ASM 3500 DXF to GDSII Bidirectional Translator

DXF to GDSII

DXF Entity GDSII Entity Comment

Line: not part of a boundary

Path

GDSII supports a maximum of 200 vertices per trace definition. An error will be generated if the line has more than 200 vertices

Arc: not part of a boundary

Path

GDSII has no arc entity. Arcs are broken into vectors using the ARCRES parameter in GDS.CFG file.

Lines and arcs that form a closed boundary

Boundary

ACAD2GDS attempts to form closed boundaries from lines and arcs whenever possible. Arcs are first broken into vectors using the ARCRES resolution parameter, then linked. Note that GDSII has a 200 vertices per boundary limitation but that many programs support more than 200 vertices. ASM 3500 allows the user to set the max number of vertices to 8192.

Circle

Boundary

Resolution determined by ARCRES parameter and the ARCSAG parameter.

Polyline (constant width)

Path

ACAD2GDS checks to see if the polyline has constant width. If so, it translated into a path. If not, it is translated into a boundary

Hatching

Ignored

Not supported in GDSII

Insert¹

Structure Reference

Inserts may be nested 32 deep

Layer²

Layer

GDSII supports layers 0-63. The user can control layer name to number mapping or let the program do this automatically. Many programs support more than layers 0-63. ASM 3500 allows you to define a max layer up to 1024.

Minsert

Array reference (AREF)

 

Point

Ignored

there is no GDSII equivalent.

Solid

Boundary

watch out for Bow-Tie solids which are illegal boundaries.

Ellipse

Boundary

 

Polyline of non constant width or incorporating arc sections

Boundary

ACAD2GDS will calculate the outline of the polyline and translate to a GDSII boundary.

Text

Text

Text size, mirroring, and rotation are supported. Slant and width parameters are ignored. Font data is ignored--mapped to FONT in GDSII

Notes:

1. The block attributes are not passed. GDSII does not support the concept of layer associated to the insertion; all inserts in GDSII belong to layer 0.
2. Certain layer attributes such as color and linetype are not part of the stream file definition and are ignored.

GDSII to DXF

   
GDSII Entity DXF Entity Comment

Path

Polyline of appropriate width

Support 1/2W extension attribute. Does not support semicircular extension attribute. User can force paths with width into zero width closed plines in DXF.

Boundary

Zero width closed polyline

 

Data Type

Ignored

no equivalent in DXF

SREF

>

Block Insert

 

AREF

Block Minsert

 

Text

Text

Font is AutoCAD TXT

Layers

Layers

GDSII has layers 0-63. User can create his own layer name table for AutoCAD or can let the program use layer numbers.

Box

Zero width closed polyline

 

Plex

Entity Data

Plexes are structures with certain elements marked for insertion into the top layer.



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