[SI-LIST] Re: Length Matching for Interlaken and CFP Trace
- From: Dan <signal.integrity2@xxxxxxxxx>
- To: Jory McKinley <jory_mckinley@xxxxxxxxx>
- Date: Tue, 31 Jul 2012 14:51:43 -0700
HI Jory and Vinu,
then you mean to say, for interlaken, the length matching should be done
within the pair, that is between P and N. lets say if the transmit
connector have Tx0-Tx12, 12 differential pairs, i needn't length between
the diff pair? only with P and N of each diff pair?
Regards
Dan
On Tue, Jul 31, 2012 at 8:41 AM, Jory McKinley <jory_mckinley@xxxxxxxxx>wrote:
> Hello Dan,
> Interlaken:
> Electrical skew between P/N differential pairs should be under 3ps this
> includes the connector regardless of TX or RX. Also
> Interlaken Interoperability Recommendations Rev 1.6 has a lane to lane skew
> maximum as:
>
> Lanes Skew(ps)
> 0, 3, 4, 7 10
> 1, 2, 5, 6 2.5
> 8, 9 , 11 8.0
> 10, 12, 13, 14, 15 7.5
>
> These hold for all TX and RX but not between them. I think there is an
> overall channel spec out there that covers TX and RX maximum skew of 107UI
> but 67UI of this is for the Chip and 40UI for board.
>
> Physical matching is a good start but you will have to simulate the
> channel through the connector and most probable have to back drill the
> connectors at least 0, 3, 4 and 7.
> -Jory
>
>
> ------------------------------
> *From:* Dan <signal.integrity2@xxxxxxxxx>
> *To:* si-list@xxxxxxxxxxxxx
> *Sent:* Monday, July 30, 2012 2:53 PM
> *Subject:* [SI-LIST] Length Matching for Interlaken and CFP Trace
>
> HI All,
> we are designing board with Interlaken and CFP signals for operating 10Gig
> signals. can any one tell me how the lanes should be length matched.
>
> interlaken: is it length matching within connector? that is all Tx are
> length matched and all Rx are legngth matched and NOT between Tx and Rx.
> CFP: Same as above. Tx and Rx are length matched whithin the group and not
> between them?
>
> Thanks Dan.
>
>
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