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The Gerber Layer Format Specification 2021.02

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The Gerber Layer Format Specification 2021.02 . The Gerber Layer Format Specification A format developed by Ucamco Revision 2021.02 Contents Contents ........................................................................................................................ 2 Preface ........................................................................................................................... 7 1 Introduction .............................................................................................................. 8 1.1 Scope and Target Audience ................................................................................ 8 1.2 Further Resources .............................................................................................. 8 1.3 Reference Gerber Viewer ................................................................................... 8 1.4 Copyright and Intellectual Property ..................................................................... 9 2 Overview ................................................................................................................. 10 2.1 File Structure ..................................................................................................... 10 2.2 Apertures ........................................................................................................... 10 2.3 Graphical objects .............................................................................................. 11 2.4 Draws and Arcs ................................................................................................. 12 2.5 Operations (D01, D02, D03) ............................................................................. 13 2.6 Graphics State .................................................................................................. 14 2.7 Polarity .............................................................................................................. 16 2.8 Blocks ................................................................................................................ 17 2.9 Attributes ........................................................................................................... 17 2.10 Commands Overview ..................................................................................... 18 2.11 Processing a Gerber File ................................................................................ 19 2.12 Glossary .......................................................................................................... 21 2.13 Annotated Example Files ................................................................................ 24 Example: Two Square Boxes ................................................................... 24 Example: Polarities and Apertures ........................................................... 26 2.14 Conformance .................................................................................................. 30 3 Syntax ..................................................................................................................... 31 3.1 Character Set .................................................................................................... 31 3.2 Grammar Syntax ............................................................................................... 31 3.3 Commands ........................................................................................................ 33 3.4 Data Types ........................................................................................................ 35 Integers ...................................................................................................... 35 Decimals ..................................................................................................... 35 Strings ........................................................................................................ 35 Fields .......................................................................................................... 36 Names ........................................................................................................ 36 3.5 Full Grammar of the Gerber Format .................................................................. 37 Copyright Ucamco NV 2 Having a question or remark about the spec? Please contact us at [email protected] 3.6 File Extension, MIME Type and UTI ................................................................. 43 4 Graphics.................................................................................................................. 44 4.1 Comment (G04) ................................................................................................ 44 4.2 Coordinate Commands ..................................................................................... 45 Unit (MO) .................................................................................................... 45 Format Specification (FS) ........................................................................... 46 4.3 Aperture Definition (AD) .................................................................................... 47 AD Command ............................................................................................. 47 Zero-size Apertures .................................................................................... 48 Examples .................................................................................................... 48 4.4 Standard Aperture Templates ........................................................................... 49 Overview..................................................................................................... 49 Circle .......................................................................................................... 49 Rectangle ................................................................................................... 51 Obround ..................................................................................................... 52 Polygon ...................................................................................................... 53 Transparency of Holes ............................................................................... 54 4.5 Aperture Macro (AM) ......................................................................................... 55 Primitives .................................................................................................... 57 Exposure Parameter................................................................................... 66 Rotation Parameter .................................................................................... 67 Macro Variables and Expressions .............................................................. 68 Examples .................................................................................................... 69 4.6 Set Current Aperture (Dnn) ............................................................................... 73 4.7 Interpolation State Commands (G01,G02,G03,G75) ........................................ 74 Linear Interpolation (G01)........................................................................... 74 Circular Interpolation (G02, G03, G75) ....................................................... 75 4.8 Operations (D01/D02/D03) ............................................................................... 79 Overview..................................................................................................... 79 Interpolate (D01)......................................................................................... 81 Move (D02) ................................................................................................. 81 Flash (D03) ................................................................................................. 81 Example ..................................................................................................... 82 4.9 Aperture Transformations (LP, LM, LR, LS) ...................................................... 83 Overview..................................................................................................... 83 Load Polarity (LP) ....................................................................................... 85 Load Mirroring (LM) .................................................................................... 85 Load Rotation (LR) ..................................................................................... 85 Load Scaling (LS) ....................................................................................... 86 Examples .................................................................................................... 86 4.10 Region Statement (G36/G37) ......................................................................... 89 Region Overview ...................................................................................... 89 Region Statement Syntax ......................................................................... 90 Copyright Ucamco NV 3 Having a question or remark about the spec? Please contact us at [email protected] Valid Contours .......................................................................................... 90 Examples .................................................................................................. 92 Power and Ground Planes ..................................................................... 108 4.11 Block Aperture (AB) .....................................................................................
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