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RE: XGMII or SPI-4 ?

Hi Wang,
I feel both XGMII and SPI-4 will co-exist. XGMII is meant for only ethernet frames. SPI-4 is designed for a mix of Ethernet frames, IP packets and ATM cells. One of the functions of the MAC is assembling ethernet frames. So, there has to be a MAC in the Link device to send assembled ethernet frames to the PHY device through SPI-4 interface. It is redundant to have a MAC again in the PHY device. So, whether one uses XGMII or SPI-4 as the interface, it makes sense to have the MAC on the link layer side of the interfaces.
Andy Annadurai
SynTera Corporation
Fremont, CA
(510) 360-0700
-----Original Message-----
From: Wang Wendeh []
Sent: Wednesday, May 09, 2001 1:55 PM
Subject: XGMII or SPI-4 ?

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!