64/66 control code mapping

["Benjamin J. Brown" <bebrown@xxxxxxxxxxxxxxxxxx>]

Rick Walker,

I've been looking at your 64b/66b presentation and, in
particular, looking at your control code mapping. The
7-bit line code is specific to encodings from the 8b10b
XAUI interface. This is an optional interface and may
not exist between all MAC and PCS layers. When the XAUI
doesn't exist, what 7-bit line codes should be used?

Given the protocol stack shown by Brad Booth, I would
expect that this PCS layer be specified to an XGMII
and not to an XAUI. Implementations may choose to short-
cut the conversion from XAUI to XGMII to 64b/66b but
the specification should assume it communicates to the
XGMII.

Thanks,
Ben Brown

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