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routing through planes

Hi all,

I'm new to Allegro tools
and I'm experiencing a problem
when routing through power planes.

I've setup this simple stackup

top
gnd       neg. plane
vcc        neg. plane
bottom

If the router (manual or auto)
places a via between top and bottom layers,
the DRC shows a spacing violation with gnd.

'Item 1

' Class:           DRC ERROR CLASS
' Subclass:        GND
' Origin xy:       (1503.56 1230.00)
'
' CONSTRAINT:      Shape to Thru Via Spacing
' CONSTRAINT SET: DEFAULT
' CONSTRAINT TYPE: NET SPACING CONSTRAINTS
'    Constraint value: 5 MIL
'    Actual value:     0 MIL

This happens when the power planes have been etched
(either before or after routing).

Why there is no clearance beetwen the via
and the etched planes?
How can I avoid this error?

Regards,

Giohdl

Originally posted in cdnusers.org by giohdl

archive over 18 years ago

1. make sure in the cross-section the planes are "planes" and negative is checked.

2. use dynamic shapes.

Originally posted in cdnusers.org by KenM
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archive over 18 years ago

Thank you very much.

I had omitted the second point.

Regards

Originally posted in cdnusers.org by giohdl
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