[En-Nut-Discussion] some questions

[Austin Schutz]

On Fri, Nov 08, 2002 at 10:18:07AM -0800, Austin Schutz wrote:
> On Fri, Nov 08, 2002 at 09:53:07AM +0100, Harald Kipp wrote:
> > 
> > >
> > >I have some questions.
> > >
> > >1) In RTL8019, if mega103 access 0x8300(memory map),
> > >    can it believe "  I am accessing RTL8019 " without RTL8019 chip ID?
> > >
> > >   is it possible?
> > >
> > >   I think that if mega103 can access 0x8300, RTL8019 chip ID is not 
> > > necessary.
> > 
> > I'm sorry, but I do not understand this question.
> > Can you please explain in other words?
> 
> 	I might be wrong, but I think the question is "can you know the
> device at 0x8300 is the rtl8019 without checking the rtl8019 id?", the
> answer being "yes".
...

	By the way, the 8019 also supports a "plug and play" id which can
be stored in eeprom. That's something completely different which can be
used to tell if a device at a certain address is an 8019 and not some other
kind of device if it's inside a PC. Ethernut doesn't use or need it because
the device at 0x8300 is always hardwired to be the 8019. Maybe some day when
the Ethernut supports removable ISA cards like
http://www.ethernut.de/en/isa/index.html it will use the PnP ID
capability. :-)

	Austin