view_gds.py update

docs/VLSI/Tutorial.rst

@@ -44,7 +44,7 @@ This example gives a suggested file structure and build system. The ``vlsi/`` fo
 
 * view_gds.py
 
-  * A convenience script to view a layout using gdstk or gdspy. Note that this will be very slow for large layouts (e.g. a Rocket core)!
+  * A convenience script to view a layout using gdstk or gdspy. Only use this for small layouts (i.e. smaller than the TinyRocketConfig example) since the gdstk-produced SVG will be too big and gdspy's GUI is very slow for large layouts!
 
 Prerequisites
 -------------

vlsi/view_gds.py

@@ -4,17 +4,16 @@ import sys, os, subprocess
 
 print('Loading GDS...')
 
-#try:
-#    # gdstk created SVG
-#    import gdstk
-#except ImportError:
-#    try:
-#        import gdspy
-#        import tkinter
-#    except ImportError:
-#        print('Bad gdspy (requires tkinter) installation!')
-#        sys.exit()
-import gdspy
+try:
+    # gdstk created SVG
+    import gdstk
+except ImportError:
+    try:
+        import gdspy
+        import tkinter
+    except ImportError:
+        print('Bad gdspy (requires tkinter) installation!')
+        sys.exit()
 
 if 'gdstk' in sys.modules:
     svg_file = os.path.splitext(str(sys.argv[1]))[0] + '.svg'