Olin Lathrop wrote:

> Gerhard Fiedler wrote:
>> CAN doesn't include a spec for the hardware layer.
> 
> The original Bosch spec certainly did.

Really? What do you call the "original Bosch spec"? Do you have a link
to or a copy of a Bosch CAN spec that defines the physical layer?

The Bosch spec I know (see
<http://www.semiconductors.bosch.de/pdf/can2spec.pdf> ) says that "the
scope of this specification is to define the transfer layer and the
consequences of the CAN protocol on the surrounding layers" -- and with
that specifically exclude the physical layer. They also write that
"there may be, however, much freedom in selecting a physical layer."
Also, on page 4 of part A of this document, they add "CAN" in
parentheses to the object and transfer layers, but not to the physical
layer, kind of implying that there is no CAN physical layer (as opposed
to the transfer layer, for example). They use similar wording in the
introduction of part B (page 34f).

Gerhard
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