In a message dated 10/2/2003 3:02:38 AM Eastern Daylight Time, [EMAIL PROTECTED] writes:
> I have a couple of questions about the autorouter and multilayer boards. > > I know everyone will say to manually route it, and I will probably end > up doing it manually, but is there a way to use the autorouter and > specify the preferred layer to route the net on? I would like to do a 4 > layer design and I want to use the outer layers as much as I can and the > autorouter just seems to pick whatever layer it feels like if I use 4 > routing layers and no power planes. The downfall of this is that I was > thinking of just placing a polygon fill for the power planes but this > routing strategy cuts up the polygons too much and I am not happy with > the gnd plane this way. > > Or, is there a way to allow the autorouter to place a net class on the > inner ground or power plane layer? This is why I am using 4 routing > layers, when really all I would like to do is to route my data and > address busses on the inner layers since my power nets are not > complicated and there is a lot of unused real estate there. > I'd do this by making the inner layers planes, and "routing" the extra nets using split planes, as long as it's not too complicated. You can make a split plane arbitrarily complex (but don't nest them within one another), effectively making an island of whatever shape you like to route a specific net on the inner layers. After hand-routing the specific nets you want on the inner layers this way, then turn the autorouter loose on the outer layers. Steve Hendrix * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * To post a message: mailto:[EMAIL PROTECTED] * * To leave this list visit: * http://www.techservinc.com/protelusers/leave.html * * Contact the list manager: * mailto:[EMAIL PROTECTED] * * Forum Guidelines Rules: * http://www.techservinc.com/protelusers/forumrules.html * * Browse or Search previous postings: * http://www.mail-archive.com/[EMAIL PROTECTED] * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
