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TMS320F280039C: Configure MCAN as CNAFD, and the arbitration segment and the data segment use different bit rates

Yale Li 李耀先
Expert 4660 points

Part Number: TMS320F280039C

Hi Team,

My customer wants to use different bitrates between arbitration segment and data segment.

Like, 

arbitration segment 500kbps, data segment 5Mbps;

arbitration segment 100kbps, data segment 5Mbps.

How to achieve this?

--

Thanks & Regards

Yale

  • +1
    TI__Guru* 95315 points

    Yale,     

                    A given bit-rate can be achieved with multiple combinations of NBTP/DBTP values. CAN is unlike other protocols in this aspect. For example, a given bit-rate can be achieved with different sampling-points. Sampling points are chosen based on the network parameters such as bus length, transceiver propagation delay, delay introduced by galvanic isolation etc. Since each network is different, we cannot suggest a “universal” value. I have shown the formula used in page 15 of www.ti.com/lit/SPRACE5A. Understand that is DCAN and you are asking about MCAN, but the computation is exactly identical.