CPC Class Codes: H04L 2012/40241 Flexray
• CPC Class Codes: H04L 2012/40273 the transportation system being a vehicle
• CPC Class Codes: H04L 47/805 QOS or priority aware
• CPC Class Codes: H04L 49/35 Switches specially adapted for specific applications
• CPC Class Codes: H04L 49/351 for local area network [LAN], e.g. Ethernet switches
• CPC Class Codes: H04L 49/555 Error detection
• CPC Class Codes: H04L 67/12 specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks

Abstract

Systems and methods for implementing FlexRay communications between FlexRay nodes using Ethernet are provided. An Ethernet switch includes ports, each of which receives an Ethernet data packet (EDP) from a respective FlexRay node. Each EDP includes a FlexRay message, which includes at least one of a data frame and a frame identification (ID). A first EDP is received at a first port no later than a second EDP is received at a second port. The Ethernet switch also includes a controller module that determines whether the second EDP has higher priority than the first EDP based on the frame IDs associated with the first and second EDPs. The controller module is configured to route the second EDP to a second destination no later than routing the first EDP to a first destination and meet FlexRay transmission cycle times when it has been determined that the second EDP has higher priority.

Claims

1. An Ethernet switch for implementing FlexRay communications between a plurality of FlexRay nodes, the Ethernet switch comprising:

a plurality of ports each of which is configured to receive an Ethernet data packet from a respective FlexRay node over a respective Ethernet link, each Ethernet data packet comprising a FlexRay message, each FlexRay message comprising at least one of a data frame and a frame identification (ID), wherein a first Ethernet data packet is received at a first one of the plurality of ports no later than a second Ethernet data packet is received at a second one of the plurality of ports; and

a controller module configured to determine whether the second Ethernet data packet has higher priority than the first Ethernet data packet based on the frame ID associated with the first Ethernet data packet and the frame ID associated with the second Ethernet data packet,

wherein the controller module is further configured to route the first Ethernet data packet to a first destination and the second Ethernet data packet to a second destination, the controller module being configured to route the second Ethernet data packet to the second destination no later than routing the first Ethernet data packet to the first destination when it has been determined that the second Ethernet data packet has higher priority than the first Ethernet data packet.

2. The Ethernet switch of claim 1, wherein each of the plurality of FlexRay nodes comprises a FlexRay controller and an Ethernet adaptation module.

3. The Ethernet switch of claim 1, wherein the controller module is configured to route the second Ethernet data packet to the second destination before routing the first Ethernet data packet to the first destination when it has been determined that the second Ethernet data packet has higher priority than the first Ethernet data packet.

4. The Ethernet switch of claim 1, wherein each frame ID identifies a time slot in which a corresponding data frame is scheduled to be transmitted, wherein the frame ID associated with the second Ethernet data packet identifies a dynamic time slot, wherein the frame ID associated with the first Ethernet data packet identifies a dynamic time slot, and wherein the frame ID associated with the second Ethernet data packet is less than the frame ID associated with the first Ethernet data packet.

5. The Ethernet switch of claim 1, wherein the controller module is configured to suspend the routing of the first Ethernet data packet when it has been determined that the second Ethernet data packet has higher priority than the first Ethernet data packet.

6. The Ethernet switch of claim 5, wherein the controller module is further configured to resume routing of the first Ethernet data packet after the second Ethernet data packet has been routed.

7. The Ethernet switch of claim 1, wherein the controller module is further configured to determine the second destination.

8. The Ethernet switch of claim 7, wherein the second destination comprises a) a single one of the plurality of FlexRay nodes excluding the FlexRay node corresponding to the second one of the plurality of ports, b) two or more of the plurality of FlexRay nodes excluding the FlexRay node corresponding to the second one of the plurality of ports, or c) all of the plurality of FlexRay nodes excluding the FlexRay node corresponding to the second one of the plurality of ports.

9. The Ethernet switch of claim 1, further comprising a clock module coupled to the controller module, wherein the clock module is configured to provide a primary reference clock to the controller module, and wherein the controller module is configured to provide the primary reference clock to one or more of the plurality of FlexRay nodes.

10. The Ethernet switch of claim 9, wherein the clock module is further configured to generate a transmit clock based on a timing of the FlexRay message associated with the second Ethernet data packet, and wherein the controller module is configured to route the second Ethernet data packet based on the transmit clock.

11. The Ethernet switch of claim 1, wherein the controller module is configured to detect a FlexRay message error and to transmit an Ethernet fault message to one or more of the plurality of FlexRay nodes based on the detection of the FlexRay message error.

12. A FlexRay node for implementing FlexRay communications using Ethernet, the FlexRay node comprising:

an Ethernet adaptation module configured to receive a reference clock; and

a FlexRay module configured to generate a FlexRay message based on the reference clock, the FlexRay message comprising a data frame and a frame identification (ID) identifying a time slot based on the reference clock in which the data frame is scheduled to be transmitted,

wherein the Ethernet adaptation module is configured to generate an Ethernet data packet based on the FlexRay message and to provide the Ethernet data packet to a transceiver for transmitting the Ethernet data packet to a destination over an Ethernet physical channel.

13. The FlexRay node of claim 12, wherein the Ethernet adaptation module is configured to encapsulate the FlexRay message as the Ethernet data packet.

14. The FlexRay node of claim 12, further comprising the transceiver, wherein the transceiver is configured to transmit the Ethernet data packet to the destination, wherein the transceiver is configured to receive the reference clock over the Ethernet physical channel, and wherein the transceiver is configured to transmit the Ethernet data packet during the time slot.

15. The FlexRay node of claim 12, wherein the Ethernet physical channel comprises a shared Ethernet bus.

16. The FlexRay node of claim 12, wherein the Ethernet adaptation module is configured to detect an Ethernet fault message and provide a FlexRay message error to the FlexRay module based on the detection of the Ethernet fault message.

17. A method for implementing FlexRay communications between a plurality of FlexRay nodes using Ethernet, the method comprising:

receiving a first Ethernet data packet from a first one of the plurality of FlexRay nodes and a second Ethernet data packet from a second one of the plurality of FlexRay nodes, the first Ethernet data packet being received no later than the second Ethernet data packet, the first Ethernet data packet comprising a first FlexRay message having at least one of a first data frame and a first frame identification (ID), the second Ethernet data packet comprising a second FlexRay message having at least one of a second data frame and a second frame ID;

determining whether the second Ethernet data packet has higher priority than the first Ethernet data packet based on the first frame ID and the second frame ID;

suspending routing of the first Ethernet data packet when it has been determined that the second Ethernet data packet has higher priority than the first Ethernet data packet; and

routing the second Ethernet data packet to a second destination no later than routing the first Ethernet data packet to a first destination based on the suspension of routing of the first Ethernet data packet.

18. The method of claim 17, further comprising determining the first destination and the second destination, wherein the first destination comprises a first set of the plurality of FlexRay nodes, and wherein the second destination comprises a second set of the plurality of FlexRay nodes different from the first set of the plurality of FlexRay nodes.

19. The method of claim 18, wherein the second Ethernet data packet is routed to the second destination at the same time as when the first Ethernet data packet is routed to the first destination.

20. The method of claim 17, wherein the first Ethernet data packet and the second Ethernet data packet are routed over a shared Ethernet bus.