Routing Trace gap

Hi, On your question are you trying to route a trace that is 300uM away from a plane or are you trying to route the trace that is 300uM away from the edge of the board ?

Your picture is showing shapes with a trace going through them so I am unclear as to exactly you are wanting to do, maybe put it another way ?.

In the CM it may be easier to set the clearances you need based on the physical net as a starting point for those 5 nets. If there is a shape or ground plane between them then you would be looking at
setting the Shape to line spacing for the particular net.

All the best. 

Hello, sorry for the confusion. The trace has a 100um gap from line to shape but then I need to have enough space at the top of the trace to be 300um. I was wondering if there was some way to create a clearance in the CM to create that 300um clearance? 

Hi Rafa

I think the picture is not showing where exactly you are needing to have that 300uM Gap. Looking at the picture from the bottom to top you have a shape then a trace then a shape again. The distance between the trace and the shape is 100um. Can you post a better picture showing where you need that 300uM gap ?

What is confusing is that you say you need to have a 300uM gap at the top of the trace but there is a shape there that looks to be 100uM away from the trace. I am sure there is a way to do what you need but more info would be helpful.

Thanks.

Hi excellon,

I hope this explains it better. In the pictures below I start with a shape with set dimensions already. On the second picture I have 2 thicker traces at the top and bottom that need 300um of gnd in the red circles to insert vias in between. I am able to create spacing rules for trace to trace which helps with the gaps between the traces but the very top portion in the red circle is a problem. I can't seem to find a way to create a set gap for the trace and the edge of the board to make it consistently 300um. The shape gets more complex as I route to the left so I'm trying to keep that area 300um all the way to the end. Hope this helps!

So to help with this the first thing is you need a board outline, I assume you have this. Inside the board outline create a route keepin all with a shape on the route keepin class.subclass.
Make this shape 300um away from the board outline.

Here is a pic.

The grey rectangle is the "Keepin" Basically this keeps all routes etc a certain distance from the edge of the board.

The next pic shows what happens when I add a shape that extends beyond the board outline.

Notice that the copper does not extend beyond that keepin. I think this should resolve keeping the shape a set distance from the edge of the board.

The other thing to consider is the actual traces. You want to have a rule that keeps the traces a certain distance away from the shape. This can be done on a net basis with the CM using the
"Spacing constraint set" > NET > Line to shape spacing. In here you can set a distance how far you want a line away from a shape.

You can also use the global rules for a shape instead of setting a net rule. Normally each shape has certain default clearances that are defined in the CM under "Spacing constraint set"
all layers.

When you pour the shape use a "Dynamic Shape" and assign it a net.

I think the best method to do what you need is put your traces/clines in first then pour a dynamic shape and assign it to a net "GND"

One thing, You mention you want to put vias on that 300um copper strip above the traces. 300um = 11.81 mil. This is fairly small. Typically if you use a mechanical drill the smallest hole size is about 6mil which should be do-able, but you don't have much margin for breakout 3mil !!!, Possibly you may need to resort to a laser drill hole to make the hole smaller.

There is also another way to route this not using shapes. Assuming the shape has a net of gnd you could route the 2 traces and the gnd net all at the same time but doing so is a little less
flexible than using shapes for the gnd.

All the best.