Draft:Controller Area Network XL

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Submission declined on 9 January 2023 by Mattdaviesfsic ( reliable sources. Reliable sources are required so that information can be verified. If you need help with referencing, please see Referencing for beginners and Citing sources. Declined by Mattdaviesfsic 15 months ago.

Submission declined on 24 August 2022 by Stuartyeates (talk). This draft's references do not show that the subject qualifies for a Wikipedia article. In summary, the draft needs multiple published sources that are: in-depth (not just passing mentions about the subject) reliable secondary independent of the subject Make sure you add references that meet these criteria before resubmitting. Learn about mistakes to avoid when addressing this issue. If no additional references exist, the subject is not suitable for Wikipedia. Declined by Stuartyeates 19 months ago.

Submission declined on 3 May 2022 by Stuartyeates (talk). Most of the references appear to be primary. The lede needs to be completely rewrite for the lay person. Declined by Stuartyeates 23 months ago.

Submission declined on 10 February 2022 by Slywriter ( reliable sources. Reliable sources are required so that information can be verified. If you need help with referencing, please see Referencing for beginners and Citing sources. This submission appears to read more like an advertisement than an entry in an encyclopedia. Encyclopedia articles need to be written from a neutral point of view, and should refer to a range of independent, reliable, published sources, not just to materials produced by the creator of the subject being discussed. This is important so that the article can meet Wikipedia's verifiability policy and the notability of the subject can be established. If you still feel that this subject is worthy of inclusion in Wikipedia, please rewrite your submission to comply with these policies. Declined by Slywriter 2 years ago.

• Comment: Lots of claims are uncited; Cites shouldn't be in headings; External links also need to be removed from body and/or added to a section at the bottom if relevant. Mattdaviesfsic (talk) 21:12, 9 January 2023 (UTC)

• Comment: Pretty much entirely self sourced, still.
  Stuartyeates (talk
  ) 05:21, 24 August 2022 (UTC)

• Comment: Just a self sourced brochure Slywriter (talk) 15:55, 10 February 2022 (UTC)

CAN XL (Controller Area Network eXtended Length) is an extension of the traditional CAN (Controller Area Network) protocol used in automotive and industrial applications for communication between electronic control units (ECUs). The CAN XL protocol was developed by CiA CAN in Automation and is designed to meet the increasing demand for higher bandwidth and longer data frames in modern vehicles and industrial applications.

CAN XL is the third

CAN XL increases the payload data length of a CAN frame from a maximum of 8 bytes in traditional CAN, from a maximum of 64 bytes in CAN FD (Flexible Data rate) to up to 2048 bytes, enabling faster transmission of large data packets. It also offers improved error detection and correction capabilities and supports the use of more flexible data rates up to 20 Mbit/s.

The CAN XL protocol is backward compatible with existing CAN FD^[2] networks, allowing for a smooth transition to the new protocol without requiring a complete overhaul of the existing infrastructure. The protocol is expected to be widely adopted in the automotive industry, where it can support emerging applications such as advanced driver assistance systems (ADAS) and autonomous driving. Other application example for the CAN XL is as a backbone in automotive E/E-Architecture.^[9]

Comparison of CAN, CAN FD and CAN XL

New Functions in CAN XL versus CAN FD

CAN XL offers higher speed, up to 20Mbit/s and data payload, up to 2048 byte compared to CAN FD.

Increases safety with 2x CRC included in the CAN XL protocol.^[10]

For higher layers (on Layer 2)^[11] the following features in the CAN XL were added:

• SDT (Service Data Type): SDU^[12] (Service Data Unit) Type (8 bit)
  • Indicates the type of the protocol embedded in the data field
  • In the CAN in Automation CiA611-1 (CAN XL higher layer functions - Part 1: Definition of service data unit types) already defines an SDT value for Ethernet Tunneling^[13]
• VCID: Virtual CAN Network ID (8 bit)
  • Allows to separate the CAN network/bus into up to 256 virtual networks
  • Comparable to
    VLAN
    ID in Ethernet
• AF: Acceptance Field (32 bit)
  • Depending on SDT (Service Data Type) it can contain
    • Message ID or
    • Source/Destination address
  • Allows to support both:
    • Content based addressing
    • Node based addressing

MAC frame format of the CAN XL

MAC frame format of CAN XL^[14]: See CiA610-1^[15] for the exact frame format.

• „Priority ID: 11-bit ID for bus arbitration, purpose: bus access priority
• „XL : Placeholder in this graphic for several Bits: e.g. Frame Format Switch → FD to XL Format
• ADS:  Arbitration Data Sequence → Bit Rate Switching from Arbitration to Data Phase, several bits
• SDT:  SDU (Service Data Type) Type (8 bit) → indicates the type of the protocol embedded in the data field (comparable to EtherType in Ethernet)
• SEC:  SEC (1 bit) signals, if further Layer 2 functions added headers to the data field (e.g. Security, Fragmentation)
• DLC:  Data Length Code (11 bit)
• SBC:  Stuff Bit Count → count of dynamic stuff bits in the arbitration field, safeguards against specific error types
• PCRC:  Preface CRC (13 bit) → Safeguards the bits up to PCRC
• VCID:  Virtual CAN Network ID (8 bit) → allows to separate the CAN Bus into virtual buses (comparable to VLAN ID in Ethernet)
• AF:  Acceptance Field (32 bit) → Field for the Addressing, the interpretation of this field depends on SDT
• Data:  1 to 2048 bytes user data
• FCRC:  Frame CRC (32 bit) → Safeguards the whole frame, i.e. the bits up to the FCRC
• FCP:  Format Check Pattern → Receiver checks if he is aligned to transmitted bit stream
• DAS:  Data Arbitration Sequence → Bit Rate Switching from Data to Arbitration Phase
• ACK:  Positive Acknowledgement, same as in CAN FD
• EOF: End of Frame, same as in CAN FD

Transceiver - Physical Layer for CAN XL

The CAN XL protocol can operate with all existing physical Transceiver^[16] for CAN and CAN FD and the newer CAN SIC (Signal Improvement Capability) Transceiver.^[17]

For CAN XL also a new type of Transceiver was defined, the CAN XL SIC Transceiver. This transceiver is defined in the released spec CiA 610-3.^[18]

The CAN XL SIC Transceiver with a data bit rate ≥ 8Mbit/s works with a push-pull topology and the Error Signalling is not available in this mode. This mode is called FAST mode.

The CAN XL SIC has two different modes:

1. SIC (Signal Improvement Capability) mode
   • dominant/recessive (like a CAN SIC transceiver)
   • data rate up to 8Mbit/s
2. FAST mode
   • TX node: push/pull (0/1)
   • RX node: adjust threshold
   • data rate higher than 8Mbit/s up to 20Mbit/s

Security

CAN XL offers better security possibilities than CAN FD, by implementing the new "CANsec" standard to be sent before frame buffers and ensure message authenticity.^[19]

Microcontroller compatibility

Infineon Technologies announced the TC4x series of controllers with CAN XL^[20]

NXP Semiconductors offers the NXP S32 Platform

ST Microelectronics offers the Stellar Integration MCUs

References