[PCB_FORUM] Re: [BULK] - Differential Pairs on 15.2
- From: "David Greig" <david@xxxxxxxxxxxxxx>
- To: <icu-pcb-forum@xxxxxxxxxxxxx>
- Date: Thu, 30 Jun 2005 17:02:34 +0100
Hi Carl
If you've got an expert seat then pin delay can be used for this.
Best Regards
David Greig
______________________________
GigaDyne Ltd
http://www.gigadyne.co.uk
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-----Original Message-----
From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Austin Franklin
Sent: 2005-June-30 16:35
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: [BULK] - Differential Pairs on 15.2
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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