Hi , i see two different layers as below : but they are for the same nfet - what is the use case for these two ? the generated devices from magic use the nfet one. When should one use the other one ? Thanks # sky130_fd_pr__nfet_01v8 nfet standard nFET # sky130_fd_pr__nfet_01v8 scnfet standard nFET in standard cell**

SkyWater has some DRC rule exceptions for FETs in standard cells that do not apply to FETs in general. There is a standard cell marker layer that identifies standard cells that activates these DRC rule exceptions.