I use the autorouter often, but:
- I only use "Route All"
- Boards are not too complex, e.g., 5"x7", 4-layer, some fine-pitch but no
BGA.
- I use a layer-specific keepout, but I pre-routed all the nets within that
area.
FWIW, I did a Report of my design rules, and the ones marked "Rule Followed
By Router" are listed at the end of this message. (I deleted some Clearance
Constraint rules for specific nets; they're all similar to the first one
shown.)
If you search the archives, I think there have been discussions of
successfully doing BGA pre-fan-outs.
-----Original Message-----
From: Ted Tontis
Sent: Friday, January 25, 2002 9:20 AM
I can get the auto router to route the manual fan outs, and in some
locations I can get the auto router to just route the area I have selected.
I can never get the auto router to route the board without it
looking like it went through a skeet competition. This is why I figured I
would fan out the board by hand then area route the board and do it in
sections. I left just enough room to get the tracks in between the vias,
trying to keep it nice neat. This is not working as well as I had hoped. Can
any one share one success story with the auto router and possibly share the
setup they used. I know that there a only a few design rules that are
related to the auto router, maybe I am just missing one?
Thank you,
Ted
-------------------------------------
Clearance Constraint :
Enabled = Yes Name = TipRingClearance
Scope1 = TipRingVoltage
Scope2 = Board
Connectivity = Different Nets
Gap = 15mil
Rule Followed By Router
Enabled = Yes Name = ClearanceShort1X2
Scope1 = HDR-1X2-SH-T
Scope2 = HDR-1X2-SH-T
Connectivity = Different Nets
Gap = 0mil
Rule Followed By Router
Enabled = Yes Name = Clearance
Scope1 = Board
Scope2 = Board
Connectivity = Different Nets
Gap = 8mil
Rule Followed By Router
Width Constraint :
Enabled = Yes Name = EdgePullBack
Scope = No Net
Minimum = 8mil
Maximum = 50mil
Preferred = 8mil
Rule Followed By Router
Enabled = Yes Name = PowerWidth
Scope = Power
Minimum = 10mil
Maximum = 15mil
Preferred = 12mil
Rule Followed By Router
Enabled = Yes Name = GroundWidth
Scope = Grounds
Minimum = 10mil
Maximum = 20mil
Preferred = 10mil
Rule Followed By Router
Enabled = Yes Name = Width
Scope = Board
Minimum = 8mil
Maximum = 20mil
Preferred = 8mil
Rule Followed By Router
Routing Topology :
Enabled = Yes Name = RoutingTopology
Scope = Board
Topology = Shortest
Rule Followed By Router
Routing Layers :
Enabled = Yes Name = RoutingLayers
Scope = Board
Layers = Routing Layers
Rule Followed By Router
Routing Corners :
Enabled = Yes Name = RoutingCorners
Scope = Board
Style = 45-Degree
Minimum = 50mil
Maximum = 200mil
Rule Followed By Router
Routing Via Style :
Enabled = Yes Name = RoutingVias
Scope = Board
Min H. Size = 16mil
Max H. Size = 20mil
Pref. H. Size = 16mil
Min Width = 32mil
Max Width = 40mil
Pref. Width = 32mil
Style =
Rule Followed By Router
--end
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