Netlist Analyzer Guide

• Overview
• Pre-requisites
• Demonstration
  • Open Netlist Analyzer
  • Check Analyze Parameters
  • Current Netlist
  • CAD Netlist
  • Undefined Net Name
  • Run Netlist Compare
  • Check Results
  • Short Sample
    • Short
  • Broken Sample
    • Broken
• Netlist Analyzer Configuration

Overview

• Netlist Analyzer is used to create a netlist and compare it with original layout, it detects possible open/short errors to make sure correct net connections after editing

Pre-requisites

• Matrix setting for layers must be completed( Gerber274X Layer and Profile Set Up )
• Drill hole start and end layer must be assigned ( Gerber274X Layer and Profile Set Up )

ODB++ file format is able to run netlist analyzer without additional setup

Demonstration

Open Netlist Analyzer

• From Graphic Editor window, select Actions > Netlist Analyzer。

Check Analyze Parameters

Set up Job, Step and Netlist Type for analyzation

• Fill in upper fields on Job, Step, Netlist type, in the demonstration " CAD " was selected as original layer
• Fill in lower fields on Job, Step, Netlist type, in the demonstration " Current " was selected as edited layer

Note：drill holes without assigned attribute will be given PTH attribute (.drill=plated) by default

• Tips：Use " Register " > " Reduce To Center ", to align two layers when running netlist analyzer

Current Netlist

• Create netlist based on current Step layout
• ＄NPTH＄[number] : A serial number will be given to each NPTH holes in the layout for distinction

CAD Netlist

• Netlist created by input Gerber IPC-356A or ODB++ file format

Undefined Net Name

If source CAD file has undefined net name，ezCAM will assign the net as $NONE$[serial number] for distinction

Run Netlist Compare

• Click " Compare " button to run

Check Results

Analyse Result will be shown in four category：

• Shorted: short cause by unwanted connection of two nets
• Broken: Net broken because of layout errors
• Missing: Missing net point
• Extra : extra net point

Compare result: Short Sample

Short

Command：netlist_control

• Click on the comparison result entry to zoom in on the layout, hold ctrl and click to select multiple entries

As shown in picture below: Green net and red net are connected and will result in shortage

Compare result: Broken Sample

Broken

• Click on the comparison result entry to zoom in on the layout, hold ctrl and click to select multiple entries

As shown in picture below: the highlight line feature is broken

Netlist Analyzer Configuration

Configuration

• iol ipc356 a default rad（2mil）: If IPC-356A file did not specify test point size, use this value as test point size
• net compare inner_point（no）：option to compare inner layer test points, most input CAD file does not contain inner data and cause Missing/Extra reports，Default setting is no
• net filter short broken options（3）：0-None, 1-Ignore names, 2-Cad problems, 3-Both，Set filter for Short and Broken reports.
• net minimun net point size（0.5mil）：For current netlist, test point will not be created for pad with size smaller than input value. c
• net names to_ignore for compare（$NONE$）：Ignore in compare result if the net name equals to entered name here
• net points radius after reduce to center（2mil）：Use entered value for CAD/Reference Reduce to Center test point size
• net report missing_extra（no）：Display Missing/Extra in the report