Find the overlapping shapes between three layers

Hi,

You should definitely have a look at Cadence Advanced Boolean Engine [ABE] documentation

This is meant to extract all shapes from a layer through a layout hierarchy and efficiently run boolean operations on it

The functions you need are:

abeInit, abeLayerFromCellview, abeLayerAnd, abeLayerToCellView, abeLayerToHilightSet and abeDone

Cheers,

Aurélien

Hello Aurélien,

Thank you for your response!

I have used abeLayerToCellView function as well, but in the output layer I am seeing that the AND operation is breaking the overlapping shapes into smaller rectangles. Is that behavior expected? I will try to share an illustration as well.

Also, will check out the abeLayerToHilightSet function.

Thanks,

Anmol

I think the post below might possibly explain why the shapes are splitting into multiple smaller rectangles.

Number of Points for a shape cannot more than 4000 - Custom IC SKILL - Cadence Technology Forums - Cadence Community

Although not sure why the resulting polygons from AND for above layers could have >4000 points.

Pass ?tiles nil to the abeLayerToCellView() function. The default is that it outputs the individual tiles otherwise.

Pass ?tiles nil to the abeLayerToCellView() function. The default is that it outputs the individual tiles otherwise.

Hi Andrew, 

Thank you for your response!

I got to try this now, as I got stuck with some other higher priority work.

By passing ?tiles nil to the abeLayerToCellView() function, I am getting the following output:

Output without ?tiles nil is as shown below:

The required output is something like this:

Could you please suggest if there is something else that I can try to get this required output?

Any help her would be really appreciated.

Thanks,

Anmol

Hi Anmol,

Without seeing the data, I can't comment on why the results are the way they are (I'm assuming there are small gaps in the regions where some of the lines are shown). I'm also not sure why it should produce a shape like you've suggested (given that there's no fill in the layers you're drawing it's impossible to see where the solid areas are).

I suggest you contact customer support so somebody can see your actual data. There's not going to be a magic switch to produce what you want - but maybe some additional processing can get there (as I said, I can't guess what the data actually looks like from your pictures).

Andrew

Hello Andrew, 

This is what the data looks like with fill:

Thanks

Anmol

OK, so presumably there are small gaps between the regions you've drawn (otherwise it would have merged into a single polygon - feasible because the vertex count is not too high). I presume that there are also small gaps in the original (non-tiled) output of the abeLayer results too - and it's not clear why you think it should be able to end up with the result above (again, I can't see the detail from the pictures).

Andrew