<magma talus> how to allocate each routing layer cost?

[chris_li]

Hi Guys, anyone who know how to allocate routing layer cost in Talus? I mean, I found lower layers like Metal1, Metal2 has heavy cost (probably timing concern by inter-connect thru lower layer) while higher layer has an even low utilization. It causes lower layer congestion and quite more DRC violations. I intended to push routing towards higher layer, but I do know how to do? Who can help?

 

[huckle]

You could allocate layer costs if you were in Magma R&D I don't see it controllable from user side.

 

[huckle]

You may want to see what two layers are specified as your clock preferred layers (M3/M4 or M4/M5 or M5/M6), higher is better, that can help to some extent.

Regards,

 

[jeevan.life]

You can set your lower and top level metals to be used for your routing. You can use "force model routing layer" to specify the same.