NETEX-G Topics

Overview
• Introduction
• Applications
• User Interface
 
Inputs
• Gerber File Requirements
• Vias from Drill Data
• Layer Stackup
• Wire Bond Data
 
Assigning Nets and Nodes
• From ASCII Table
• From AIF
• From IPC356
• From GBRVU

Outputs
• ASCII Output
• Ansoft ANF
• Geometry Options
• GDSII
• DXF
 
Proximity Effect
• What is a Proximity Net?
• What is a Neighbor Net?
 
 
Extractions
• Extracting Nets
 
 
Netex Engine
• Program Flow
• Job File Syntax
• Command Line Syntax
• drl2gbr engine
• generating wire coords  

 

GDSII Stream Output

Netex-G can write out a GDSII stream file that is organized by net. (this may require a separate license option.) The GDSII file has the following properties:

  • All entities are boundaries

  • All boundaries belonging to a net are aggregated into a structure whose name is the net name. This makes is very easy to pick out individual nets.


Why is this GDSII file useful? Our customers have given us two reasons:

  • A silicon designer can bring this GDSII file (it includes node labels) into his design environment and run a complete LVS from chip to the bottom of the package. This is a good check against a package that may have a design error (or design intent error) in it.

  • Even if you are not a chip designer, the GDSII file combined with Artwork's Qckvu3 viewer makes is very easy to view each net -- there are times when this is quite valuable.


Additional Features and Functions


Wirebond Handling

Bond wires can be treated as paths but care has to be taken to avoid wire crossing and to provide a vertical connection from the wire end to the metal pad. The wirebonding page explains in detail how this works.


Net Annotations

How NETEX-G uses the GDSII PROPERTY record to annotate net names to geometric entities.

 

Layer Mapping

How to control mapping of layers from Gerber/ODB to GDSII layer:datatype.


Node Text

How NETEX-G creates text entities used to label component pin (nodes) locations. This can be useful when analyzing a files nets and connections.


Fracturing

Some tools cannot properly support complex polygons that are often generated from package layout. This option fractures the GDSII output into trapezoids.

 


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