[SI-LIST] Re: Length Matching for Interlaken and CFP Trace
- From: Jory McKinley <jory_mckinley@xxxxxxxxx>
- To: "vinu@xxxxxxxxx" <vinu@xxxxxxxxx>, "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
- Date: Thu, 2 Aug 2012 16:05:18 -0700 (PDT)
Hello Vinu,
The table is indeed the skew compensation through connectors (table header did
not format) and is between lanes, this has to be simulated of course and
back-drilling will more than likely be required.
I am not aware of or have implemented the 80UI spec for 10.3125GB/s but the
40UI across all lanes has to be met for the board @ 6.25GB/s, there is another
67UI for the chip for a total lane to lane budget of 107UI.
-Jory
________________________________
From: Vinu Arumugham <vinu@xxxxxxxxx>
To: si-list@xxxxxxxxxxxxx
Sent: Thursday, August 2, 2012 4:21 PM
Subject: [SI-LIST] Re: Length Matching for Interlaken and CFP Trace
Jory,
The table you provided is connector skew compensation to be accounted
when trying to get to +/-3ps P/N match. It seems unrelated to lane-lane
skew.
Lane-lane mismatch allowed seems to be 40UI at 6.25Gbps and 80UI at
10.3125Gbps.
Thanks,
Vinu
On 08/01/2012 07:47 AM, Jory McKinley wrote:
> Hello Dan,
> There are three different constraints you need to match.
> (1) Between P/N of a given differential pair--> 3ps
> (2) Within lanes as in table below
> (3) TX and RX maximum skew of 107UI overall
> -Jory
>
>
> ________________________________
> From: Dan <signal.integrity2@xxxxxxxxx>
> To: Jory McKinley <jory_mckinley@xxxxxxxxx>
> Cc: "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
> Sent: Tuesday, July 31, 2012 5:51 PM
> Subject: [SI-LIST] Re: Length Matching for Interlaken and CFP Trace
>
> 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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