Re: A Question about "Inter Packet Gap and SOP Lane alignment"
Boaz,
Your question is answered in a presentation made at the La Jolla meeting:
"8B/10B Idle Pattern for 12-byte IPG" by
Rich Taborek and Don Alderrou of nSerial,
http://grouper.ieee.org/groups/802/3/ae/public/jul00/taborek_1_0700.pdf
This proposal modifies the fixed starting /A/K/R/ Idle pattern for all
applications of 8B/10B encoded 4-lane streams was accepted into the set of
baseline proposals along with the core XAUI/XGXS proposal. The specific change
is as follows:
1) No change to EOP column which contains the first 1 to 4 columns of the IPG.
Note that the EOP counts towards IPG.
2) Transmit /A/ or /R/ randomly while maintaining minimum 16 column /A/ spacing.
3) Transmit /R/
4) Transmit /K/, /R/ or /A/ randomly while maintaining minimum 16 column /A/
spacing until SOP detected.
Note that this proposal works for IPGs as small as 9. Detailed state machines
are included at the end of the PDF file.
Best Regards,
Rich
--
Boaz Shahar wrote:
>
> Hello Steve,
> I have a question in regards to your presentation "Inter Packet Gap..." in
> the last meeting:
>
> You suggest to use only 2 columns of Idle as a minimum for IPG. In previous
> proposals (e.g.
> http://grouper.ieee.org/groups/802/3/ae/public/may00/taborek_2_0500.pdf
> slide 14) the suggested gap is a minimum of 3 columns-/A/, /K/, and /R/. So:
> Can you please say which of them should be eliminated, or define a procedure
> which say which type of Idle columns should be inserted?
>
> Thanks,
> Boaz
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