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Re: XAUI/XGXS Question


In principle, yes is is. However, this requires that the MAC transmit packets in
order for the PHY to perform the deskew operation. This method was considered
and rejected by those the folks developing the XAUI/XGXS deskew protocol in
favor of a column Align (/A/) codes which can perform the deskew function in the
presence or absence of MAC packets.

A second order benefit of adding /A/ to the XAUI/XGXS /K/R/ Idle stream is a
reduction of the EMI effects of the Idle stream.  

Best Regards,

Boaz Shahar wrote:
> Can anyone help with the following:
> Why the /A/ Code word is needed? Isn't it sufficient to do Skew Elimination
> between the lanes whenever the first data word (Dxx.y code-word) and the /S/
> code-word in lane 0 appears after IPG?
> Thanks,
> Boaz
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