Exporting GDS
To export GDS, you can go to File->Export->Stream... in the CIW.
In the new window that opens up, specify a stream file (for example, mult.gds). Select the technology library (NCSU_techlib_tsmc02d). Select YOUR library, top level cell and "layout" as the view.
Click on "Options". The first page should show an option "Translate Entire Hier". Check that or else it will only have shapes at the top level!
Now you need to set up the layer map. Save this to a file called "cmpe222layermap":
# Layer map for converting from GDSII to Cadence format (SCMOS processes) # Cadence layer Cadence layer purpose GDSII layer # ------------- --------------------- ----------- nwell drawing 42 0 pwell drawing 41 0 pactive drawing 1 0 nactive drawing 2 0 active drawing 43 0 tactive drawing 60 0 nselect drawing 45 0 pselect drawing 44 0 poly drawing 46 0 poly pin 46 0 metal1 pin 49 0 metal2 pin 51 0 metal3 pin 62 0 metal4 pin 31 0 metal5 pin 33 0 metal6 pin 37 0 metal1 drawing 49 0 metal2 drawing 51 0 metal3 drawing 62 0 metal4 drawing 31 0 metal5 drawing 33 0 metal6 drawing 37 0 cc drawing 25 0 cc drawing 47 0 cc drawing 48 0 cc drawing 55 0 via drawing 50 0 via2 drawing 61 0 via3 drawing 30 0 via4 drawing 32 0 via5 drawing 36 0 glass drawing 52 0 pad drawing 26 0 sblock drawing 29 0 metalcap drawing 35 0 text drawing 99 0
Click on the "Layers" tab. Click on "Load File" and select the file. Click on OK.
Click on "Translate". You will see 8 ERRORs about "Failed to create the new layer purpose pair...", but we are not using those layers so it is ok. You can verify the shapes that were exported by looking at the "strmOut.log" in your directory. It looks like this:
Summary of Objects Translated: Scalar Instances: 7 Array Instances: 0 Polygons: 0 Paths: 0 Rectangles: 57 Lines: 0 Arcs: 0 Donuts: 0 Dots: 0 Ellipses: 0 Boundaries: 0 Area Blockages: 0 Layer Blockages: 0 Area Halos: 0 Markers: 0 Rows: 0 Standard Vias: 0 Custom Vias: 0 Pathsegs: 0 Text: 0 Cells: 7
Turn in the GDS file. NAME THE FILE THE SAME AS YOUR TOP LEVEL CELL OR I CANNOT OPEN IT!! If your top design is "mult" name it mult.gds. Case matters.
You can check that your file exported correctly by:
- create a new library but do not attach a technology file
- File->Import->Stream...
- specify the gds file to translate
- specifying the correct "top level" cell
- specify the same layer map as before
- Verify in the strmIn.log that the numbers of shapes match the above strmOut.log.
If you start over, you will have to delete and re-create the library, because otherwise you get an error that a technology library is already attached.
In order to view the layout, you need to set up the display resources properly. This seems to work for me automatically... sometimes.
