Re: XGMII or SPI-4 ?
WenDeh,
Again, it is up to the implementor (MAC/PHY vendor) whether
it will be built this way and up to the market whether it
will be bought. The "PHY" device is more complicated, perhaps,
but it relieves the system developer from having to design
or buy the MAC separately.
Regards,
Ben
Wang Wendeh wrote:
>
> Hi Ben,
>
> Thank you for the valuable information. You mentioned that SPI-4 is an
> interface
> above MAC layer, so that means the MAC will be needed to be implemented in
> the PHY device, right? It is kind of different than before. I don't know if
> it will make
> the PHY device to be too complicated.
>
> WenDeh
>
> ----- Original Message -----
> From: Ben Brown <bbrown@xxxxxxxx>
> To: Wang Wendeh <wendeh@xxxxxxxxxxxxx>
> Cc: <stds-802-3-hssg@xxxxxxxx>
> Sent: Wednesday, May 09, 2001 9:13 PM
> Subject: Re: XGMII or SPI-4 ?
>
> >
> >
> > WenDeh,
> >
> > The XGMII is specified in the standard as between the MAC/RS
> > and the PHY layers. The SPI-4 is not a part of the IEEE standard
> > but rather an interface specified by the OIF. It is often
> > considered to exist "above" the MAC layer. Since it is not
> > specified, and since none of the interfaces specified in the
> > P802.3ae draft are mandatory, the use of either, neither or
> > both is completely acceptable. The market will eventually
> > decided which interfaces are preferred.
> >
> > Ben
> >
> > > Wang Wendeh wrote:
> > >
> > > Hi all,
> > >
> > > Maybe this thread has been discussed before, but I just added in this
> > > mailing list for a few days.
> > > Can anyone tell me which one ( XGMII or SPI-4) will be adopted for
> > > implementation between
> > > link-layer and physical-layer device? The 10G standard proposes XGMII,
> > > while it seems to be that
> > > vendors favor SPI-4, right? Or maybe this two interfaces can co-exist
> > > ??
> > >
> > > Thanks a lot!
> > >
> > > WenDeh
> >
> >
> > --
> > -----------------------------------------
> > Benjamin Brown
> > AMCC
> > 2 Commerce Park West
> > Suite 104
> > Bedford NH 03110
> > 603-641-9837 - Work
> > 603-491-0296 - Cell
> > 603-626-7455 - Fax
> > 603-798-4115 - Home Office
> > bbrown@xxxxxxxx
> > -----------------------------------------
> >
--
-----------------------------------------
Benjamin Brown
AMCC
2 Commerce Park West
Suite 104
Bedford NH 03110
603-641-9837 - Work
603-491-0296 - Cell
603-626-7455 - Fax
603-798-4115 - Home Office
bbrown@xxxxxxxx
-----------------------------------------