[SI-LIST] PICMG3.1 : is length matching really necessary?
- From: Daniel.Peron@xxxxxxxxxx
- To: si-list@xxxxxxxxxxxxx
- Date: Thu, 23 Nov 2006 17:05:12 +0100
Hi all,
In PICMG3.0, there is a requirement for length matching between the pairs
of a fabric interface channel : 2.54mm max.
Even for 10G backplane Ethernet type applications (PICMG3.1 / 10GBase-CX4)
this seems exagerated, as data are aligned at PCS level.
--> in 802.3 clause 48.2.4.2.2 there is a skew budget table, which
allocates 2UI (=2x320ps) for PCB (board) skew and 18UI for the
transmission medium (backplane) skew.
Is my understanding of the standard correct or do I miss something?
Thanks for your help.
Regards.
Daniel Peron
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