[PCB_FORUM] Re: [BULK] - Differential Pairs on 15.2

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
______________________________

-----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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