I have a 4 layer design with power and ground filling both internal layers
with no internal routing just vias. I want to set up a restriction to
prevent the power plane filling an area. How do I set up the internal
restriction?
I have a 4 layer design with power and ground filling both internal layers
with no internal routing just vias. I want to set up a restriction to
prevent the power plane filling an area. How do I set up the internal
restriction?
There is no direct way to do this.
All restrictions works on top and bottom layers, only.
I have a pcb antenna myself with same problem. I did make signals on all
4 layers, and then made 2=polygon fill gnd and 15=polygon fill with vcc
Christen
On 5/26/2010 9:22 AM, Tony wrote:
I have a 4 layer design with power and ground filling both internal
layers with no internal routing just vias. I want to set up a
restriction to prevent the power plane filling an area. How do I set up
the internal restriction?
Hi Tony,
You might be better off just turning the inner layers into supply
layers. Since you're not running any traces through those layers then
you can use this option.
Using the DISPLAY command select your inner layers and using the change
button you can set them to supply layers. Remeber that these are
negative layers so if you route any tracks on them they will be removed.
If you don't want the autorouter to touch those layers you can turn them
off on the autorouter setup the first tab. Where you see the layer
preferred directions you can set the layer to N/A not available and the
autorouter won't route to it.
If you just want the vias placed and routed then you can use this little
trick. First Disable your optimize runs, then set your via cost to zero,
and finally type 9999 in the field that allows you to limit the number
of vias per connection.
When you run the autorouter EAGLE will automatically run vias near all
ground and power pins.
hth,
Jorge Garcia
Cadsoft Computer
On 5/26/2010 7:22 AM, Tony wrote:
I have a 4 layer design with power and ground filling both internal
layers with no internal routing just vias. I want to set up a
restriction to prevent the power plane filling an area. How do I set up
the internal restriction?
if I understand your question correctly, you want some areas with no
fill, open in other words, on your internal planes.
if this is the case, use polygons on the inner layers to make the planes
and simply don't draw them over the areas where you want it to be open.
Tony wrote:
I have a 4 layer design with power and ground filling both internal layers
with no internal routing just vias. I want to set up a restriction to
prevent the power plane filling an area. How do I set up the internal
restriction?
Besides using multiple polygons to cover the area (as Gary already
suggested), have a look at the attached board file for an alternative.
Also a closed wire frame will keep the polygon pour out of it's area.
--
Lorenz