Or could I tell openlane an overlap strategy that it should

Question

Or could I tell openlane an overlap strategy that it should move remove TAP cells when they overlap with a cell

htamas · Answer

Are you using `sky130 fd sc hd` Using the default settings you should have a gap of 25 08 microns between adjacent tap cells in a row and the widest standard cell is 16 56 microns wide Also clkbuf 2 is quite narrow 1 84 microns in width

Philipp Gühring · Answer

No hd is too dense for my generator I switched to sky130 fd sc ls My own CLKBUF2 is 18 72 microns wide

Philipp Gühring · Answer

It seems like this particular cell could be layouted in a smaller way but I would also like to have more complex standard cells in the future which will need more space

Philipp Gühring · Answer

Hmm it s a 24 transistor CLKBUF2 cell

htamas · Answer

16 56 microns should still fit Check your floorplan i e openlane lt design gt runs lt design gt results floorplan user project floorplan def

htamas · Answer

You might also increase `FP TAPCELL DIST` as long as you stay within the DRC

Philipp Gühring · Answer

I think the DRC rule was something like 12 microns maximum distance so I guess 22 microns might be the maximum usable for FP TAPCELL DIST

htamas · Answer

I have a default `FP TAPCELL DIST` of 13 which gives a somewhat less than 26 for usable space 25 08 actually

Philipp Gühring · Answer

Is there a viewer for the user project floorplan def which can show the positions of the cells The def file is missing the width s and height s of the cells and because of that I can only see the IO pads at the top and the bottom

htamas · Answer

Recent versions of klayout can open these def files directly Older versions can import them via `File gt Import gt DEF LEF`

Philipp Gühring · Answer

Both klayout and magic are only showing the IO pads

htamas · Answer

If you expand the cell list in klayout s cell panel do you see the tap cell name there