protel 99 se pcb ascii file format reference文档.pdfVIP

Protel 99 SE PCB ASCII File Format Reference Copyright (c) 2000, Protel International Limited. INTRODUCTION 3 THE STRUCTURE OF A PCB ASCII FILE 4 Units used in this document 5 DEFAULTS SECTION 6 Board Object 6 Output Options 8 Printer Options 9 Gerber Options 11 Advanced Placer Options 12 Design Rule Checker Options 13 Classes 14 PCB OBJECTS SECTION 15 Net objects 15 Component Objects 16 Polygon Objects 17 Dimension Objects 18 Coordinate Objects 19 Rule Objects 20 Connection Objects 28 Embedded Objects 29 Arc Objects 30 Pad objects 31 Via Objects 32 Track Objects 33 Text Objects 34 Fill Objects 35 From-To Objects 36 2 Introduction The Design Explorer 99 SE’s PCB editor provides different file format options when saving Protel PCB documents. The default binary format generates a compact database, which loads and saves PCB data efficiently. PCB documents are also saved in a Protel ASCII text format. In this document, the ASCII PCB file format for Protel PCB 99 SE will only be documented. The PCB editor uses a 32 bit design database and can generate through hole and SMD designs of up to 32 signal layers, plus 16 mid layer power planes. There are 16 mechanical drawing layers which allow you to generate fabrication and assembly drawings for your design. The boards can be as big as 100 inches by 100 inches. The Placement accuracy on the 0.001 mils grid system is ±0.0005 mils. Prior to the Design Explorer 99SE, there were up to 16 signal layers, 4 mid layer power planes and 4 mechanical drawing layers. Signal layers There are 32 signal layers that can be used for track placement. A