Contents

Overview
• Introduction
• Applications
• Input
• Outputs
    GDSII
    Ansoft ANF
    Optimal XFL
    OEA Netan
 
Running NETEX
• command syntax
 
Proximity Nets
• What is a Proximity Net?
• Why Would I Need It?
• How it Works
 
When Net Names Collide
• Different Net Names
   on Same Conductor

• Separate Conductors
   with Same Net Name

• Log file reporting
 
Layers and Datatypes
• What is a GDSII Datatype?
• How to Separate Entities
   by Datatype
 
The Technology File
• Conductor Stackup
• Assigning Net and Node
   Names using Text Layers

• Conductor Name Mapping
 
The Configuration File
• Data Units
• Expansion
• Output Directory
• Temporary Directory
• Extraction Directives
     • All
     • Bycoordinate
     • ByName
 
Saving Intermediate Results
• The GDSII file with all nets
• How Last State is Saved
 
 

Introduction

For a variety of reasons, designers would like to take a large GDSII stream file, and identify and extract all of the metal associated with a particular net or group of nets. Members of the net should be generated by detecting touching or overlapping metal, poly and vias to build connectivity. GDSII files routinely have multiple layers of metal; metal layers are interconnected vertically by vias; small rectangular "openings" in the insulation between the metal layers. Poly layers are also considered to be conductors and these can be treated in a similar fashion to metal layers.

ic image

Artwork's NETEX program uses boolean geometry to collect connected polygons and paths into an "electrically" connected set. In addition to the actual GDSII file, NETEX requires a technology file that defines the "stackup" i.e. the conductor and via order.



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