[PCB_FORUM] Re: [BULK] - Differential Pairs on 15.2
- From: "Austin Franklin" <austin@xxxxxxxxxxxx>
- To: <icu-pcb-forum@xxxxxxxxxxxxx>
- Date: Thu, 30 Jun 2005 11:34:59 -0400
Hi Carl,
> Has anyone had to deal with differential pairs in 15.2 that
> are not balanced out of the IC. The Mellanox
> InfiniHost_III_MT25208 spec that the PCIX bus diff pairs are
> not balanced out the chip and give the skews and states that the
> skew must be accounted for on the PC layout to balance the pair
> completely end to end. How would I configure this rule in
> allegro? For instance is there a way to tell the tool to route
> the + end 50 mils longer than - end?
Can't you set-up a match length group for the pair and use "delta" on one of
the legs and then the "tolerance" to 0 (or something small)?
Regards,
Austin
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