Generic differential design routing with CCAR

Hi,
I am trying to route a differential design and need pairs of pins to
be routed in parallel (eg. A & A_b routing must be parallel with 2um
spacing between layers). It seems though that I can make rules to do
this for one specific design, but not in general for all differential
designs in CCAR. Am I missing something or is SkiLL code required to
somehow create the do file?? Any help is appreciative. Thanks in
advance.

 

I don't use this tool that often, but sometimes I do use it for
different customers, and when I do use it, it is usually for routing
digital signals. Basically, I typically do the analog work by hand
(not that many signals, and you get exactly what you want) and then I
block out my analog sections and created my digital channels for
routing. I then route the several hundred digital controls with the
tool, and also I use it to route bias currents (I add minimum width
rules, create a class of bias signals, and then add additional
spacings from this class to all other signals, etc). Although, you can
route diff pairs, it just requires some time and deeper understanding,
etc, to get it done right, which I never had the time and was not able
to use the tool on a more frequent, regular bases to justify spending
lots of time learning about it on a deeper level. It seemed to me
though, each design was somewhat unique, and I had to always adjust
the rules somewhat for each design. However, the router would do what
I asked except sometimes there was a reason why it was misbehaving
(not enough room, etc.).

 

Thanks for your insight. It seems like the only way is to define rules
in the DO file as you stated for each design. I guess I will try to
write some skill code to grab diff pair names and see if I can create
a core list of rules in the do file. Thanks.