Support for MEOL layer?

[GuzTech]

Hello everyone!

I'm in the process of bringing up a new platform which is going well. I am running into a problem with a local interconnect layer which is specified as a MASTERSLICE with LEF58_TYPE = MEOL, so it is not specified as a ROUTING layer as is the case with the sky130 PDK. OpenDB complains that there is a parse mismatch for this lil layer.

If I add this lil layer as a routing layer to make_tracks.tcl then OpenDB complains that it is not a routing layer. If I don't add lil as a routing layer, then TritonRoute gives an error that it cannot find layer lil for viarule that connects lil to the first metal layer.

Did anyone else run into a similar problem? If so, how did you solve it?

[maliberty]

Please include the odb message. You should not add tracks if it is not a routing layer.

[GuzTech]

If I don't specify the lil layer as a routing layer then OpenDB gives me the following warning:

[WARNING ODB-0279] parse mismatch in layer property LEF58_TYPE for layer lil : "MEOL"

The section in the LEF file looks like this:

LAYER lil
	TYPE MASTERSLICE;
	PROPERTY LEF58_TYPE "TYPE MEOL;";
END lil

But then TritonRoute gives me an error:

[ERROR DRT-0129] Unknown layer lil for viarule lil_m1.

The part in the LEF file:

VIARULE lil_m1 GENERATE 
	LAYER lil;
		XXX
	LAYER m1;
		XXX
	LAYER ctc;
		XXX
END lil_m1 

where the ctc layer is of type CUT.

[maliberty]

We need to add support for MEOL. You can workaround it my making it a masterslice layer temporarily.

[maliberty]

Opened #1872

[GuzTech]

Which layer do you mean exactly? lil is already a masterslice and ctc is a cut layer.