Re: XGMII or SPI-4 ?
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
>
>
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