Yes， we will provide that, but need few months to achieve.

* Please note that, except where crossing a plane break (i.e a region where there is no plane under the traces), differential pairs do not normally need to be routed adjacent to each other (like the line on a railway). As long as they are matched in length they can be routed as two single ended tracks. This is in fact easier to design because setting and maintaining the differential impedance of closly spaced pairs (i.e. less than about 3 trace widths edge-to-edge spacing) is quite hard to accurately specify, design and maintain in production. As the edges of the two traces are moved together as a proportion of their trace widths, the differential impedance falls very rapidly so it is very sensitive to the production process variations in edge to edge gap (clearance). Separate single ended traces are much less sensitive to this because the clearances are usually much greater than required for closely coupled differential pairs. * Basically unless you are using a PCB process that is optimised to make coplanar waveguides, closely coupled pairs are going to be expensive to guarantee the repeatability of. If you *are* using a PCB process that is optimised to make coplanar waveguides then they'll be even more expensive but repeatable. * So, a tool that can concentrate on length matching between the two traces is more important than dealing with close spacing. * If the differential pair is crossing any region with no plane under the traces then yes, they do need to be closely coupled but if at all possible this should be avoided anyway: most of the time it is just plain bad PCB design practice. :) * More on this: http://www.sigcon.com/Pubs/news/2_30.htm