When I use openlane2 to synthesize DFFRAM. I have assigned power and ground pins to the macro inside the DFFRAM code. I edited the config to recompile DFFRAM. But when running it gets error: [WARNING PSM-0038] Unconnected PDN node on net VPWR at location (-4.840um, 31.280um), layer: met5. Please help me

The DFFRAM is a hard macro, right? What’s the max routing layer in your DFFRAM?

DFFRAM is a hard macro of my design. The max routing layer in your DFFRAM is 4 and when i changed it is 5, i receive error: [ERROR PSM-0078] IR drop setup failed. Analysis can't proceed.

The max routing layer in your macros should be one metal layer lower than the block where it is instantiated.