Re: [PATCH v2 2/4] can: fixed-transceiver: Add documentation for CAN fixed transceiver bindings

[Oliver Hartkopp]

On 07/28/2017 06:57 AM, Kurt Van Dijck wrote:

> So while _a_ transceiver may be spec'd to 1MBit during arbitration,
> CAN FD packets may IMHO exceed that speed during data phase.

When the bitrate is limited to 1Mbit/s you are ONLY allowed to use 
1Mbit/s in the data section too (either with CAN or CAN FD).

> That was the whole point of CAN FD: exceed the limits required for
> correct arbitration on transceiver & wire.

No. CAN FD is about a different frame format with up to 64 bytes AND the 
possibility to increase the bitrate in the data section of the frame.

> So I do not agree on the single bandwidth limitation.

The transceiver provides a single maximum bandwidth. It's an ISO Layer 1 
device.

> The word 'max-arbitration-bitrate' makes the difference very clear.

I think you are mixing up ISO layer 1 and ISO layer 2.

Regards,
Oliver