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  

 

WIRES

Wires are a bit complicated because they are conductors but have unique properties due to their 3D path. Since the input design data generally only knows about the start and the end of the wires the job file contains only this information.

Farther down the simulation process the wires are converted to full 3D entities. Generally this is done by using a wire model that uses 3 or 4 parameters. Wires of similar length tend to share the same parameters and we group wires that share the same 3D parameters into groups called tiers.

The concept of a layer for wires still applies since the internal architecture of NETEX has to find conductivity based on the wire start and end point. Hence it is forbidden that any wires on a common layer cross in the XY plane. Each TIER must correspond to a WIRE stackup layer in the stackup section.

Note that Wires are not listed directly like a conductor layer but rather brought in through a special routine. That's because we don't look at the wire as a conductor trace but only at its endpoints since it "flys" through the air.

In the NJB file the wire section looks as follows:

B_WIRES
TIER   W1           1    0.025000     3
-1.545000    1.039000     -4.318000    3.706000
-1.545000    0.925000     -4.356000    3.473000
-1.545000    0.811000     -4.392000    3.245000
-1.545000    0.697000     -4.428000    3.021000
-1.545000    0.600000     -4.463000    2.800000
.
.
TIER   W2           2    0.025000     3
-1.460000    0.565000     -4.498000    2.583000
-1.460000    0.475000     -4.531000    2.369000
-1.460000    0.320000     -4.628000    1.739000
-1.460000    0.240000     -4.690000    1.327000
-1.460000    0.160000     -4.749000    0.919000
.
.
E_WIRES

Line 1 - must begin with B_WIRES.

Line 2 - TIER classification.

    The first item is the key word TIER

    the second item is the Tier designation (string, no spaces)

    the third item is the stackup layer for this wire

    the fourth item is the wire diameter

    the fifth item is the stackup for the attach layer (must be a metal layer below the wire layer)

Line 3 - each line consists of two X,Y pairs. By convention, the first pair of coordinates is on the die side and the second pair of coordinates is on the finger or ring side.



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