Hi guys, I have worked through both tutorials supplied with the alliance tools. I used the "make" procedure for the amd2901 demo. All progressed smoothly until i tried to view the layout using dreal. The message: "cif109: Layer unknown, line 11" appears and dreal cannot open the file. I reset the environment variables to point to my own technology file and the gds output format. I invoked s2r hoping to get a gds file of the amd2901 processor. Instead, s2r quit, complaining that it was unable to open file "padreal." I had the same experience trying to use s2r with the addaccu demo. Does it matter that there is no "ring" library that I see mentioned in the documentation? Cell "padreal.ap" and "padreal.cif" are actually in padlib. I tried to use s2r to create a gds version of padreal. That didn't work either. What's going on? Thanks for your help. Ken Spicer spicer@atmel.com