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Discussion of GDS format
Web data books
The cell layout is provided in GDS format in a file written from Magic. It can be viewed using Alliance Dreal. A README file in the cell directory can be sourced to set up the environment variables properly.
cd pharosc/magic/gds/vsclib013 source ./README
The REF layers which define the hit points for the place and route software are missing from the GDS file. This is because they are not present in the Magic file because they are not a real physical layer.
The GDS layer mapping is shown below.
PWELL 41 P well NWELL 42 N well NDIF 3 N diffusion inside P well PDIF 4 P diffusion inside N well NTIE 5 N diffusion inside N well PTIE 6 P diffusion inside P well ACTIV 43 All diffusion layers PIMP 44 P implant NIMP 45 N implant POLY 46 Polysilicon for gate and interconnect CONT 25 Contact Metal-1 to poly and diffusion ALU1 49 Metal-1 VIA1 50 Via Metal-1 to Metal-2 ALU2 51 Metal-2 VIA2 61 Via Metal-2 to Metal-3 ALU3 62 Metal-3 VIA3 30 Via Metal-3 to Metal-4 ALU4 31 Metal-4 VIA4 32 Via Metal-4 to Metal-5 ALU5 33 Metal-5 VIA5 36 Via Metal-5 to Metal-6 ALU6 37 Metal-6
Example of GDS cell showing the separate N and P diffusion layers.
Example of GDS cell showing a single diffusion layer and separate N and P implant layers.